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________________________________________________________________ _ maxim integrated products _ _ 1 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai 19-4921; rev 0; 3/10 typical operating circuit appears at end of data sheet. general description the MAX8930 integrates a charge pump for white led display backlighting with ambient light control (alc) feature. the high-efficiency, adaptive-mode 1x/-0.5x charge pump drives up to 11 leds (8 wleds + rgb led) with constant current for uniform brightness. the led current is adjustable from 0.1ma to 25.6ma in 256 linear steps through i 2 c. high accuracy and led-to-led current matching are maintained throughout the adjust - ment range. the MAX8930 includes soft-start, thermal shutdown, open-circuit, and short-circuit protection. three 200ma ldos are provided with programmable output voltages to provide power to external circuitry. these three ldos can also be configured for a gpo function through the i 2 c. a step-up converter is also available on the MAX8930 for biasing a pmoled sub - panel. the MAX8930 is available in the 49-bump, 3.17mm x 3.17mm wlp package. features s white_ led_ charge_ pump s adaptive_ 1x_ or_ -0.5x_ negative_ modes s 11_ low-dropout_ led_ current_ sinks_ with_ 25.6ma_ to_ 0.1ma_ in_ 256_ dimming_ steps s ramp-up/down_ control_ for_ main_ white_ led s ramp-up/down_ control_ for_ rgb_ led s individual_ brightness_ control_ for_ each_ white,_ rgb_ led s low_ 240a_ (typ)_ quiescent_ current s ambient_ light_ control_ (alc)_ for_ any_ type_ of_ light_ sensor s content_ adaptive_ interface s i 2 c-compatible_ control_ interface s three_ programmable_ ldos_ up_ to_ 200ma s step-up_ dc-dc_ converter_ with_ programmable_ output_ for_ pmoled_ application s low_ 0.1a_ shutdown_ current s 2.7v_ to_ 5.5v_ supply_ voltage_ range s thermal_ shutdown s open_ and_ short-circuit_ protection applications cell phones and smartphones pdas, digital cameras, camcorders, and other portable equipment ordering information + denotes a lead(pb)-free/rohs-compliant package. simplified application circuit evaluation_kit available part temp_ range pin-package MAX8930ewj+ -40 n c to +85 n c 49 wlp 0.4mm pitch p input 1.7v to 5.5v input 2.7v to 5.5v pv4 pv5 pv1 pv2 pv3 wled1 input wled2 wled3 wled4 wled5 wled6 wled7 wled8 scl sda en cai playr playg playb refbp v dd filt sense light sensor bias rled gled bled chg ldo1 2.3v to 3.1v, 200ma 2.3v to 3.1v, 200ma 1.2v, 1.5v, 1.8v, 2.5v, 200ma 13v to 16.5v ldo2 ldo3 out key input MAX8930
2 _ _ _______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. pv_, v dd, en, cai, play_, bias, sense, refbp, ecagnd to agnd ................. -0.3v to +6.0v pv_, v dd , pgnd_, agnd to neg ....................... -0.3v to +6.0v ecagnd, pgnd_ to agnd ................................. -0.3v to +0.3v wled_, rgb_, c1n, c2n, c1p, c2p to neg ......... -0.3v to (v pv1 + v pv2 + v pv3 + 0.3v) filt to agnd .......................................... -0.3v to (v pv3 + 0.3v) scl, sda to agnd .................................. -0.3v to (v dd + 0.3v) ldo_ to agnd ............................ -0.3v to (v pv3 + v pv4 + 0.3v) sw to pgnd3 .......................................... -0.3v to (v pv5 + 0.3v) lx, out to pgnd3 ............................................... -0.3v to +22v key to agnd ........................................... -0.3v to (v pv3 + 0.3v) continuous power dissipation (t a = +70 n c) 49-pin wlp 3.17mm x 3.17mm (derate 20mw/ n c above +70 n c) ................................ 1600mw operating temperature range .......................... -40 n c to +85 n c junction temperature ..................................................... +150 n c storage temperature range ............................ -65 n c to +150 n c soldering temperature (reflow) ...................................... +260 n c electrical_ characteristics (v pv_ = v en = v dd = 3.7v, v pgnd_ and v agnd = 0v, t a = -40c to +85c, unless otherwise noted. typical values are at t a = +25c.) (note 1) absolute_ maximum_ ratings parameter conditions min typ max units pv1, pv2, pv3, pv5 operating voltage 2.7 5.5 v undervoltage lockout threshold v pv1, v pv2, v pv3, v pv5 rising 2.25 2.45 2.65 v uvlo hysteresis 100 mv pv4 operating voltage 1.7 5.5 v v dd operating range v dd is supply voltage for i 2 c input block only; all other logic is supplied from pv_ 1.7 5.5 v pv_ shutdown supply current 1 (all outputs off, i 2 c disabled) en = agnd, v dd = 0v t a = +25 n c 0.1 1 f a t a = +85 n c 0.1 pv_ shutdown supply current 2 (all outputs off, i 2 c enabled) v dd = v pv3 , en = agnd t a = +25 n c 2 10 f a t a = +85 n c 2 v dd shutdown threshold v dd falling, hysteresis = 50mv 1.15 1.4 1.65 v supply current 1x mode, no load, alc off, step-up off, i ldo_ = 0ma 240 400 f a -0.5x mode, 4mhz switching, each i led_ = 0.1ma, alc off, i ldo = 0ma, step-up i o = 0ma at v pv3 = 2.7v (note 2) 6.8 ma reference bypass (refbp) output voltage 0 f a p i refbp p 1 f a 1.164 1.200 1.236 v refbp supply rejection 2.5v p v pv3 p 5.5v 0.2 5 mv thermal shutdown +160 n c thermal shutdown hysteresis 20 n c
_______________________________________________________________________________________ _ _ 3 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai i 2 c_ interface_ characteristics charge_ pump_ characteristics parameter conditions min typ max units sda, scl input high voltage v dd = 1.7v to 5.5v 0.7 x v dd v sda, scl input low voltage v dd = 1.7v to 5.5v 0.3 x v dd v sda, scl input current v il = 0v or v ih = 5.5v, v dd = 5.5v t a = +25 n c 0.01 1 f a t a = +85 n c 0.1 sda output low voltage i sda = 3ma, for acknowledge (note 3) 0.03 0.4 v clock frequency (note 3) 100 400 khz bus-free time between start and stop t buf (note 3) 1.3 f s hold time repeated start condition t hd,sta (note 3) 0.6 0.1 f s scl low period t low (note 3) 1.3 0.2 f s scl high period t high (note 3) 0.6 0.2 f s setup time repeated start condition t su,sta (note 3) 0.6 0.1 f s sda hold time t hd,dat (note 3) 0 0.01 f s sda setup time t su,dat (note 3) 100 50 ns setup time for stop condition t su,sto (note 3) 0.6 0.1 f s parameter conditions min typ max units switching frequency 4 mhz pump soft-start time 0.5 ms charge-pump regulation voltage (and ovp) v pv1 , v pv2 - v neg 4.3 5 v open-loop neg output resistance (0.5 x (v pv1 or v pv2 ) - v neg )/i neg 1.3 2.49 i guaranteed output current led v fmax = 3.9v, v pv1 = v pv2 = 3.2v 281 ma neg discharge resistance in shutdown all leds off 10 k i
4 _ _ _______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai current_ sink_ driver_ characteristics ldo1_ characteristics parameter conditions min typ max units current setting range wled1Cwled8, rgb programmable by i 2 c 0.1 25.6 ma wled_, rgb ramp-up/ramp- down time main wled_ and rgb ramp-up/ramp-down in 0.1ma increments; 8 steps are programmable through i 2 c; ramp-up and ramp-down times are set separately 0 (default) ms/ 0.1ma 0.016 0.064 0.128 0.256 0.512 1.024 2.048 wled_, rgb current accuracy 25.6ma setting, t a = +25 n c -2.5 +2.5 % 0.1ma setting, t a = +25 n c -50 q 10 +50 wled_, rgb current matching wled1Cwled8, rgb (note 4) 5 10 % wled_, rgb r dson 1x mode 2.68 i -0.5x mode 4.12 wled_, rgb current regulator dropout voltage 25.6ma setting (note 5) 1x mode t a = 0 n c to +85 n c 62 120 mv t a = -40 n c 62 150 -0.5x mode 95 200 wled_, rgb current regulator switchover threshold (1x to -0.5x) v led falling 125 150 175 mv wled_, rgb current regulator switchover hysteresis 100 mv wled_, rgb leakage in shutdown all leds off t a = +25 n c 0.01 5 f a t a = +85 n c 0.1 parameter conditions min typ max units output voltage v ldo1 (default) 200ma at v pv3 = 3.6v 2.522 2.6 2.678 v programmable output voltage i ldo1 = 50ma 2.231 2.3 2.369 v 2.425 2.5 2.575 2.522 2.6 2.678 2.619 2.7 2.781 2.716 2.8 2.884 2.813 2.9 2.987 2.910 3.0 3.090 3.007 3.1 3.193 output current 200 ma current limit v ldo1 = 90% of nominal regulation voltage (note 3) 250 475 750 ma dropout voltage i ldo1 = 200ma, t a = +25 n c 120 300 mv line regulation 3.4v p v pv3_ p 5.5v, i ldo1 = 150ma 2.4 mv load regulation 1ma < i ldo1 < 200ma 25 mv
_______________________________________________________________________________________ _ _ 5 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai ldo1_ characteristics_ (continued) ldo2_ characteristics parameter conditions min typ max units power-supply rejection d v ldo1 / d v pv3 f = 10hz to 10khz, i ldo1 = 10ma, c ldo1 = 1 f f 60 db output noise voltage (rms) f = 100hz to 100khz, i ldo1 = 10ma, c ldo1 = 1 f f 45 f v rms minimum output capacitor i ldo1 < 200ma 1 f f startup time from shutdown i ldo1 = 150ma (note 3) 40 100 f s startup transient overshoot i ldo1 = 150ma (note 3) 3 50 mv shutdown output impedance ldo1 disabled through i 2 c (default on) 1 k i parameter conditions min typ max units output voltage v ldo2 (default) 200ma at v pv3 = 3.6v 2.813 2.9 2.987 v programmable output voltage i ldo2 = 50ma 2.231 2.3 2.369 v 2.425 2.5 2.575 2.522 2.6 2.678 2.619 2.7 2.781 2.716 2.8 2.884 2.813 2.9 2.987 2.910 3.0 3.090 3.007 3.1 3.193 output current 200 ma current limit v ldo2 = 90% of nominal regulation voltage (note 4) 250 475 750 ma dropout voltage i ldo2 = 200ma, t a = +25 n c 120 300 mv line regulation 3.4v p v pv3_ p 5.5v, i ldo2 = 150ma 2.4 mv load regulation 1ma < i ldo2 < 200ma 25 mv power-supply rejection d v ldo2 / d v pv3 f = 10hz to 10khz, i ldo2 = 10ma, c ldo2 = 1 f f 60 db output noise voltage (rms) f = 100hz to 100khz, i ldo2 = 10ma, c ldo2 = 1 f f 45 f v rms minimum output capacitor i ldo2 < 200ma 1 f f startup time from shutdown i ldo2 = 150ma (note 3) 40 100 f s startup transient overshoot i ldo2 = 150ma (note 3) 3 50 mv shutdown output impedance ldo2 disabled through i 2 c (default on) 1 k i
6 _ _ _______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai ldo3_ characteristics step-up_ converter_ characteristics parameter conditions min typ max units input operating range v pv4 1.7 5.5 v output voltage v ldo3 200ma at v pv4 = 2.4v 1.764 1.80 1.854 v programmable output voltage v pv4 = 1.8v, i ldo3 = 50ma 1.164 1.2 1.236 v 1.455 1.5 1.545 v pv4 = 3.7v, i ldo3 = 50ma 1.764 1.80 1.854 2.425 2.5 2.575 output current 200 ma current limit v ldo3 = 90% of nominal regulation voltage (note 4) 250 475 750 ma dropout voltage i ldo3 = 200ma, t a = +25 n c 120 300 mv line regulation 2.4v p v pv4 p 5.5v, i ldo3 = 150ma 2.4 mv load regulation 1ma < i ldo3 < 200ma 25 mv power-supply rejection d v ldo3 / d v pv4 f = 10hz to 10khz, i ldo3 = 10ma, c ldo3 = 2.2 f f 60 db output noise voltage (rms) f = 100hz to 100khz, i ldo3 = 10ma, c ldo3 = 2.2 f f 75 f v rms minimum output capacitor 0 f a < i ldo3 < 200ma (note 3) 2.2 f f startup time from shutdown i ldo3 = 150ma (note 3) 100 250 f s startup transient overshoot i ldo3 = 150ma (note 3) 3 50 mv shutdown output impedance ldo3 disabled through i 2 c (default on) 1 k i parameter conditions min typ max units input operating range v pv5 2.7 5.5 v line regulation v out = 14v, i out = 5ma, v pv5 = 2.7v to 5.5v 0.1 %/v load regulation v out = 14v, i out = 0ma to 5ma, v pv5 = 3.7v 0.1 %/ma lx voltage range 20 v lx switch current limit 192 241 289 ma lx leakage current v lx = 20v, step-up converter disabled t a = +25 n c 0.01 2 f a t a = +85 n c 0.1 isolation pmos r ds(on) v pv5 = 2.7v, i sw = 100ma 1.5 2.4 i pmos rectifier r ds(on) lx to out, v pv5 = 3.7v, i lx = 100ma 4.0 i isolation pmos current limit v pv5 = 3.7v, v sw = 0v 0.15 0.3 0.6 a isolation pmos leakage current sw = pgnd3, v pv5 = 5.5v t a = +25 n c 0.01 1 f a t a = +85 n c 0.1 sw soft-start time v pv5 = 2.7v 0.2 ms nmos r ds(on) v pv5 = 3.7v, i lx = 100ma 0.9 1.5 i maximum lx on-time 8 11 14 f s minimum lx off-time v out > 12v 1.6 2 2.4 f s ovp threshold no feedback, v out rising 17.6 18.5 19.4 v ovp threshold hysteresis 1 v
_______________________________________________________________________________________ _ _ 7 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai step-up_ converter_ characteristics_ ( continued ) ambient_ light_ sensor_ interface key_ characteristics parameter conditions min typ max units current limit propagation delay (lx) 55 ns output voltage accuracy v pv5 = 3.7v, i out = 0ma t a = 0 n c to +85 n c -2 +2 % t a = -40 n c -2.5 +2.5 programmable output voltage v pv5 = 3.7v, i out = 0ma 13.0 v 13.5 14.0 14.5 15.0 15.5 16.0 16.5 parameter conditions min typ max units bias output voltage i bais = 200 f a, v pv3 = 3.2v to 5.5v 2.85 3.0 3.15 v bias output current v bias = 3.0v q 5% 30 ma bias dropout voltage i bias = 10ma (note 3) 125 250 mv sense input voltage range 0 v bias x 255/256 v bias discharge resistance in shutdown 1.0 1.5 k i adc resolution 8 bit adc integral nonlinearity error -3 +3 lsb adc differential nonlinearity error -1 +1 lsb sense input impedance t a = +25 n c (note 3) 1 m i waiting time for adc movement after alcen = 1 v bias = 3v bit 0 = 0 in 02h register 32 ms bit = 1 in 02h register 64 (default) ms parameter conditions min typ max units low-level output voltage i sink = 1ma 0.4 v high-level output voltage i source = 1ma 1.8 v nmos output leakage current at complementary output, v pv3 = 3.7v (note 6) t a = +25 n c 0.01 1 f a t a = +85 n c 0.1 pmos output leakage current at complementary output, v pv3 = 3.7v (note 6) t a = +25 n c 0.01 1 f a t a = +85 n c 0.1
8 _ _ _______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai cai_ characteristics gpo_ (open-drain_ output)_ characteristics en_ characteristics playr/playg/playb_ characteristics parameter conditions min typ max units pwm low-level input voltage 0.4 v pwm high-level input voltage 1.4 v pwm dimming frequency c filt = 0.1 f f (note 3) 0.1 0.2 15 khz current dimming range duty cycle = 0% to 100% (note 3) 0 25.6 ma pwm dimming resolution 1% p duty cycle p 100% (note 3) 0.256 ma/% cai enable blanking time (t b ) time from cai enable until dimming control switches to cai input (note 4) 10 ms input leakage current cai = gnd or v cai = 3.7v t a = +25 n c 0.1 1 f a t a = +85 n c 1 parameter conditions min typ max units low-level output voltage i sink = 1ma 0.2 v output leakage current v ldo__ = 2.6v t a = +25 n c 0.1 f a t a = +85 n c 1 parameter conditions min typ max units low-level input voltage 0.4 v high-level input voltage 1.4 v input leakage current v en = 0v or 3.7v t a = +25 n c 0.1 1 f a t a = +85 n c 1 parameter conditions min typ max units low-level input voltage 0.4 v high-level input voltage 1.4 v on/off pwm frequency (note 3) 2 200 hz play_ minimum high time play_ active high (bit 1 = low in register 20h) (note 3) 80 f s play_ minimum low time play_ active low (bit 1= high in register 20h) (note 3) 80 f s pulldown resistor to agnd 800 k i
_______________________________________________________________________________________ _ _ 9 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai chg _ pin_ characteristics note_ 1:_ limits are 100% production tested at t a = +25 n c. limits over the operating temperature range are guaranteed by design. note_ 2:_ 0.1ma led load current is not included. note_ 3:_ guaranteed by design. not production tested. note_ 4:_ led current matching is defined as: (i max - i max )/25.6ma. matching is for leds within the rgb group (rled, gled, bled) or the white led group (wled1Cwled8). note_ 5:_ dropout voltage is defined as the led_ to agnd voltage at which current into led_ drops 10% from the value at v led_ = 0.5v at 1x mode. note_ 6:_ v key = 0v when pulling low, leakage current from pv3. v key = 3.7v when pulling high, leakage current is to gnd. typical operating characteristics (v pv_ = v en = 3.7v, circuit of figure 1, t a = +25c, unless otherwise noted.) parameter conditions min typ max units low-level voltage i chg = 5ma 0.05 0.2 v leakage current v chg = 3.7v t a = +25 n c 0.1 1 f a t a = +85 n c 1 wled efficiency vs. input votlage, 6 matched wleds MAX8930 toc01 input voltage (v) efficiency (%) 5.0 4.5 4.0 3.5 3.0 50 60 70 80 90 100 40 2.5 5.5 i led_ = 1.6ma, 6.4ma, 16ma, 20.8m a wled efficiency vs. input votlage, 6 mismatched wleds MAX8930 toc02 input voltage (v) efficiency (%) 5.0 4.5 4.0 3.5 3.0 50 60 70 80 90 100 40 2.5 5.5 i led_ = 1.6ma, 6.4ma, 16ma, 20.8ma efficiency vs. li+ battery voltage driving 6 matched leds MAX8930 toc03 li+ battery voltage (v, time-weighted) efficiency p led /p batt (%) 3.8 3.7 3.6 3.5 3.4 3.0 3.9 4.2 50 60 70 80 90 100 40 1.6ma / led 20.8ma / led 16ma / led 6.4m a/ led efficiency vs. li+ battery voltage driving 6 mismatched leds MAX8930 toc04 li+ battery voltage (v, time-weighted) efficiency p led /p batt (%) 3.8 3.7 3.6 3.5 3.4 3.0 3.9 4.2 50 60 70 80 90 100 40 20.8ma / led 6.4ma /l ed 16ma / led 1.6ma /l ed wled current matching vs. input votlage MAX8930 toc05 input voltage (v) led current (a) 5.0 4.5 4.0 3.5 3.0 0.0255 0.0256 0.0257 0.0258 0.0259 0.0260 0.0261 0.0262 0.0263 0.0264 0.0265 0.0254 2.5 5.5 i led_ = 25.6ma wledcharge pump inactive MAX8930 toc06 v c1p v c1n v c2p v c2n v neg 0v 0v 0v 0v 0v 100ns /div v pv_ = 3.8v, i led_ = 25.6ma
10 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai typical operating characteristics (continued) (v pv_ = v en = 3.7v, circuit of figure 1, t a = +25c, unless otherwise noted.) wledcharge pump active MAX8930 toc07 v c1p v c1n v c2p v c2n v neg 2v/div 0v 0v 2v/div 0v 2v/div 0v 2v/div 2v/div 0v 100ns /div v pv_ = 3.8v, i led = 25.6ma wleddimming current transient with slope control MAX8930 toc08 i led1 i led2 10ma /div 10ma /div 10ms /div 0.256ms/0.1ma slope 1ma 1ma 20ma 20ma wleddimming current transient by i 2 c MAX8930 toc09 i led1 i led2 10ma /div 10ma /div 1ms /div 10ma 10ma 20ma 20ma wleddimming current transient by cai MAX8930 toc10 v cai v sda i led1 i led2 2v/div 10ma /div 10ma /div 2v/div 0ma 0ma 0ma 0ma 4ms /div i 2 c setting = 25.6ma to 20ma wleddimming current transient by cai and i 2 c MAX8930 toc11 v cai i led1 i led2 2v/div 10ma /div 10ma /div 0ma 0ma 0ma 2ms /div i 2 c setting = 20ma wleddimming current transient by alc MAX8930 toc12 v sense i led1 i led2 1v/div 0v 20ma /div 0ma 20ma /div 0ma 100ms /div
______________________________________________________________________________________ _ _ 11 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai typical operating characteristics (continued) (v pv_ = v en = 3.7v, circuit of figure 1, t a = +25c, unless otherwise noted.) wleddimming current transient by alc with slope control MAX8930 toc13 v sense i led1 i led2 1v/div 0v 20ma /div 0ma 20ma /div 0ma 100ms /div 0.256m s/ 0.1ma slope wleddimming current transient by alc and cai MAX8930 toc14 v sense v cai i led1 i led2 2v/div 0v 2v/div 0ma 10ma /div 0ma 10ma /div 0ma 100ms /div wledled1 open circuit, v pv = 3.8v MAX8930 toc15 v neg v led1 i led1 i led2 0v 1v/div 0v 2v/div 20ma /div 20ma /div 0ma 0ma 400 s /div wledled1 open circuit, v pv = 3.2v MAX8930 toc16 v neg v led1 i led1 i led2 0v 1v/div 0v 2v/div 20ma /div 0ma 20ma /div 0ma 400 s /div rgbcurrent transient by i 2 c with slope control MAX8930 toc17 i rled i gled i bled 10ma/div 10ma/div 10ma/div 0v 0ma 0ma 10ms /div 0.256m s/ 0.1ma slope rgbplay_ o n/ off transition, logic-high MAX8930 toc18 v play_ i rled i gled i bled 5v/div 0v 10ma/div 10ma/div 10ma/div 0ma 0ma 0ma 10ms /div i 2 c setting = 10ma
12 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai typical operating characteristics (continued) (v pv_ = v en = 3.7v, circuit of figure 1, t a = +25c, unless otherwise noted.) rgbplay_ o n/ off transition, logic-low MAX8930 toc19 v play_ i rled i gled i bled 5v/div 0v 10ma/div 10ma/div 10ma/div 0ma 0ma 0ma 10ms /div i 2 c setting = 10ma rgbplay_ o n/ off transition and i 2 c coming MAX8930 toc20 i rled i gled i bled 10ma/div 10ma/div 10ma/div 10ms /div 10ma 10ma 10ma ldo startupno load MAX8930 toc21 v ldo1 v ldo2 v ldo3 2v/div 1v/div 2v/div 0v 0v 0v 10ms /div ldo shutdowndefault active discharge on MAX8930 toc22 v ldo1 v ldo2 v ldo3 2v/div 1v/div 2v/div 0v 0v 0v 2ms /div ldoline transient MAX8930 toc23 v pv v ldo1 v ldo2 v ldo3 1v/div ac-coupled 50mv/div ac-coupled 50mv/div ac-coupled 50mv/div 100 s /div 3.2v 4.2v ldo1 load transient MAX8930 toc24 v ldo1 i ldo1 v ldo2 v ldo3 200ma/div 0ma ac-coupled 50mv/div ac-coupled 20mv/div ac-coupled 50mv/div 10ms /div 0ma 150ma
