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1/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. system lens driver series for digital still cameras / single-lens reflex cameras 7ch system lens drivers for digital still cameras / single-lens reflex cameras bd6757kn, bd6889gu description bd6757kn and bd6889gu motor drivers provide 6 full-on driv e h-bridge channels and 1 line ar constant-current drive h-bridge channel. stepping motors can be used for the auto fo cus, zoom, and iris, making it possible to configure a sophisticated, high precision lens drive system. rohm?s motor drivers are both compact, multifunctional, and enable advanced features such as lens barrier and anti shock. features 1) subminiature grid array package: 5.0 ? 5.0 ? 1.2mm 3 (bd6889gu) 2) dmos output allowing a range power supply: 2.0v to 8.0v (bd6757kn) 3) low on-resistance power mos output: full-on drive block with 1.3 ? typ. and linear constant-current drive block with 0.9 ? typ. (bd6757kn, bd6889gu) 4) built-in two digital npn transistor circuits for photo-interrupter waveform shaping: input-dividing type with output pull-up resistance (bd6757kn) 5) built-in four digital npn transistor circuits for photo-interrupter waveform shaping: input-dividing type with output pull-up resistance (bd6889gu) 6) built-in four digital pnp transistor circuits for photo-interrupter waveform shaping: input-dividing type with output pull-down resistance (bd6889gu) 7) built-in voltage-regulator circ uit for photo-interrupter (bd6889gu) 8) built-in two-step output current setting switch for the linear constant-current drive block (bd6757kn) 9) 0.9v2% high-precision reference voltage output 10) constant-current drive block features phase compensation capacitor-free design 11) built-in 3% high-precision linear constant-current driver 12) built-in charge pump circuit for the dmos gate voltage drive(bd6757kn) 13) uvlo (under voltage lockout protection) function 14) built-in tsd (thermal shut down) circuit 15) standby current consumption: 0 a (typ.) absolute maximum ratings parameter symbol limit unit bd6757kn bd6889gu power supply voltage vcc -0.5 to +7.0 -0.5 to +7.0 v motor power supply voltage vm -0 .5 to +10.0 -0.5 to +7.0 v charge pump voltage vg 15.0 none v control input voltage vin -0.5 to vcc+0.5 -0.5 to vcc+0.5 v power dissipation pd 950 1 980 2 mw operating temperature range topr -25 to +75 -25 to +85 c junction temperature tjmax +150 +150 c storage temperature range tstg -55 to +150 -55 to +150 c h-bridge output current iout -800 to +800 3 -800 to +800 3 ma/ch 1 reduced by 7.6mw/c over 25c, when mounted on a glass epoxy board (70mm ? 70mm ? 1.6mm). 2 reduced by 7.84mw/c over 25c, w hen mounted on a glass epoxy board (70mm ? 70mm ? 1.6mm). 3 must not exceed pd, aso, or tjmax of 150c. operating conditions (ta=-25 to +75 c(bd6757kn), -25 to +85c(bd6889gu)) parameter symbol limit unit bd6757kn bd6889gu power supply voltage vcc 2.5 to 5.5 2.5 to 5.7 v motor power supply voltage vm 2.5 to 8.0 2.5 to 5.7 v control input voltage vin 0 to vcc 0 to vcc v h-bridge output current iout -500 to +500 4 -500 to +500 4 ma/ch 4 must not exceed pd or aso. no.09014eat04
bd6757kn, bd6889gu technical note 2/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. electrical characteristics 1) bd6757kn electrical characteristics (unless ot herwise specified, ta=25c, vcc=3.0v, vm=5.0v) parameter symbol limit unit conditions min. typ. max. overall circuit current during standby operation iccst - 0 10 a ps=0v circuit current icc - 1.0 3.0 ma ps=vcc with no signal control input (in=ps, in1a to in7b, and limsw) high level input voltage vinh 2.0 - - v low level input voltage vinl - - 0.7 v high level input current iinh 15 30 60 a vinh=3v low level input current iinl -1 0 - a vinl=0v pull-down resistor rin 50 100 200 k ? charge pump charge pump voltage vcp 10 11 - v uvlo uvlo voltage vuvlo 1.6 - 2.4 v full-on drive block (ch1 to ch6) output on-resistance ron - 1.3 1.6 ? io=400ma on high and low sides in total pulse input response tp 100 - - ns with an input pulse with of 200ns linear constant-current drive block (ch7) output on-resistance ron - 0.9 1.1 ? io=400ma on high and low sides in total vref output voltage vref 0.88 0.90 0.92 v iout=0~1ma output limit current 1 iol1 388 400 412 ma rnf=0.5 ? with a load of 10 ? vlimh(l)=0.2v, limsw=0v(3v) output limit current 2 iol2 285 300 315 ma rnf=0.5 ? with a load of 10 ? vlimh(l)=0.15v, limsw=0v(3v) 5 output limit current 3 iol3 190 200 210 ma rnf=0.5 ? with a load of 10 ? vlimh(l)=0.1v, limsw=0v(3v) 5 digital npn transistor block for photo-interrupter waveform shaping input current isih - - 0.1 ma six=3v low level output voltage vsol - 0.1 0.25 v six=3v, iso=0.5ma input dividing resistance rsil 70 100 130 k ? output pull-up resistance rsoh 5 10 20 k ? input dividing resistance comparison - 0.8 1.0 1.2 - division resistance comparison between six and gnd 5 5 design target value (not all shipped devices are fully tested.)
