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eum6820 ds6820 v e r1.0 oct. 2009 1 100ma current sink vcm driver with i 2 c interface description the eum6 82 0 is a single 10-bit dac with 100ma output current sink capability. it features an internal reference, i 2 c interface , 10 bits dac and current sense resistor. the dac is controlled via a 2-wire (i 2 c com p atible) serial interface that operates at clock rates up to 400khz. the eum6820 can operates from 2.3v to 5.5v. the eum6820 incorporates a power-on reset circuit, which ensures that dac output powers up to 0v and remains there until a valid write takes place. it has a power-down feature that reduces the current consumption of the device to 1a maximum. the eum6820 principally designed for linear control of voice coil motors, targeting at autofocus, image stabilization, and optical zoom applications in camera phones , digital still cameras, and camcorders. while it may also used in many industrial applications, such as controlling temperature, light, and movement. the i 2 c address for the eum6820 is 0 18. application cir c uit feature s z 10 0 m a current sink z 2-wire (i 2 c-comp atibl e) 1.8v serial interface z 10-bit resolution dac z 2.3v to 5.5v power supply z guaranteed monotonic over all codes z power-down to 0.5a typical z internal reference z current sense resistor integrated z power-down function z power-on reset z available in 1.0mm 1.5mm wcsp-6 package z rohs compliant and 100% lead (pb)-free applications z camera ph one s z digital still cameras z web/pc cameras z digital video cameras/camcorders z lens autofocus z lens covers z optical zoom z image stabilization z shutters z neutral density filters figur e 1. application circuit v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 2 pin configurations package type pin configurations wcsp-6 pin description pin wcsp-6 description isink a1 output current sink en a2 enable pin. logic hi enable the device, and logic low disable the device. gnd b1 ground sda b2 i 2 c interface signal (data) vdd c1 power supply scl c2 i 2 c interface signal (clock) block diagram figure 2. block diagram n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 3 ordering information order number package type marking operating temperature range EUM6820HIR1 wcsp-6 xxx d00 -40c to +85c eum6820 ?? ?? ?? ?? lead free code 1: lead free 0: lead packing r: tape & reel operating temperature range i: industry standard package type h:wcsp n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 4 absolute maximum ratings ? vdd -------------------------------------------------------------------------------- ?0.3v to +5.5v ? scl, sda ------------------------------------------------------------------ ?0.3v to vdd + 0.3v ? en ---------------------------------------------------------------------------- ?0.3v to vdd + 0.3v ? isink voltage -------------------------------------------------------------- ?0.3v to vdd + 0.3v ? operating temperature range ----------------------------------------------- ? 40c to +85c ? storage temperature range ----------------------------------------------- ? 65c to +150c ? junction temperature (t j max ) ------------------------------------------------------ 150c electrical characteristics v dd from 2.3v to 5.5v, load resistance r l =25? connected to v dd full operating temperature range (ta from -40 j to +85 j ) unless otherwise noted. eum6820 parameter symbol conditions min. typ. max. unit power supply power supply voltage v dd v dd =2.8v to 3.6v ; device operates over 2.3v to 5.5v with reduced performance 2.3 5.5 v operating current i dd v dd =3.6v 0.16 ma power down current isd @ power down mode 0.5 a dc characteristics resolution 97.65a/lsb 10 bits relative accuracy inl 1.5 4 lsb differential nonlinearity (1) dnl guaranteed monotonic over all codes 1 lsb zero code error all 0s loaded to dac 0 1 5 ma offset error @ code 16 0.5 ma offset error drift (2) 10 a/ ?? gain error drift (2) 0.2 0.5 lsb/ ?? output characteristics isink min iomin 3 ma isink max iomax 100 ma isink xshutdown ioxd isink @ en 80 na output compliance ocmr output voltage range (isink form 0ma to 100ma) 0.65 vdd v power up time vdd=5v to 10% of fs, coming out of power down mode 35 s logic input of i 2 c (2) low voltage v inl vdd from 2.3v to 5.5v -0.3 +0.54 v high voltage v inh vdd from 2.3v to 5.5v 1.26 v dd +0.3 v input current i in vin from 0v to vdd 1 a input hysteresis v hyst 0.05v dd v input capacitance c in 6 pf glitch rejection pulse width of spike suppressed 50 ns logic inputs of en low voltage v inl 0.54 v high voltage v inh 1.3 v input current i in 1 a pin capacitance 3 pf n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 5 electrical characteristics (continued) v dd from 2.3v to 5.5v, load resistance r l =25? connected to v dd full operating temperature range (ta from -40 j to +85 j ) unless otherwise noted. eum6820 parameter symbol conditions min. typ. max. unit ac characteristics output current settling time v dd =3.6v,r l =25? ,l l =680h, 30ma to 75ma change 250 s slew rate 1.8 ma/s major code change glitch impulse 1 lsb change around major carry 0.15 na-s digital feedthrough 0.06 na-s note: (1) linearity is tested using a redu ced code range: code 32 to code 1023. (2) guaranteed by design and characteri zation; not production tested. en is active low. sda and scl pull-up resistors are tied to 1.8v. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 6 typical performance characteristics dnl v dd =3.6v temp=25 j typical dnl vs. code figure 4. inl v dd =3.6v temp=25 j typical inl vs. code plot figure 3. v dd =3.6v i-sink@+25c i-sink@+85c i-sink@-40c sink current vs. code vs. temperature figure 7. positive inl (v dd =2.8v) positive inl (v dd =3.6v) negative inl (v dd =2.8v) negative inl (v dd =3.6v) inl vs. temperature vs. supply voltage figure 8. 1/4 to 3/4 scale settling time figure 5. v dd =3.6v settlin g time for a 100-lsb step figure 6. v dd =3.6v n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 7 negative inl (v dd =3.6v) negative inl (v dd =2.8v) positive dnl (v dd =2.8v) positive dnl (v dd =3.6v) dnl vs. temperature vs. supply voltage figure 9. v dd =3.6v v dd =2.8v zero-code error vs. suppl y volta g e vs. temperature figure 10. v dd =3.6v v dd =2.8v full-scale error vs. temperature vs. supply voltage figure 11. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 8 terminology of ec table 1. relative accuracy (inl) relative accuracy (inl) is calculated by measuring the worse case deviation from a straight line which is defined from end points. the straight line end points are the actual measured values at 0 code and 1023 code. a65.97 in 1023 ii i inl 0 0 1023 n n ? ? ? ? ? ? + ? ? = )max(inl inl n = 1023,......,0n = figure 12. relative accuracy 2. differential nonlinearity (dnl) differential nonlinearity (dnl) is the difference between the measured change and the idea l 1 lsb change of any two adjacent codes. the slope of the output line must be positive for each incremental step to guarante monotonic. ) max(dnl dnl n = 1023,......,33n = 3. zero-code error zero-code error is a measurement of isink @ 0 code. ideally, it is 0 ma. 4. gain error gain error is the difference in the slopes of the ideal transfer function and the actual transfer function. it is expressed as a percent of the full-scale range a65.97 a65.97ii dnl 1nn n ?? = ? () 00 0 16 1023 1000 1023 1.0 1023 1.0 1007 ii error_gain ? ? = n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 9 figure 13. gain error 5. gain error drift the change in slope of the transfer function due to temperature, expressed as lsb/c. 6. offset error offset error of eum6820 is the difference between the actual i sink @ 16 code the ideal i sink @ 16 code. 7. offset error drift the change of offset error due to temperature, expressed as v/c. timing specifications v dd =2.3v to 5.5v. full operating temperature range (ta from -40 j to 85 j ) unless otherwise noted. f scl 400 khz max scl clock frequency t 1 2.5 s min scl cycle time t 2 0.6 s min t high , scl high time t 3 1.3 s min t low , scl low time t 4 0.6 s min t hd, sta , start/repeated start condition hold time t 5 100 ns min t su, dat , data setup time t 6 0.9 s max t hd, dat , data hold time 0 s min t 7 0.6 s min t su, sta , setup time for repeated start t 8 0.6 s min t su, sto , stop condition setup time t 9 1.3 s min t buf , bus free time between a stop condition and a start condition t 10 300 ns max t r, rise time of both scl and sda when receiving 0 ns min may be cmos driven t 11 250 ns max t f , fall time of sda when receiving 300 ns max t f , fall time of both scl and sda when transmitting 20 + 0.1 c b3 ns min c b 400 pf max capacitive load for each bus line n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 10 figure 14. i 2 c interface timing diagram serial interface eum6820 uses i 2 c interface. system can write or read from data to dac at the rates of up to 400 khz. i 2 c bus operation this is a serial interface that uses two bus lines, scl and sda, to access the internal control registers. the master generates the serial clock (scl) and reads/write data on th e serial data line (sda) from/to slave devices such as the eum6820. all devices on an i 2 c bus have their sda pin connected to the sda line and their scl pin connected to the scl line of the master device. i 2 c devices can pull the bus lines low; but pulling high is only achieved by pull-up resistors, rp. the value of rp the value of rp depends on the data rate, bus capacitance, and the maximum load current that the i 2 c device can sink (3 ma for a standard device). figure 15. typical i 2 c bus rp will pull the bus lines (scl and sda) high when the bus is idle. the control sequence of the communication through the i 2 c interface is composed of severa l steps in the following sequence: 1. start condition. defined by a negative edge on the sda line, while scl is high. 2. address: 7 bits of address, plus 1 bit to indicate write (0) or read (1), and an acknowledge bit. the write address of eum6820 is 00011000 (0x18). the read address of eum6820 is 00011001(0x19). 3. data: two blocks of eight bits will be written to eum6820 when a write operation occurs, or read from it when a read operation occurs. at the end of a read or write operation, the eum6820 acknowledges the second data bytes. 