______________________________________________________________________________________ _ _ 13 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai typical operating characteristics (continued) (v pv_ = v en = 3.7v, circuit of figure 1, t a = +25c, unless otherwise noted.) ldo2 load transient MAX8930 toc25 v ldo1 i ldo2 v ldo2 v ldo3 200ma/div 0ma ac-coupled 20mv/div ac-coupled 50mv/div ac-coupled 20mv/div 10ms /div 0ma 150ma ldo3 load transient MAX8930 toc26 v ldo1 i ldo2 v ldo2 v ldo3 200ma/div 0ma ac-coupled 20mv/div ac-coupled 20mv/div ac-coupled 50mv/div 10ms /div 0ma 150ma ldo1 and ldo2output voltage transient1 MAX8930 toc27 v ldo1 v ldo2 1v/div 1v/div 100ms /div 2.6v 2.6v 3.0v 2.9v ldo1 and ldo2output voltage transient2 MAX8930 toc28 v ldo1 v ldo2 1v/div 1v/div 100ms /div 3.0v 3.0v 2.3v 2.6v ldo3output voltage transient1 MAX8930 toc29 v ldo3 1v/div 100ms /div 1.8v 1.2v ldo3output voltage transient2 MAX8930 toc30 v ldo3 1v/div 100ms /div 1.8v 1.2v
14 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai typical operating characteristics (continued) (v pv_ = v en = 3.7v, circuit of figure 1, t a = +25c, unless otherwise noted.) ldo1 short circuit MAX8930 toc31 i ldo1 v ldo1 v ldo2 v ldo3 100ma/div 0ma 2v/div 0v 2v/div 0v 2v/div 0v 1ms /div keyo n/ off by i 2 c MAX8930 toc32 v scl v sda v key 2v/div 2v/div 0v 2v/div 0v 0v 400 s /div keyo n/ off by alc MAX8930 toc33 v sense v key 2v/div 0v 1v/div 0v 200ms /div keyo n/ off by internal pwm, no slope MAX8930 toc34 v key 2v/div 0v 1ms /div i 2 c: internal 500khz, 50% duty cycle alcstartup, t wait = 64ms MAX8930 toc35 v bias v sense v key 1v/div 2v/div 2v/div 0v 0v 0v 20ms /div alcstartup, t wait = 32ms MAX8930 toc36 v bias v sense v key 1v/div 2v/div 2v/div 0v 0v 0v 20ms /div
______________________________________________________________________________________ _ _ 15 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai typical operating characteristics (continued) (v pv_ = v en = 3.7v, circuit of figure 1, t a = +25c, unless otherwise noted.) step-up efficiency vs. load current MAX8930 toc37 output current (ma) efficiency (%) 6 4 2 10 20 30 40 50 60 70 80 0 0 8 v in = 3.6v, v out = 14v step-up load regulation vs. output current MAX8930 toc38 output current (ma) normalized output votlage 6 4 2 0.97 0.98 0.99 1.00 1.01 1.02 1.03 1.04 0.96 0 8 v in = 3.6v, v out = 14v step-up switching frequency vs. input voltage MAX8930 toc39 input voltage (v) switching frequency (khz) 5.0 4.5 4.0 3.5 3.0 20 40 60 80 100 120 0 2.5 5.5 i out = 5ma, v out = 14v step-up switching frequency vs output current MAX8930 toc40 output current (ma) switching frequency (khz) 6 4 2 20 40 60 80 100 120 140 160 180 200 0 0 8 v in = 3.6v, v out = 14v step-up soft-start MAX8930 toc41 v sda v out i lx v lx 10v/div 10v/div 5v/div 0v 200ma/div 0a 0v 0v 100 s /div step-up load transient MAX8930 toc42 i out v out ac-coupled 100mv/div 10ma/div 10ms /div 5ma
16 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai typical operating characteristics (continued) (v pv_ = v en = 3.7v, circuit of figure 1, t a = +25c, unless otherwise noted.) step-up line transient MAX8930 toc43 v in v out ac-coupled 100mv/div 1v/div 400 s /div 4.2v 3.2v step-up switching waveforms MAX8930 toc44 v out v lx i lx ac-coupled 200mv/div 200ma/div 0a 10v/div 0v 4 s /div step-up output voltage transient MAX8930 toc45 v out v sda 2v/div 2v/div 0v 400 s /div 16v 14v step-up output open circuit MAX8930 toc46 i out v lx i lx 10v/div 200ma /div 0a 10ma /div 0a 0v 100 s /div step-up output short circuit MAX8930 toc47 v out v lx i lx 500ma /div 0a 10v/div 0v 10v/div 0v 200 s /div gpoon/off mode ldo1, ldo2, ldo3 by i 2 c MAX8930 toc48 v sda v ldo1 v ldo2 v ldo3 5v/div 0v 2v/div 0v 2v/div 0v 2v/div 0v 2ms /div ldo mode gpo mode
______________________________________________________________________________________ _ _ 17 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai pin configuration pin description pv3 ldo1 pv2 eca gnd 2 3 4 1 a ldo3 ldo2 pv1 pv4 b refbp en top view pgnd 3 pv5 5 c1p c2p key c agnd sda pgnd1 pgnd2 v dd d scl playr playg gled filt e f g + sw 6 out c1n c2n rled eca gnd 7 lx neg wled1 wled2 cai playb chg bled bias wled3 wled4 sense wled8 wled7 wled6 eca gnd wled5 eca gnd pin name function externally_connected_to_pgnd a1, a7, g1, g7 ecagnd connect to agnd power_input_supply_and_power_ground a2 pv3 supply voltage input for ref, bias, ldo1, and ldo2. the input voltage range is 2.7v to 5.5v. bypass pv3 to agnd with a 2.2 f f ceramic capacitor as close as possible to the ic. pv3 is high impedance during shutdown. connect pv3 to pv1, pv2, and pv5. a4 pv2 supply voltage input. connect pv2 to pv1. a5 pv5 supply voltage input for the step-up converter. the input voltage range is 2.7v to 5.5v. bypass pv5 to pgnd3 with a 1 f f ceramic capacitor as close as possible to the ic. pv5 is high impedance during shutdown. connect pv5 to pv1, pv2, and pv3. b1 pv4 supply voltage input for ldo3. the input voltage range is 1.7v to 5.5v. bypass pv4 to agnd with a 2.2 f f ceramic capacitor as close as possible to the ic. pv4 is high impedance during shutdown. if pv4 is not used separately, connect pv4 to pv1. b4 pv1 supply voltage input for charge-pump circuitry. the input voltage range is 2.7v to 5.5v. bypass pv1 to pgnd1 and pgnd2 with a 4.7 f f to 10 f f ceramic capacitor as close as possible to the ic. pv1 is high impedance during shutdown. connect pv1 to pv2, pv3, and pv5.
18 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai pin description (continued) pin name function c4 pgnd3 power ground for the step-up converter d4 pgnd1 power ground for the charge-pump block d5 pgnd2 power ground for the charge-pump block ldo_function a3 ldo1 output of ldo1. the default value is 2.6v. bypass ldo1 to agnd with a 1 f f ceramic capacitor as close as possible to the ic. b3 ldo2 output of ldo2. the default value is 2.9v. bypass ldo2 to agnd with a 1 f f ceramic capacitor as close as possible to the ic. b2 ldo3 output of ldo3. the default value is 1.80v. bypass ldo3 to agnd with a minimum 2.2 f f ceramic capacitor as close as possible to the ic. logic_and_enable_function d1 v dd logic-supply voltage input. bypass v dd to agnd with a 0.1 f f ceramic capacitor as close as possible to the ic. the input range is 1.7v to 5.5v. d3 sda i 2 c data input. data is read on the rising edge of scl. connect a 1.5k i resistor from sda to v dd . e2 scl i 2 c clock input. data is read on the rising edge of scl. connect a 1.5k i resistor from scl to v dd . d2 agnd analog ground. connect agnd to the system ground plane. c3 en hardware enable input for the ic. drive en high to activate the ic. drive en low to disable the ic. wled_and_rgb_dimming_related_function f2 cai brightness control input by contents adaptive interface (dpwm signal). cai varies the brightness of main wleds from 0% to 100%. the dimming frequency is typically 200hz. when cai is used as the main control method for main white leds, the ramp-up/ramp-down is automatically disabled. e3 playr on/off input for the red led current regulator. the playr signal can be either active high or active low. program either active high or active low through the 20h register. e4 playg on/off input for the green led current regulator. the playg signal can be either active high or active low. program either active high or active low through the 20h register. f3 playb on/off input for the blue led current regulator. the playb signal can be either active high or active low. program either active high or active low through the 20h register. e1 filt pwm filter capacitor. connect a 0.1 f f ceramic capacitor between filt and agnd as close as possible to filt. c1 key key backlight control output. two threshold values for on/off are available and programmable through the i 2 c serial interface. key on/off function is controlled by the i 2 c, alc, or the internal 500hz pwm signal. program the settings for key through the i 2 c interface. c2 refbp 1.20v reference output. bypass refbp to agnd with 0.1 f f ceramic capacitor as close as possible to the ic. do not load refbp. automatic_luminance_control f1 bias bias output for an external light sensor. bypass bias to agnd with a 1 f f ceramic capacitor as close as possible to the ic. the bias output is 3.0v. g2 sense input from ambient light sensor. connect a 5.1k i resistor from sense to agnd. charge-pump_block b5 c1p transfer capacitor 1 positive connection. connect a 1 f f ceramic capacitor from c1p to c1n. c6 c1n transfer capacitor 1 negative connection. connect a 1 f f ceramic capacitor from c1p to c1n. c5 c2p transfer capacitor 2 positive connection. connect a 1 f f ceramic capacitor from c2p to c2n.
______________________________________________________________________________________ _ _ 19 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai pin description (continued) pin name function c7 neg charge-pump negative output. connect a 1 f f to 2.2 f f ceramic capacitor from neg to pgnd1. in shutdown, an internal 10k i resistor pulls neg to pgnd. d6 c2n transfer capacitor 2 negative connection. connect a 1 f f ceramic capacitor from c2p to c2n. wled_and_rgb_ d7 wled1 wled current sink regulator. current into wled1 is based upon the programmed internal i 2 c registers. connect wled1 to the cathodes of external leds. wled1 is high impedance during shutdown. if unused, short wled1 to pv3. e7 wled2 wled current sink regulator. current into wled2 is based upon the programmed internal i 2 c registers. connect wled2 to the cathodes of external leds. wled2 is high impedance during shutdown. if unused, short wled2 to pv3. f6 wled3 wled current sink regulator. current into wled3 is based upon the programmed internal i 2 c registers. connect wled3 to the cathode of an external wled. wled3 is high impedance during shutdown. if unused, short wled3 to pv3. f7 wled4 wled current sink regulator. current into wled4 is based upon the programmed internal i 2 c registers. connect wled4 to the cathode of an external led. wled4 is high impedance during shutdown. if unused, short wled4 to p3. g6 wled5 wled current sink regulator. current into wled5 is based upon the programmed internal i 2 c registers. connect wled5 to the cathode of an external wled. wled5 is high impedance during shutdown. if unused, short wled5 to either pv3 or disable the regulator. g5 wled6 wled current sink regulator. current into wled6 is based upon the programmed internal i 2 c registers. connect wled6 to the cathode of an external wled. wled6 is high impedance during shutdown. if unused, short wled6 to either pv3 or disable the regulator. g4 wled7 wled current sink regulator. current into wled7 is based upon the programmed internal i 2 c registers. connect wled7 to the cathode of an external wled. wled7 is high impedance during shutdown. if unused, short wled7 to either pv3 or disable the regulator. g3 wled8 wled current sink regulator. current into wled8 is based upon the programmed internal i 2 c registers. connect wled8 to the cathode of an external wled. wled8 is high impedance during shutdown. if unused, short wled8 to either pv3 or disable the regulator. e6 rled red led connection. the brightness is set up by i 2 c. on/off is synchronized with the pwm signal applied to playr pin. rled maximum brightness is enabled/disabled through the serial interface. e5 gled green led connection. the brightness is set up by i 2 c. on/off is synchronized with the pwm signal applied to playg pin. gled maximum brightness is enabled/disabled through the serial interface. f5 bled blue led connection. the brightness is set up by i 2 c. on/off is synchronized with the pwm signal applied to playb pin. bled maximum brightness is enabled/disabled through the serial interface. boost_converter b6 out step-up converter output. bypass out to gnd with a 1 f f ceramic capacitor. during shutdown, out is pulled to pgnd3 by an internal 1m i resistor. a6 sw isolation switch output for the step-up converter. sw is internally connected to the drain of a p-channel mosfet and used to isolate the output of the step-up from the input during shutdown. if true shutdown is not required, sw can be left open with the input supply connected directly to the inductor.
20 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai pin description (continued) external components note: all output capacitors are ceramic and x7r/x5r type. pin external_ components notes pv1, pv2, pv3, pv5 10 f f total capacitance r total ldo, boost, and charge-pump capacitance system stability pv4 2.2 f f ldo stability v dd 0.1 f f decoupling bias 1 f f ldo compensation ldo1 1 f f ldo compensation ldo2 1 f f ldo compensation ldo3 2.2 f f ldo compensation filt 0.1 f f noise filter refbp 0.1 f f noise filter c1p, c1n 1 f f charge pump c2p, c2n 1 f f charge pump neg 2.2 f f charge pump wled1Cwled8 white led rled, gled, bled red, green, blue led chg a resister, for example 10k i current limit sw, lx 22 f h boost converter out 1 f f boost stability sense 5.1k i converter ambient light to a voltage alc toshiba tps852 any type (linear/log) of photo ic pin name function b7 lx inductor switching connection. connect the inductor between lx and sw. for most applications, use a 22 f h inductor. status_indicator f4 chg charging status output. chg is an open-drain output that goes low when the battery is charging. on/off is operated by i 2 c. chg is high impedance when the ic is in shutdown mode. enable chg through the i 2 c interface.
______________________________________________________________________________________ _ _ 21 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai figure 1. typical application and block diagram 4.7f 0.1f input 2.7v to 5.5v cai i 2 c interface wled1 input wled2 main wled3 wled4 wled5 wled6 wled7 wled8 pgnd2 refbp v dd scl agnd en 1.7v to 5.5v pgnd1 pv1 pv2 4.7f 0.1f 0.1f 0.1hz to 15khz 1f 2.2f 1.7v to 5.5v filt 2hz to 200hz playr playg playb light sensor sense pv3 2.2f pv4 bias rled gled bled chg ldo1 2.6v at 200ma 2.9v at 200ma 1.8v at 200ma 22h input 13v to 16.5v at 8ma 1f 1f 2.2f key sw lx ecagnd ecagnd c1p 1f 2.2f c1n 1f c2p c2n neg sda brightness and slope control negative charge pump brightness and slope control on/off 800ki 800ki 5.1ki 800ki 3v out alcen = 1 sensor interface alc ocp ovp tsd 4mhz osc negative charge pump on/off (play/i 2 c) on/off pv3 ldo1 1f pv5 ldo2 pv3 ldo2 ldo3 out 1f pgnd3 1.226v pv4 ldo3 on/off by alc on/off by alc on/off by i 2 c pwm (500hz) control logic (pfm) error amp ovp ecagnd ecagnd sub pwm (content adaptive interface) inverting -0.5x charge pump MAX8930
22 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai detailed description the MAX8930 integrates a negative charge pump for both white led display backlighting with a mbient l ight c ontrol (alc) function , content adaptive interface (cai) function, and r/g/b led. there is one step-up converter for passive matrix oled ( pmoled ) oriented application and three ldos with programmable output voltage . the three ldo outputs are able to convert to gpo (general- purpose output) status through an i 2 c command. the MAX8930 includes soft - start, thermal shutdown, open- circuit, and short-circuit protection in the charge - pump circuitry. reset control the MAX8930 uses two different methods of reset: soft - ware and hardware. software_ reset: all the registers are initiated by reset = 1 at register 00h. after that, the values in all registers come back to por (power-on-reset) state. the bit of reset in 00h is automatically returned to 0. auto return to 0. hardware_ reset: hardware reset is done by toggling en from logic-high to logic-low. all the registers under hard - ware reset conditions are returned to their initial values (por) and stop receiving any commands. open-circuit and short-circuit protection if any wled/rgb fails as an open circuit, that led pin pulls to ground, and the ic is forced into -0.5x mode. therefore, connect any unused wled_/rgb pins to pv1, pv2, or pv3 to disable the corresponding current regu - lator. the MAX8930 contains special circuitry to detect this condition and disables the corresponding current regulator to avoid wasting battery current. thermal shutdown the MAX8930 includes a thermal-limit circuit that shuts down the ic at about +160 n c. the part turns on after the ic cools by approximately 20 n c. thermal shutdown is applied to the following blocks: ? white and rgb led driver ? step-up converter ? ldo1, ldo2, ldo3 ? sbias led charge pump the charge pump drives up to 8 white leds (4 w leds for m ain and 4 w leds for s ub) and 3 rgb leds with regulated constant current for both display backlight and fun light applications. by utilizing individually adaptive 1x/-0.5x negative charge-pump modes and extremely low-dropout current regulators, it is able to achieve high efficiency over the full 1-cell lithium battery input volt - age range. high-frequency switching of 4mhz allows for tiny external components. the regulation scheme is optimized to ensure low emi and low input ripple. each channel for wled and rgb led has the capability of delivering 25.6ma with 256 dimming step s (0.1ma per step). the current-level adjustment is programmed by an i 2 c command . figure 2 is the flow chart of the startup and mode-change algorithm. figure 2. startup and mode change algorithm en = high, reset = 0 and maini2c = 1, main wled = 1 or wled5?8 = 1 or ri2c, gi2c, bi2c = 1 any v led < 150mv pump soft-start done (0.5ms typ) all v led > 250mv pump off pump off all wled_ and rgb in 1x mode pump soft -st ar t pump gate-drive ramped all wled_ and rgb in 1x mode pump on pump on each wled_ and rgb in 1x or -0.5x mode as needed shutdown v neg discharged by resistor reset = 1 or en = 0 or main wled = 0 and wled5?8 = 0 and ri2c, gi2c, bi2c = 0
______________________________________________________________________________________ _ _ 23 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai wled1Cwled8 driver operation the white led current regulators are composed of 4 main-group drivers (wled1 Cwled 4) and 4 subgroup drivers (wled5 Cwled 8). the current of the main-group leds can be selected by an i 2 c register. both ambient light control (alc) mode and ramp-up/ramp-down con- control (alc) mode and ramp-up/ramp-down con- c ontrol (alc) mode and ramp-up/ramp-down con- ontrol (alc) mode and ramp-up/ramp-down con- and ramp-up/ramp-down con - trol are applied to only the m ain- g roup white leds . the subgroup leds can choose either individual control or can belong to the main group based on the status of a bit in the register (01h and 02h). in this function , combination s can be adjusted as required . for example, main 4ch + sub 4ch or main 5ch + sub 3ch. the cai (pwm) signal from either the lcd driver module or baseband chipset control s only the main-group wleds. t he up/down slope control can be programmed by the set ting of the 0ah register when the main leds are controlled by either i 2 c or alc. for main leds, there are three different dimming control methods , i 2 c, alc , and cai. the dimming range for main leds and sub leds is from 0.1ma to 25.6ma in 0.1ma increments. rgb driver operation the brightness for each color led has 256 different steps (0.1ma to 25.6ma). the rgb led can be activat - ed by either the high/low status of the play_ pwm signal or by i 2 c on/off command. the default dimming con - trol is i 2 c command. an i 2 c command for dimming can adjust the current of each rgb individually. the opera - tion of on/off by i 2 c command also allows individual control. however, the operation of on/off by pwm to play_ rgb is group control. to operate with either an active-high or active-low signal coming from the micro - processor such as audio processor, the register related to active high or active low should be selected first (the bit 1 in 20h). when a call comes in or music plays, all rgb leds are allowed to be activated by either a pwm signal applied to play_ or a designated register by i 2 c. the main purpose for the play_ is for on/off control function and not for dimming control. if the dimming cur - rent is set to 10ma on each rgb led, the pwm signal to play_ rgb turns all of the current regulators on or off at the same time. however, the dimming current for rgb can be set by i 2 c command during on/off operation. when the play_ is in