4. stop condition. defined by a positive edge on the sda line, while scl is high. sda can only be changed while scl is low but to indicate a start or stop condition. it is possible for the start or stop condition to occur at any time during a data transfer. data format high byte of the data is written to eum6820 first, then the lower byte. after all data is shifted into the 16 bit input register, it will be transferred to the dac register. the msb is reserved for an active-high, power-down function. bit 14 is unused. bit 13 to bit 4 correspond to the 10-bit dac data which controls the output current. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 11 figure 16. write operation figure 17. read operation table 1: data format msb lsb bits d7 d6 d5 d4 d3 d2 d1 d0 d7 d6 d5 d4 d3 d2 d1 d0 input register r15 r14 r13 r12 r11 r10 r9 r8 r7 r6 r5 r4 r3 r2 r1 r0 func pd fl r9 r8 r7 r6 r5 r4 r3 r2 r1 r0 s3 s2 s1 s0 data is written to the eum6820 high byte first, msb first, and is shifted into the 16-bit input register. until all data is shifted in, data from the input register is transferred to the dac register. bit 15, the pd bit is a software power down enable. eum6820 output is disabled and the chip goes into shut-down mode, when pd is set to high. bit 14 is unused; bit 13 to bit 4 correspond to the 10 bits dac data, b9 to b0. power supply bypassing and grounding decouple the power supply of eum6820. a tantalum bead type capacitor of 10f between vdd and gnd to decouple the power supply is recommended. a 0.1f(or more) ceramic capacitor is needed to provide a low impedance path to ground for high transient currents. this ceramic capacitor s hould be put as close as possible to the vdd pin and should has a low effective series resistan ce and effective series inductance. the power supply line should be large enough to provide a low impedance path and reduce glitch effects on the supply line. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 12 figure 18. effect of pcb trace resistance and inductance. output compliance voltage the output nmos of eum6820 need work in the propriety operation region to make i sink accurate. a incorrect voltage of i sink pin will cause i sink operate impropriety and i sink may not be maintained as a constant. if i sink is 100ma, the minimum vds of output nmos should be 200mv and the voltage drop across r sense is 330mv. so, the output compliance voltage of eum6820 is 530mv @ 100ma. if i sink pin voltage is below 550mv, i sink will become smaller and no longer be 100ma. if i sink is 90ma, the minimum vds of output nmos should be 180mv and the voltage drop across r sense is 297mv. so, the output compliance voltage of eum6820 is 480mv @ 90ma. if i sink pin voltage is below 480mv, i sink will become smaller and no longer be 90ma. because the parasitic resistor of pcb will effect the output compliance voltage drop, special attention should be paid to the layout of the gnd and the layout of the path between voice coil motor and i sink pin to minimize series resistance. also, the parasitic resistor of voice coil motor should be choosed exactly to make i sink correct and constant. if i sin k is 100ma, the rc of vcm should be smaller than the value calculated as below, if isink is 90ma, the rc of vcm should be smaller than the value calculated as below, ()() [] ( ) [ ] ma90 rrma90mv480v i ririvv r gt bat sink g sink t sink drop bat c + + ? = ++? applications information eum6820 can drive spring-preloaded motor or nonspring linear mo tors. these motors are applied in applications such as lens auto-focus, optical zoom and so on. spring-preloaded motor is controlled by the balancing of a voice coil and spring.if voice coil current increases, the strength of voice coil increases and the motor moves to a certain direction. during the motor moving, the strength of spring increases and finally be equated with the coil strength. when balance of these to strength are achieved, motor stop moving.on the contrary, if voice coil current decreases, the strength of voice coil decreases and the motor moves to a opposite direction. during the motor moving, the strength of spring decreases and finally be equated with the coil strength. then motor stop moving. figure 10 is transfer curve of a certain spring preloaded motor for autofocus. a start (or threshold) current of tpy 20ma is needed to move the moror because the strength of spring is not zero at 0mm. the current sink capability of eum6820 is up to 100 ma and more than adequate ()() [] ( ) [ ] ma100 rrma100mv550v i ririvv r gt bat sink g sink t sink drop bat c + + ? = ++? n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 13 for available commercial linear motors or voice coils. eum6820 guarantees monotonicity at all codes. this makes the eum6820 the ideal solution for applications of auto focus and lens positioning. figure 19.voice coil stroke vs. isink current n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eum6820 ds6820 ver1.0 oct. 2009 14 packaging information wcsp-6 millimeters inches symbols min. max. min. max. a - 0.675 - 0.027 a1 0.15 0.35 0.006 0.014 d 1.45 1.55 0.057 0.061 d1 0.50 0.020 e 0.95 1.05 0.037 0.041 e1 0.50 0.020 bottom view (ball side up) top view (ball side down) a b c 1 2 e d a a1 d1 e1 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com

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