active-high period, the rgb cur - rent regulator is on with 10ma current. when the play_ is in the opposite state (active-low period), the rgb regulator is off with 0ma current. the default method to turn the rgb led on is to pull the play_ input high with a minimum on-time of 80 f s in active-high mode. if bit 1 in 20h is set to 1, then all current regulators for rgb are activated by active-low signal with a minimum off-time of 80 f s. the up/down slope control can be programmed by the setting of the 0bh register when the rgb leds are controlled by i 2 c only. if bit 7 in 20h is set to logic-low, then slope up/down is automatically deactivated. cai (contents adaptive interface) operation a 200hz pwm signal is applied to the cai pin. the cai signal can be from either the lcd driver module with gamma correction information or from the baseband chipset. the main wled can be activated by either the high/low status of the cai pwm signal or with either an active-high or active-low signal coming from either a lcd driver module or baseband chipset. the corre - sponding register bit (bit 0 in 02h) should be set to either, 1 or 0 by i 2 c command. depending on the duty cycle, the brightness varies from 0ma to 25.6ma with the resolution of 0.256ma per 1% duty variation. in control of cai (pwm) independently, the existing brightness setting from either i 2 c or alc is over - written because cai has the priority over i 2 c and alc. see the dimming by digital pwm on cai only and dimming by both digital pwm on cai and either i 2 c or alc at the same time sections for details on the cai dimming control. dimming by digital pwm on cai only when the digital pwm (dpwm) signal (100hz ~15khz) is provided by either the baseband or cpu for dimming the brightness, the MAX8930 dpwm function takes over the responsibility of dimming the main wleds. the dimming by cai is initiated by setting cai (bit 7 of register 02h) to 1. after the set-up, both i 2 c register dimming settings and alc no longer control the dimming current for the main wleds. the frequency range on the cai pin is from 100hz to 15khz, where 0% duty cycle corresponds to 0ma and 100% duty cycle corresponds to full current, 25.6ma. when cai is set to 1, the ramp-up/down slope for main wled_ is automatically disabled by the MAX8930 con - trol logic. figure 3 is the timing diagram on initiating cai. the MAX8930 maintains its previous dimming setting for t b (10ms typ) to allow the pwm filter time to settle to its average value before activating cai dimming. this is done automatically inside the ic. the bit of maini2c
24 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai should be set to 0 in less than t b , 10ms (typ) for cai dim - ming to be exclusively through dpwm. if this setup fails, the previous dimming current is still effective even though bit 7 in 02h (cai) has been set to 1. the current of i1, i2, and i3 of figure 3 is different depending on the duty cycle of dpwm. t b is the settling time for the cai input filter to calculate an average value for the dimming current. dimming by both digital pwm on cai and either i 2 c or alc at the same time if an end-user wants to see either tv or a movie, the lcd driver module may take care of dimming control independently. in this situation, the output signal from the lcd module has some color information. for example, (16ma/led) + gamma correction can make the user feel the same brightness of the lcd screen compared to (20ma/led) + no gamma correction. in this combined dimming control, any dimming current set earlier by either the i 2 c register or the alc register is the value corresponding with 100% duty cycle of the cai signal. ambient light control operation dimming of the lcd backlight and on/off control of the keypad backlight are possible on the basis of the data detected by an external ambient light sensor. the alc consists of the following segments: ? bias function (3v output) ? 8-bit adc with an average filter ? a slope process function ? a log scale conversion function a wide range of ambient light sensors can be used with the MAX8930, including photo diode, photo transistor, photo ic (a linear output/log output), etc. the detected amount of ambient light is changed into digital data by figure 3. timing diagram of stand-alone cai dimming operation i 2 c command (cai = 1 at reg 3) dimming by i 2 c (maini2c = 1 at 02h) cai enabled by i 2 c cai (dpwm) signal wled current by i 2 c i 2 c command should be out before 10ms wled current by cai i 1 i 2 i 3 t b : blanking time, the time for converting dpwm to average dimming current t b dimming by i 2 c (maini2c = 0 at 02h)
______________________________________________________________________________________ _ _ 25 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai the embedded digital processing. this data can be read through the i 2 c (0dh). the conversion to led current can be accomplished either through a built-in initial lookup table or a built-in user settable lookup table. when alc is activated, the brightness settings of the main leds are controlled through the alc control cir - cuitry and not by the baseband processor. the default setting on power-on reset is for control by the baseband processor. on/off of alc block for main wleds alc operation can be activated independently for the main led and the keypad backlight. the alcen bit in register 00h activates ambient light control. the kbalc bit in register 00h activates on/off for the keypad back - light in alc mode. for keypad backlight, the output is simple logic-high/logic-low. bias voltage for a sensor an embedded ldo with a nominal 3v output provides the bias voltage for the ambient light sensor. this bias output is enabled as soon as the alcen bit is set to 1. the operation of the bias output voltage has two options based on the value of the sbias bit (bit 7 in register 0ch). when this bit is set to 1, the bias output is synchronized with the measurement cycle. this means that the bias voltage generator is active only when a measurement cycle is being performed. the measurement cycle has four different times, 0.52s, 1.05s, 1.57s, and 2.10s. when this bit is set to 0, the bias output is always on as long as the alcen bit is set to 1. brightness data conversion 16 different dimming steps are available depending on the ambient light condition. the selection of the log or linear conversion is possible by the setting of the lsty bit (bit 6 of register 0ch). linear_ type_ sensor: log conversion log_ type_ sensor: data bypass the brightness data can be read through i 2 c (register at 0dh). led current conversion the following is the initial current value to each level of ambient light. this value can be overwritten by i 2 c command. figure 4. alc block diagram offset correction bias voltage (3v) sense bias light sensor (log or linear) linear/log average filter logarithmic conversion ambient level scale 16 ambient levels input detect threshold and hysteresis ambient light level read by i 2 c at this point (1x, -0.5x cp) wled_ neg key pwm slope and max duty input current conversion slope process 8-bit adc data correction on/off by alc on/off by i 2 c pwm (500hz)
26 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 1._ brightness_ data_ conversion_ settings table_ 2._ led_ current_ conversion ambient_ level with_ log_ conversion (linear_ type_ of_ sensor) without_ log_ conversion (log_ type_ of_ sensor) 0h v sbias x 0/256 v sbias x 0/256 ~ v sbias x 17/256 1h v sbias x 1/256 v sbias x18/256 ~ v sbias x 26/256 2h v sbias x 2/256 v sbias x 27/256 ~ v sbias x 36/256 3h v sbias x 3/256 ~ v sbias x 4/256 v sbias x 37/256 ~ v sbias x 47/256 4h v sbias x 5/256 ~ v sbias x 6/256 v sbias x 48/256 ~ v sbias x 59/256 5h v sbias x 7/256 ~ v sbias x 9/256 v sbias x 60/256 ~ v sbias x 71/256 6h v sbias x 10/256 ~ v sbias x 13/256 v sbias x 72/256 ~ v sbias x 83/256 7h v sbias x 14/256 ~ v sbias x 19/256 v sbias x 84/256 ~ v sbias x 95/256 8h v sbias x 20/256 ~ v sbias x 27/256 v sbias x 96/256 ~ v sbias x 107/256 9h v sbias x 28/256 ~ v sbias x 38/256 v sbias x 108/256 ~ v sbias x 119/256 ah v sbias x 39/256 ~ v sbias x 53/256 v sbias x 120/256 ~ v sbias x 131/256 bh v sbias x 54/256 ~ v sbias x 74/256 v sbias x 132/256 ~ v sbias x 143/256 ch v sbias x 75/256 ~ v sbias x 104/256 v sbias x 144/256 ~ v sbias x 155/256 dh v sbias x 105/256 ~ v sbias x 144/256 v sbias x 156/256 ~ v sbias x 168/256 eh v sbias x 145/256 ~ v sbias x 199/256 v sbias x 169/256 ~ v sbias x 181/256 fh v sbias x 200/256 ~ v sbias x 255/256 v sbias x 182/256 ~ v sbias x 255/256 brightness initial current_ (ma) brightness initial current_ (ma) 0 0fh 1.6 8 89h 13.8 1 1eh 3.1 9 98h 15.3 2 2dh 4.6 a a7h 16.8 3 3ch 6.1 b b6h 18.3 4 4ch 7.7 c c6h 19.9 5 5bh 9.2 d d5h 21.4 6 6ah 10.7 e e4h 22.9 7 79h 12.2 f f9h 25.0
______________________________________________________________________________________ _ _ 27 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai the operation of alc function table 3 shows the various conditions on the main wled_ current for lcd backlight. sensor interface as a default value, 3v is applied from the bias pin. the sensed voltage at the sense pin is transformed into digital data by the embedded 8-bit adc. a/d conversion the detection of ambient light condition is performed in periodic time steps (4 options). bias and adc are turned off except when reading the ambient light condition. the sensor is also turned off in between measurements. this leads to lower power consumption. for the first 64ms, the ambient light data is discarded because the data might be inaccurate information in startup period. for table_ 3._ alc_ function figure 5. alc a/d conversion * the alc for wled backlight is disabled in this mode. it means the current for the lcd backlight is set up by the main led cur - rent value using either i 2 c or cai. ? the alc for wled backlight is enabled in this mode. it means the current for the lcd backlight is set up by the ambient light data from 0h to fh. ad signal start 1 t(ad) = 1ms 16 times measurement alcen = 1 alc mode on/off adc read cycle bias output = 3v adc movement ambient light data t(alc) = 80.4ms t(ad) = 16.4ms t wait = 64ms or 32ms adc read 1 cycle (alcyc1, alcyc2) alc_ on/off main_ wled__ on/off alc_ block lcd_ backlight_ current 0 0 off off 0 1 setup by main led current* 1 0 on off 1 1 setup by ambient light data ?
28 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai the next 16.4ms, the internal digital logic block tries to read the ambient light condition 16 times and calculate the average data. this read data is automatically saved in register 0dh. up/down slope control the up/down slope control is sometimes necessary for dimming the main wled_ in a natural way. the up (dark to bright), down (bright to dark) main wled current tran - sition speeds are set individually. the default value of the up/down slope is 0s. it is pro - grammable by the settings of control bits in register 0ah. the up/down slope time is per 0.1ma increment; for example, if the i led1 current is 0ma and the up slope time is set to 2.048ms. after reading the ambient light condition and getting i led2 with 20ma, the total time from i led1 to i led2 is 0.4096s [(20ma/0.1ma) x 2.048ms = 0.4096s]. adc data offset adjustment the accuracy of the alc control circuitry can be cali - brated in each ic using the adc data offset adjustment register. this offset adjustment can correct for parameter variation in the ic and in the external light sensor. this adjustment is performed with bits 3C0 in register 0ch. table 4 shows all possibilities of dimming control for both main wleds and key. table_ 4._ summary_ of_ dimming_ control_ for_ main_ wleds_ and_ key figure 6. led current vs. brightness original data slope-applied data iled 2 brightness iled 1 led current i 2 c alc cai_ (pwm) pwm (500hz) i 2 c_ +_ alc_ i 2 c_ +_ cai_ alc _ +_ cai i 2 c_ +_ cai_ +_ alc main_ white leds dimming yes (default) yes yes no no yes yes no up/ down slope control available available not available not available not available not available not available not available key on/off yes (default) yes no yes no no no no duty transition control_ time not available not available not available available not available not available not available not available
______________________________________________________________________________________ _ _ 29 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai key (keypad backlight) on/off control operation the keypad lighting is controlled by 3 methods, which are all exclusive of each other. these are: ? alc ? pwm ? i 2 c command if kbalc (bit 1 of 00h) is set to 1, then alc for keypad is on, otherwise, it is off. if kypwm (bit 0 of 03h) is set to 1, pwm for keypad is on, otherwise, it is off. if kyi2c (bit 5 of 02h) is set to 1, i 2 c for keypad is on, otherwise, it is off. the ambient light level at which the key backlight is turned off can be set in register 0fh. the default ambi - ent light is ah. there is also a programmable hysteresis level, accessed through i 2 c in the 0fh register. the default hysteresis width is 3h. see figure 7. there is a built in pwm that has a 500hz operation fre - quency. the dimming can be adjusted by duty ratio (set kydt_ bit in register 0eh). the key output is simply a 1 bit value representing on or off function. keypad backlight on/off operation by alc to link the keypad backlight on/off control to the alc, the register bit, kbalc, at register 00h, should be set to 1 (see table 5). table_ 5._ keypad_ backlight_ on/off_ by_ alc * the alc block is disabled in this mode. in this condition, keypad backlight is activated and controlled by either internal pwm operation (500hz) or i 2 c. ** the alc block is enabled in this mode. however kbalc bit is still set to 0. therefore, the on/off control should be either i 2 c or internal 500hz pwm. *** the alc block is enabled in this mode. alc has priority over both internal pwm and i 2 c in case kbalc bit is set to 1. this means that the activation of the key backlight depends on the preprogrammed on/off threshold and hysteresis width. figure 7. key on/off hysteresis keypad on/off keypad on 3h level (hysteresis to be on) keypad off brightness level ah level (threshold to be off) alcen kbalc main_wleds_in_alc_mode alc_block key_backlight 0 0 no off off 0 1 on/off by i 2 c or pwm* 1 0 yes on on/off by i 2 c or pwm** 1 1 yes on on/off depends on alc data level***
30 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai the ambient light level at which the key backlight is turned off can be set in register 0fh. the default ambi - ent light level is ah, which is bright enough for the user to recognize the numbers on the keypad. at this time, the key output is held off. there is also a programmable hysteresis level, accessed through i 2 c in the 0fh regis - ter. the default hysteresis width is 3h. the key output is held high on any hysteresis value minus 1h. for example, if the hysteresis is set to 3h, in this default condition, the key output is held low at ah level and then high at 6h level. keypad backlight on/off operation by pwm there is a built-in pwm signal operating at a frequency of 500hz. the on/off can be adjusted by duty cycle ratio (set kydt_ bit in register 0eh). 16 different duty values of pwm are available in register 0eh. in addition, fade-in and fade-out can also be set up with the kysl_ bits in the 0eh register. keypad backlight on/off operation by i 2 c command there is a dedicated register bit (kyi2c at 02h, see table 15) to both enable and disable the key function. this i 2 c on/off is the default for key. control of duty transition time control in internal pwm mode (500hz) the internal 500hz pwm can set up the duty transition control time by the register (kysl1 and kysl2 at 0eh). figure 8 shows the duty transition in slope-applied mode. low-drop output (ldo) operation the linear regulators are designed for low-input, low- dropout, low quiescent current to maximize battery life. all ldos are controlled through the serial interface, mini - mizing the requirements of control lines to the MAX8930. each of the ldos are turned on or off through the setting of the control bits in the on/off control register, 00h. for each ldo, it is possible to set the output voltage and enable/disable the active pulldown resistor (1k i typ) during power-off. this is done in the 03h and 04h reg - isters. for optimized battery life, there are two external supply voltage inputs, pv3 for ldo1 and ldo2 and pv4 for ldo3. this allows the input voltage of the ldo to be supplied from a lower voltage power rail, resulting in higher efficiency operation and longer battery life. ldo3 is a low v in ldo (v in = 1.7v to 5.5v). the input voltage, v pv3 and v pv4 must be greater than the selected ldo1 to ldo3 voltages. gpo operation three ldo outputs have the option of being converted to gpo outputs through an i 2 c command. figure 9 shows the external connections. the register, 24h, is respon - sible for this setup. in gpo mode, the output capacitors should be removed in advance, otherwise, there is some delay in both turn-on and turn-off mode. component selection use only ceramic capacitors with an x5r, x7r, or bet - ter dielectric. see the table 6 for a list of recommended parts. connect a 1 f f and 2.2 f f ceramic capacitor between ldo1, ldo2, and ldo3 and pgnd3, respec - tively, for 200ma applications. the ldo output capaci - tors equivalent series resistance (esr) affects stability and output noise. use output capacitors with an esr of 0.1 i or less to ensure stability and optimum transient figure 9. ldo gpo configuration figure 8. slope time-in internal pwm mode (500hz) time target duty valu e slope time output waveform of key pin pwn duty ldo1 ldo1 i/o voltage ldo2 ldo3 ldo2 ldo3 output output output
______________________________________________________________________________________ _ _ 31 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai response. connect c ldo as close as possible to the MAX8930 to minimize the impact of pcb trace inductance. step-up dc-dc converter operation the step-up dc-dc converter operates from a 2.7v to 5.5v supply. the MAX8930 includes an internal high- voltage nmosfet switch with low on-resistance and a synchronous rectifier to reduce losses and achieve higher efficiency. a true-shutdown feature disconnects the battery from the load and reduces the supply current to 0.05 f a. this dc-dc converter provides adjustable output voltage from 13.0v to 16.5v with 0.5v steps. the adjustment bits are located in the 04h register. control scheme the step-up dc-dc features a minimum off-time, cur - rent-limited control scheme operating in discontinuous conduction mode. an internal p-channel mosfet switch connects pv5 to sw to provide power to the inductor when the converter is operating. when the converter is shut down, this switch disconnects the input supply from the inductor. to boost the output voltage, an n-channel mosfet switch turns on and allows the inductor current to ramp up to the current limit. once the inductor cur - rent reaches the current limit, the switch turns off and the inductor current flows through synchronous recti - fier (pmos) to supply the output voltage. the switching frequency varies depending on the load and input and output voltage and can be up to 750khz. setting the output voltage the output voltage of the step-up converter is set by bit, boost1 to boost3, in register 04h. the output voltage can be adjusted from 13.0v to 16.5v in 0.5v increments. shutdown if bit 6, suen, in register 00h is set to 0, the step-up converter enters shutdown. during shutdown, the output is disconnected from the input, and lx enters a high- impedance state. the capacitance and load at the out - put determine the rate at which v out decays. soft-start the step-up converter uses two soft-start mechanisms. when the true-shutdown feature is used, the gate of the internal synchronous turns on slowly to prevent inrush current. this takes approximately 0.04ms (typ). when sw is fully turned on, the internal n-channel switch begins boosting the input to set the output voltage. protection features the step-up converter has protection features designed to make it extremely robust to application errors. if the output capacitor in the application is missing, the con - verter protects the internal switch from being damaged. table_ 6._ recommended_ capacitors table_ 7._ protection_ features designation value_ (f) manufacturer part_ number description c pv3 2.2 tdk c2012x5r0j225m 2.2 f f q 20%, 6.3v x5r ceramic capacitor c pv4 (in case of external supply) 2.2 tdk c2012x5r0j225m 2.2 f f q 20%, 6.3v x5r ceramic capacitor c ldo1 1 tdk c1005x5r0j105m 1 f f q 20%, 6.3v x5r ceramic capacitor c ldo2 1 tdk c1005x5r0j105m 1 f f q 20%, 6.3v x5r ceramic capacitor c ldo3 2.2 tdk c1005x5r0j225m 2.2 f f q 20%, 6.3v x5r ceramic capacitor application_faults protection output shorted to ground true off-switch detects short, opens when current reaches the synchronous rectifier current limit, and restarts soft-start. this protects the inductor and the synchronous rectifier. output capacitor missing lx may boost one or two times before the internal fb voltage exceeds the trip point. in the rare case where the capacitive loading and external loading on out is small enough that the energy in one cycle can slew it more than 22v, the internal ovp operates at the typical threshold value, 18.5v.
32 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai inductor selection smaller inductance values typically offer smaller physi - cal size for a given series resistance or saturation cur - rent. the inductors saturation current rating should be greater than the peak switching current. recommended inductor values range from 10 f h to 100 f h (e.g., 22 f h, vlf3010at-220mr33-1, tdk). capacitor selection small, ceramic surface-mount capacitors with x7r or x5r temperature characteristics are recommended due to their small size, low cost, low equivalent series resis - tance (esr), and low equivalent series inductance (esl). if nonceramic capacitors are used, it is important that they have low esr to reduce the output ripple voltage and peak-to-peak load transient voltage. chg charge-indicator output chg is an open-drain output that indicates charger sta - tus and can be used with an led. chg goes low during charging when the bit of chg at 02h is 1. chg goes high impedance when the bit of chg at 02h is 0. when this function is used in conjunction with a microproces - sor ( f p), connect a pullup resistor between chg and the logic i/o voltage to indicate charge status to the f p. i 2 c interface the slave address for MAX8930 is ec/dh in write/read mode. table_ 8._ recommended_ inductors table_ 9._ recommended_ capacitors table_ 10._ slave_ address figure 10. sda and scl bit transfer data line stable data valid sda scl change of data allowed designation value_ (h) dcr_ ( i ) manufacturer part current_ (ma) l sw 22 1.5 tdk vlf3010at-220mr33-1 330 22 4.0 panasonic eljpc220kf 160 22 1.0 taiyo yuden lb2016-220 105 22 5.0 taiyo yuden lem2520-220 125 47 2.2 sumida cmd4d11-47 180 68 3.3 taiyo yuden lemc3225-680 120 designation value_(f) manufacturer part description c pv5 1 tdk c2012x5r0j105m 1 f f q 20%, 6.3v x5r ceramic capacitor c out 1 taiyo yuden tmk316bj105kl 1 f f q 20%, 25v x7r ceramic capacitor a7 a6 a5 a4 a3 a2 a1 r/w 1 1 1 0 1 1 0 1/0
______________________________________________________________________________________ _ _ 33 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai i 2 c bit transfer one data bit is transferred for each clock pulse. the data on sda must remain stable during the high portion of the clock pulse as changes in data during this time are interpreted as a control signal. i 2 c start and stop conditions both sda and scl remain high when the bus is not busy. a high-to-low transition of sda, while scl is high is defined as the start (s) condition. a low-to-high transi - tion of the data line while scl is high is defined as the stop (p) condition. i 2 c system configuration a device on the i 2 c bus that generates a message is called a transmitter and a device that receives the mes - sage is a receiver. the device that controls the message is the master and the devices that are controlled by the master are called slaves. i 2 c acknowledge the number of data bytes between the start and stop conditions for the transmitter and receiver are unlimited. each 8-bit byte is followed by an acknowledge bit. the acknowledge bit is a high-level signal put on data by the transmitter during which time the master generates an extra acknowledge related clock pulse. a slave receiver that is addressed must generate an acknowledge after each byte it receives. also, a master receiver must gen - erate an acknowledge after each byte it receives that has been clocked out of the slave transmitter. figure 12. i 2 c master and slave configuration figure 11. start and stop conditions t low t high t su ,dat repeated start condition t su,sta t hd,sta stop condition start condition t su,sto t buf t hd,sta t r t f scl sda t hd,dat start condition master transmitter/ receiver sda sclk slave receiver slave transmitter/ receiver
34 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai figure 13. i 2 c acknowledge table_ 11._ led_ current_ levels the device that acknowledges must pull down the sda line during the acknowledge clock pulse, so that the sda line is stable low during the high period of the acknowl - edge clock pulse (setup and hold times must also be met). a master receiver must signal an end of data to the transmitter by not generating an acknowledge on the last byte that has been clocked out of the slave. in this case, the transmitter must leave sda high to enable the master to generate a stop condition. current level for 8 wleds and 3 rgb leds the total 11 leds (8 wleds and 3 rgb leds) have linear scale current dimming by 0.1ma step as follows. d7 1 2 8 9 d6 not acknowledge not acknowledge clock pulse for acknowledgement start condition sda output from transmitter sda output from receiver scl from master d0 bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 led_ current_ (ma) 0 0 0 0 0 0 0 0 0.1 0 0 0 0 0 0 0 1 0.2 0 0 0 0 0 0 1 0 0.3 0 0 0 0 0 0 1 1 0.4 0 0 0 0 0 1 0 0 0.5 0 0 0 0 0 1 0 1 0.6 0 0 0 0 0 1 1 0 0.7 1 1 1 1 1 1 1 0 25.5 1 1 1 1 1 1 1 1 25.6
______________________________________________________________________________________ _ _ 35 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 12._ register_ map address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 function 00h 00 reset suen ldo1 ldo2 ldo3 main wled kbalc alcen on/off control for boost, ldo1, ldo2, ldo3, main wled_, alc 01h 00 wled7 wled6 wled5 sub7 sub6 sub5 rgb slope led slope on/off control for backlight- related leds 02h 26 cai chg kyi2c wled8 sub8 x main i2c hlcai on/off control for dimming- related signal, bias output 03h 6c ldo10 ldo11 ldo12 x ldo20 ldo21 ldo22 kypwm output program for ldo1 and ldo2 04h ba ldo 30 ldo 31 ldo1adis ldo2adis ldo3adis boost1 boost2 boost3 output program for ldo3 and boost 05h 01 imled7 imled6 imled5 imled4 imled3 imled2 imled1 imled0 256 steps current scale for main wleds 06h 01 isled7 isled6 isled5 isled4 isled3 isled2 isled1 isled0 256 steps current scale for sub wled5 07h 01 isled7 isled6 isled5 isled4 isled3 isled2 isled1 isled0 256 steps current scale for sub wled6 08h 01 isled7 isled6 isled5 isled4 isled3 isled2 isled1 isled0 256 steps current scale for sub wled7
36 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 12._ register_ map_ (continued) address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 function 09h 01 isled7 isled6 isled5 isled4 isled3 isled2 isled1 isled0 256 steps current scale for sub wled8 0ah 00 x dslp3 dslp2 dslp1 x uslp3 uslp2 uslp1 slope con - trol for main wleds in step-up/ down 0bh 00 x dslp3 dslp2 dslp1 x uslp3 uslp2 uslp1 slope con - trol for rgb in step-up/ down 0ch 10 sbias lsty alcyc1 alcyc2 ost1 ost2 ost3 ost4 control for alc-related functions 0dh alda1 alda2 alda3 alda4 x x x twait read the adc data based on ambient condition 0eh 00 kysl1 kysl2 x kydt0 kydt1 kydt2 kydt3 kydt4 control for pwm slope and duty 0fh a8 kyhs1 kyhs2 kyth1 kyth2 kyth3 kyth4 x x control for hysteresis width and on/off 10h 0f cada07 cada06 cada05 cada04 cada03 cada02 cada01 cada00 current level of 0h 11h 1e cada17 cada16 cada15 cada14 cada13 cada12 cada11 cada10 current level of 1h 12h 2d cada27 cada26 cada25 cada24 cada23 cada22 cada21 cada20 current level of 2h 13h 3c cada37 cada36 cada35 cada34 cada33 cada32 cada31 cada30 current level of 3h 14h 4c cada47 cada46 cada45 cada44 cada43 cada42 cada41 cada40 current level of 4h 15h 5b cada57 cada56 cada55 cada54 cada53 cada52 cada51 cada50 current level of 5h
______________________________________________________________________________________ _ _ 37 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 12._ register_ map_ (continued) x = dont care. por = default state at reset and initial startup condition. address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 function 16h 6a cada67 cada66 cada65 cada64 cada63 cada62 cada61 cada60 current level of 6h 17h 79 cada77 cada76 cada75 cada74 cada73 cada72 cada71 cada70 current level of 7h 18h 89 cada87 cada86 cada85 cada84 cada83 cada82 cada81 cada80 current level of 8h 19h 98 cada97 cada96 cada95 cada94 cada93 cada92 cada91 cada90 current level of 9h 1ah a7 cadaa7 cadaa6 cadaa5 cadaa4 cadaa3 cadaa2 cadaa1 cadaa0 current level of ah 1bh b6 cadab7 cadab6 cadab5 cadab4 cadab3 cadab2 cadab1 cadab0 current level of bh 1ch c6 cadac7 cadac6 cadac5 cadac4 cadac3 cadac2 cadac1 cadac0 current level of ch 1dh d5 cadad7 cadad6 cadad5 cadad4 cadad3 cadad2 cadad1 cadad0 current level of dh 1eh e4 cadae7 cadae6 cadae5 cadae4 cadae3 cadae2 cadae1 cadae0 current level of eh 1fh f9 cadaf7 cadaf6 cadaf5 cadaf4 cadaf3 cadaf2 cadaf1 cadaf0 current level of fh 20h 00 rgben x x ri2c gi2c bi2c hlrgb x control for on/off of rgb 21h 01 rled7 rled6 rled5 rled4 rled3 rled2 rled1 rled0 current level for red 22h 01 gled7 gled6 gled5 gled4 gled3 gled2 gled1 gled0 current level for green 23h 01 bled7 bled6 bled5 bled4 bled3 bled2 bled1 bled0 current level for blue 24h 00 gpo1 gpo2 x gpld1 gpld2 gpld3 gpwd8 x on/off for gpo
38 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 13._ on/off_ register_ 1_ for_ boost,_ ldo1,_ ldo2,_ ldo3,_ main_ wled,_ and_ alc table _ 14. _ on/off _ register _ 2 _ for _ backlight-related _ wled5, _ wled6, _ wled7 _ and _ rgb address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 00 00 reset suen ldo1 ldo2 ldo3 main wled kb alc alc en name por r/w description reset 0 r/w 1: ic is reset, back to por status 0: reset is off suen 0 r/w 1: boost output is on 0: boost output is off ldo1 0 r/w 1: ldo1 output is on 0: ldo1 output is off ldo2 0 r/w 1: ldo2 output is on 0: ldo2 output is off ldo3 0 r/w 1: ldo3 output is on 0: ldo3 output is off main wled 0 r/w 1: main wleds are on 0: main wleds are off kbalc 0 r/w 1: alc for keypad is on 0: alc for keypad is off alcen 0 r/w 1: alc function for main wleds is on 0: alc function is off address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 01 00 wled7 wled6 wled5 sub7 sub6 sub5 rgb slope led slope name por r/w description wled7 0 r/w 1: wled7 output is on 0: wled7 output is off wled6 0 r/w 1: wled6 output is on 0: wled6 output is off wled5 0 r/w 1: wled5 output is on 0: wled5 output is off sub7 0 r/w 1: wled7 belongs to main group 0: wled7 belongs to subgroup sub6 0 r/w 1: wled6 belongs to main group 0: wled6 belongs to subgroup sub5 0 r/w 1: wled5 belongs to main group 0: wled5 belongs to subgroup rgb slope 0 r/w 1: dimming slope for rgb led is on 0: dimming slope is off led slope 0 r/w 1: dimming slope for main wled_ is on 0: dimming slope is off
______________________________________________________________________________________ _ _ 39 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 16._ ldo1_ and_ ldo2_ register table_ 15._ on/off_ register_ 3 address_ (hex) por_ (hex) r/w bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 03 4a r/w ldo10 ldo11 ldo12 reserved ldo20 ldo21 ldo22 kypwm description ldo10 ldo11 ldo12 ldo1_ voltage_ (v) 0 0 0 2.3 0 0 1 2.5 0 1 0 2.6 (default) 0 1 1 2.7 1 0 0 2.8 1 0 1 2.9 1 1 0 3.0 1 1 1 3.1 ldo20 ldo21 ldo22 ldo2_ voltage_ (v) 0 0 0 2.3 0 0 1 2.5 0 1 0 2.6 0 1 1 2.7 1 0 0 2.8 1 0 1 2.9 (default) 1 1 0 3.0 1 1 1 3.1 name por description kypwm 0 1: pwm for keypad is on. 0: pwm for keypad is off address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 02 26 cai chg kyi2c wled8 sub8 twait main i 2 c hlcai name por r/w description cai 0 r/w 1: cai dimming for main wleds is on 0: off chg 0 r/w 1: nmos for charging indicator is on 0: off kyi2c 1 r/w 1: i 2 c for keypad is on 0: i 2 c for keypad is off wled8 0 r/w 1: wled8 output is on 0: wled8 output is off sub8 0 r/w 1: wled8 belongs to main group 0: wled8 belongs to subgroup twait 1 r/w 1: 64ms waiting time for alc calculation 0: 32ms maini2c 1 r/w 1: i 2 c dimming for main wleds is on 0: i 2 c dimming for main wleds is off hlcai 0 r/w 1: active low for main wled_ activated 0: active high to be on
40 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 17._ ldo3,_ step-up,_ ldo1,_ ldo2,_ and_ ldo3_ active_ discharge_ function_ register table_ 18._ dimming_ current_ register_ for_ main_ wleds address_ (hex) por_ (hex) r/w bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 04 ba r/w ldo30 ldo31 ldo1 adis ldo2 adis ldo3 adis boost1 boost2 boost3 description ldo30 ldo31 ldo3 voltage 0 0 1.2v 0 1 1.5v 1 0 1.8v (default) 1 1 2.5v name por description ldo1adis 1 1: enable ldo1 active discharge 0: disable ldo1 active discharge ldo2adis 1 1: enable ldo2 active discharge 0: disable ldo2 active discharge ldo3adis 1 1: enable ldo3 active discharge 0: disable ldo3 active discharge boost1 boost2 boost3 output_ (v) 0 0 0 13.0 0 0 1 13.5 0 1 0 14.0 (default) 0 1 1 14.5 1 0 0 15.0 1 0 1 15.5 1 1 0 16.0 1 1 1 16.5 address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 05 01 imled7 imled6 imled5 imled4 imled3 imled2 imled1 imled0 name por r/w description imled7 0 r/w bit comments imled6 0 r/w 7 6 5 4 3 2 1 0 imled5 0 r/w 0 0 0 0 0 0 0 0 minimum current = 0.1ma imled4 0 r/w 0 0 0 0 0 0 0 1 0.2ma set as default imled3 0 r/w u u u u u u u u u imled2 0 r/w 1 1 1 1 1 1 1 1 maximum led current = 25.6ma imled1 0 r/w 256 steps from 0.1 to 25.6ma by 0.1ma step by binary value increment imled0 1 r/w
______________________________________________________________________________________ _ _ 41 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 19._ dimming_ current_ register_ for_ sub_ wled5 table_ 20._ dimming_ current_ register_ for_ sub_ wled6 address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 06 01 isled7 isled6 isled5 isled4 isled3 isled2 isled1 isled0 name por r/w description isled7 0 r/w bit comments isled6 0 r/w 7 6 5 4 3 2 1 0 isled5 0 r/w 0 0 0 0 0 0 0 0 minimum current = 0.1ma isled4 0 r/w 0 0 0 0 0 0 0 1 0.2ma set as default isled3 0 r/w u u u u u u u u u isled2 0 r/w 1 1 1 1 1 1 1 1 maximum led current = 25.6ma isled1 0 r/w 256 steps from 0.1 to 25.6ma by 0.1ma step by binary value increment isled0 1 r/w address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 07 01 isled7 isled6 isled5 isled4 isled3 isled2 isled1 isled0 name por r/w description isled7 0 r/w bit comments isled6 0 r/w 7 6 5 4 3 2 1 0 isled5 0 r/w 0 0 0 0 0 0 0 0 minimum current = 0.1ma isled4 0 r/w 0 0 0 0 0 0 0 1 0.2ma set as default isled3 0 r/w u u u u u u u u u isled2 0 r/w 1 1 1 1 1 1 1 1 maximum led current = 25.6ma isled1 0 r/w 256 steps from 0.1 to 25.6ma by 0.1ma step by binary value increment isled0 1 r/w
42 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 21._ dimming_ current_ register_ for_ sub_ wled7 table_ 22._ dimming_ current_ register_ for_ sub_ wled8 address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 08 01 isled7 isled6 isled5 isled4 isled3 isled2 isled1 isled0 name por r/w description isled7 0 r/w bit comments isled6 0 r/w 7 6 5 4 3 2 1 0 isled5 0 r/w 0 0 0 0 0 0 0 0 minimum current = 0.1ma isled4 0 r/w 0 0 0 0 0 0 0 1 0.2ma set as default isled3 0 r/w u u u u u u u u u isled2 0 r/w 1 1 1 1 1 1 1 1 maximum led current = 25.6ma isled1 0 r/w 256 steps from 0.1 to 25.6ma by 0.1ma step by binary value increment isled0 1 r/w address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 09 01 isled7 isled6 isled5 isled4 isled3 isled2 isled1 isled0 name por r/w description isled7 0 r/w bit comments isled6 0 r/w 7 6 5 4 3 2 1 0 isled5 0 r/w 0 0 0 0 0 0 0 0 minimum current = 0.1ma isled4 0 r/w 0 0 0 0 0 0 0 1 0.2ma set as default isled3 0 r/w u u u u u u u u u isled2 0 r/w 1 1 1 1 1 1 1 1 maximum led current = 25.6ma isled1 0 r/w 256 steps from 0.1 to 25.6ma by 0.1ma step by binary value increment isled0 1 r/w
______________________________________________________________________________________ _ _ 43 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 23._ slope_ control_ register_ for_ main_ wleds table_ 24._ slope_ control_ register_ for_ rgb_ led table_ 25._ ramp-up/down_ transition_ time_ in_ 0.1ma_ step address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 0a 00 reserved dslp3 dslp2 dslp1 reserved uslp3 uslp2 uslp1 name por r/w description dslp3 0 r/w slope control for ramp down and up has 8 steps, respectively (see details in table 25) dslp2 0 r/w dslp1 0 r/w uslp4 0 r/w uslp4 0 r/w uslp3 0 r/w address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 0b 00 reserved dslp3 dslp2 dslp1 reserved uslp3 uslp2 uslp1 name por r/w description dslp3 0 r/w slope control for ramp down and up has 8 steps, respectively (see details in table 25) dslp2 0 r/w dslp1 0 r/w uslp4 0 r/w uslp4 0 r/w uslp3 0 r/w bit comments 6 5 4 3 2 1 0 0 0 0 u u u 0 seconds (default) 0 0 1 u u u 0.016ms (2 4 x 1fs) 0 1 0 u u u 0.068ms (2 6 x 1fs) 0 1 1 u u u 0.128ms (2 7 x 1fs) 1 0 0 u u u 0.256ms (2 8 x 1fs) 1 0 1 u u u 0.512ms (2 9 x 1fs) 1 1 0 u u u 1.024ms (2 10 x 1fs) 1 1 1 u u u 2.048ms (2 11 x 1fs) u u u 0 0 0 0 seconds (default) u u u 0 0 1 0.016ms (2 4 x 1fs) u u u 0 1 0 0.068ms (2 6 x 1 f s) u u u 0 1 1 0.128ms (2 7 x 1 f s) u u u 1 0 0 0.256ms (2 8 x 1 f s) u u u 1 0 1 0.512ms (2 9 x 1 f s) u u u 1 1 0 1.024ms (2 10 x 1 f s) u u u 1 1 1 2.048ms (2 11 x 1 f s)
44 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 26._ alc_ control_ register_ 1 address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 0c 10 sbias lsty alcyc1 alcyc2 ost1 ost2 ost3 ost4 name por r/w description sbias 0 r/w 1: measurement cycle is synchronized 0: always on lsty 0 r/w 1: log type of light sensor is connected 0: linear type sensor alcyc1 0 r/w the measurement cycle 00: 0.52s; 01: 1.05s 10: 1.57s; 11: 2.10s alcyc2 1 ost_ 0 r/w optimize the offset of adc data ost1 ost2 ost3 ost4 offset_ value 0 0 0 0 non-offset (default) 0 0 0 1 +1 lsb 0 0 1 0 +2 lsb 0 0 1 1 +3 lsb 0 1 0 0 +4 lsb 0 1 0 1 +5 lsb 0 1 1 0 +6 lsb 0 1 1 1 +7 lsb 1 0 0 0 -8 lsb 1 0 0 1 -7 lsb 1 0 1 0 -6 lsb 1 0 1 1 -5 lsb 1 1 0 0 -4 lsb 1 1 0 1 -3 lsb 1 1 1 0 -2 lsb 1 1 1 1 -1 lsb
______________________________________________________________________________________ _ _ 45 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai pcb layout table_ 27._ alc_ control_ register_ 2 address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 0d 00 alda1 alda2 alda3 alda4 reserved reserved reserved reserved name por r/w description alda_ r 16 different levels based on ambient light conditions alda1 alda2 alda3 alda4 ambient_ light_ condition 0 0 0 0 0h level 0 0 0 1 1h level 0 0 1 0 2h level 0 0 1 1 3h level 0 1 0 0 4h level 0 1 0 1 5h level 0 1 1 0 6h level 0 1 1 1 7h level 1 0 0 0 8h level 1 0 0 1 9h level 1 0 1 0 ah level 1 0 1 1 bh level 1 1 0 0 ch level 1 1 0 1 dh level 1 1 1 0 eh level 1 1 1 1 fh level
46 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 28._ keypad_ control_ register address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 0e 00 kysl1 kysl2 reserved kydt0 kydt1 kydt2 kydt3 kydt4 name por r/w description kysl_ 0 r/w pwm slope time is the transition time for stepping to the next duty ratio (both up and down) kysl1 kysl2 pwm_ slope_ rising_ time_ (ms) 0 0 0 (default) 0 1 32 1 0 64 1 1 128 name por r/w description kydt_ 0 r/w duty is set by the active-high period kydt0 kydt0 kydt2 kydt3 kydt4 duty ratio 0 0 0 0 0 0% (default) 0 0 0 0 1 6.25% 0 0 0 1 0 12.5% 0 0 0 1 1 18.75% 0 0 1 0 0 25.0% 0 0 1 0 1 31.25% 0 0 1 1 0 37.5% 0 0 1 1 1 43.75% 0 1 0 0 0 50.0% 0 1 0 0 1 56.25% 0 1 0 1 0 62.5% 0 1 0 1 1 68.75% 0 1 1 0 0 75.0% 0 1 1 0 1 81.25% 0 1 1 1 0 87.5% 0 1 1 1 1 93.75% 1 0 0 0 0 100%
______________________________________________________________________________________ _ _ 47 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 29._ keypad_ control_ register_ for_ alc address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 0f a8 kyhs1 kyhs2 kyth1 kyth2 kyth3 kyth4 reserved reserved name por r/w description kyhs_ 10 r/w the hysteresis values between on and off. the value should meet the following equation. the value of kyth_ - the value of kyhs_ > 1 kyhs1 kyhs2 hysteresis values 0 0 no hysteresis 0 1 2h 1 0 3h 1 1 4h name por r/w description kyth_ r/w determine the off time based on ambient light condition kyth1 kyth2 kyth3 kyth4 keypad off kyth1 0 0 0 0 0h off 0 0 0 0 1 1h off 0 0 0 1 0 2h off 0 0 0 1 1 3h off 0 0 1 0 0 4h off 0 0 1 0 1 5h off 0 0 1 1 0 6h off 0 0 1 1 1 7h off 0 1 0 0 0 8h off 1 1 0 0 1 9h off 1 1 0 1 0 ah off 1 1 0 1 1 bh off 1 1 1 0 0 ch off 1 1 1 0 1 dh off 1 1 1 1 0 eh off 1 1 1 1 1 fh off 1
48 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 30._ control_ register_ in_ acl_ 1C16_ table_ 31._ rgb_ led_ on/off_ control_ register table_ 32._ red_ led_ dimming_ current_ control_ register * refers to 0~f address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 10~1f cada*7 cada*6 cada*5 cada*4 cada*3 cada*2 cada*1 cada*0 name por r/w description cada* r/w bit comments 7 6 5 4 3 2 1 0 0 0 0 0 0 0 0 0 minimum current = 0.1ma 0 0 0 0 0 0 0 1 0.2ma set as default u u u u u u u u u 1 1 1 1 1 1 1 1 maximum led current = 25.6ma 256 steps from 0.1 to 25.6ma by 0.1ma step by binary value increment address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 20 00 rgben reserved reserved ri2c gi2c bi2c hlrgb reserved name por r/w description rgben 0 r/w 1: rgb led is on by i 2 c 0: rgb led is on by play pin ri2c 0 r/w 1: red led is on by i 2 c 0: off gi2c 0 r/w 1: green led is on by i 2 c 0: off bi2c 0 r/w 1: blue led is on by i 2 c 0: off hlrgb 0 r/w 1: active low for rgb led activated 0: active high for rgb led on address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 21 01 rled7 rled6 rled5 rled4 rled3 rled2 rled1 rled0 name por r/w description rled7 0 r/w bit comments rled6 0 r/w 7 6 5 4 3 2 1 0 rled5 0 r/w 0 0 0 0 0 0 0 0 minimum current = 0.1ma rled4 0 r/w 0 0 0 0 0 0 0 1 0.2ma set as default rled3 0 r/w u u u u u u u u u rled2 0 r/w 1 1 1 1 1 1 1 1 maximum led current = 25.6ma rled1 0 r/w 256 steps from 0.1 to 25.6ma by 0.1ma step by binary value increment rled0 1 r/w
______________________________________________________________________________________ _ _ 49 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai table_ 33._ green_ led_ dimming_ current_ control_ register table_ 34._ blue_ led_ dimming_ current_ control_ register table_ 35._ on/off_ control_ register address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 22 01 gled7 gled6 gled5 gled4 gled3 gled2 gled1 gled0 name por r/w description gled7 0 r/w bit comments gled6 0 r/w 7 6 5 4 3 2 1 0 gled5 0 r/w 0 0 0 0 0 0 0 0 minimum current = 0.1ma gled4 0 r/w 0 0 0 0 0 0 0 1 0.2ma set as default gled3 0 r/w u u u u u u u u u gled2 0 r/w 1 1 1 1 1 1 1 1 maximum led current = 25.6ma gled1 0 r/w 256 steps from 0.1 to 25.6ma by 0.1ma step by binary value increment gled0 1 r/w address_ (hex) por_ (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 23 01 bled7 bled6 bled5 bled4 bled3 bled2 bled1 bled0 name por r/w description bled7 0 r/w bit comments bled6 0 r/w 7 6 5 4 3 2 1 0 bled5 0 r/w 0 0 0 0 0 0 0 0 minimum current = 0.1ma bled4 0 r/w 0 0 0 0 0 0 0 1 0.2ma set as default bled3 0 r/w u u u u u u u u u bled2 0 r/w 1 1 1 1 1 1 1 1 maximum led current = 25.6ma bled1 0 r/w 256 steps from 0.1 to 25.6ma by 0.1ma step by binary value increment bled0 1 r/w address_ (hex) por (hex) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 24 00 gpo1 reserved reserved gpld1 gpld2 gpld3 reserved reserved name por r/w description gpo1 0 r/w 1: gpo mode 0: ldo mode for ldo1, ldo2, ldo3 gpld1 0 r/w 1: output low for ldo1 (power sw on) 0: output high (power sw off) gpld2 0 r/w 1: output low for ldo2 (power sw on) 0: output high (power sw off) gpld3 0 r/w 1: output low for ldo3 (power sw on) 0: output high (power sw off)
50 _ _ ______________________________________________________________________________________ MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai typical operating circuit p input 1.7v to 5.5v input 2.7v to 5.5v v dd refbp pv4 pv5 wled1 input wled2 wled3 wled4 wled5 wled6 wled7 wled8 pv3 pgnd2 pgnd1 pv1 pv2 neg agnd c1p c1n c2p c2n filt scl sda en cai playr playg playb sense light sensor bias rled gled bled chg ldo1 ldo2 ldo3 out key sw lx pgnd3 ecagnd ecagnd ecagnd ecagnd input v dd MAX8930
______________________________________________________________________________________ _ _ 51 MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai good pcb layout is essential for optimizing performance. use large traces for the power-supply inputs to minimize losses due to parasitic trace resistance and route heat away from the device. good design minimizes excessive emi on the switching paths and voltage gradients in the ground plane, resulting in a stable and well regulated charge pump. connect all capacitors as close as pos - sible to the ic and keep their traces short, direct, and wide. keep noisy traces, as short as possible. connect agnd, pgnd1, pgnd2, and pgnd3 to the common ground plane. chip information process: bicmos
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 52_ ___________________ _ ________ maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2010 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. MAX8930 wled charge pump, rgb, oled boost, ldos with alc and cai package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package_type package_code document_no. 49 wlp w493b3+2 21-0441

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