bd6757kn, bd6889gu technical note 3/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. 2) bd6889gu electrical characteristics (unless ot herwise specified, ta=25c, vcc=3.0v, vm=5.0v) parameter symbol limit unit conditions min. typ. max. overall circuit current during standby operation iccst - 0 10 a ps=0v circuit current icc - 1.5 3.0 ma ps=vcc with no signal control input (in=ps, in1a to in7b, sw, dsw, dsel1, and dsel2) high level input voltage vinh 2.0 - - v low level input voltage vinl - - 0.7 v high level input current iinh 15 30 60 a vinh=3v low level input current iinl -1 0 - a vinl=0v pull-down resistor rin 50 100 200 k ? uvlo uvlo voltage vuvlo 1.6 - 2.4 v full-on drive block (ch1 to ch6) output on-resistance ron - 1.3 1.6 ? io=400ma on high and low sides in total pulse input response tp 100 - - ns with an input pulse with of 200ns linear constant-current drive block (ch7) output on-resistance ron - 0.9 1.1 ? io=400ma on high and low sides in total vref output voltage vref 0.88 0.90 0.92 v iout=0~1ma output limit current 1 iol1 388 400 412 ma rnf=0.5 ? with a load of 10 ? , vlim=0.2v output limit current 2 iol2 285 300 315 ma rnf=0.5 ? with a load of 10 ? , vlim=0.15v output limit current 3 iol3 190 200 210 ma rnf=0.5 ? with a load of 10 ? , vlim=0.1v digital npn transistor block for photo-interrupter waveform shaping input current isih - - 0.1 ma six=3v low level output voltage vsol - 0.1 0.25 v six=3v, iso=0.5ma input dividing resistance rsin 70 100 130 k ? output pull-up resistance rsoh 23 33 43 k ? input dividing resistance comparison - 0.8 1.0 1.2 - division resistance comparison between six and gnd 6 digital pnp transistor block for photo-interrupter waveform shaping input current isil -0.1 - - ma six=0v high level output voltage vsoh vcc-0.25 vcc-0.1 - v six=0v, iso=-0.5ma input dividing resistance rsip 70 100 130 k ? output pull-down resistance rsol 23 33 43 k ? input dividing resistance comparison - 0.8 1.0 1.2 - division resistance comparison between six and vcc 6 voltage-regulator for photo-interrupter high level output voltage vregh vcc-0.25 vcc-0.2 - v ireg=100ma output on-resistance ronreg - 2 2.5 ? ireg=100ma output leak current ilpi - 0 1 a sw=vcc 6 design target value (not all shipped devices are fully tested.)
bd6757kn, bd6889gu technical note 4/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. electrical characteristic diagrams 0 50 100 150 200 250 0 50 100 150 200 250 vlim voltag e : vlim [mv] rnf voltage : vrnf [mv] fig.9 output limit voltage (rnf=0.5 ? ) bd6757kn, bd6889gu top 85 c mid 25c low -25c 0.0 1.0 2.0 3.0 4.0 5.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 supply voltag e : vcc [v] circuit current : icc [ma] fig.3 circuit current bd6757kn op. range (2.5v to 5.5v) top 75 c mid 25c low -25c 0 250 500 750 1000 1250 0 25 50 75 100 125 150 ambient temperatur e : ta [c] power dissipation : pd [mw] fig.1 power dissipation reduction bd6757kn 940mw 570mw 75c 0 250 500 750 1000 1250 0 25 50 75 100 125 150 ambient temperatur e : ta [c] power dissipation : pd [mw] fig.2 power dissipation reduction bd6889gu 980mw 510mw 85c 0.0 1.0 2.0 3.0 4.0 5.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 supply voltag e : vcc [v] circuit current : icc [ma] fig.4 circuit current bd6889gu op. range (2.5v to 5.7v) top 85 c mid 25c low -25c 0.0 1.0 2.0 3.0 4.0 5.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 supply voltag e : vm [v] output on resistance : ron [ ? ] fig.7 output on-resistance (full-on drive block) bd6889gu op. range (2.5v to 5.7v) top 85 c mid 25c low -25c 0.0 1.0 2.0 3.0 4.0 5.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 supply voltag e : vg [v] output on resistance : ron [ ? ] fig.5 output on-resistance (full-on drive block) bd6757kn top 75 c mid 25c low -25c 0.0 1.0 2.0 3.0 4.0 5.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 supply voltag e : vg [v] output on resistance : ron [ ? ] fig.6 output on-resistance (linear constant-current drive block) bd6757kn top 75 c mid 25c low -25c 0.0 1.0 2.0 3.0 4.0 5.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 supply voltag e : vm [v] output on resistance : ron [ ? ] fig.8 output on-resistance (linear constant-current drive block) bd6889gu top 85 c mid 25c low -25c op. range (2.5v to 5.7v)
bd6757kn, bd6889gu technical note 5/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. pin arrangement and pin function fig.10 bd6757kn pin arrangement (top view) uqfn52 package bd6757kn pin function table no. pin name function no. pin name function 1 in7b control input pin ch7 b 27 in2a control input pin ch2 a 2 vm4 motor power supply pin ch7 28 in2b control input pin ch2 b 3 in7a control input pin ch7 a 29 in3a control input pin ch3 a 4 gnd ground pin 30 vm2 motor power supply pin ch3 and ch4 5 vref reference voltage output pin 31 cp1 charge pump capacitor connection pin 1 6 vlimh output current setting pin 1 ch7 32 cp2 charge pump capacitor connection pin 2 7 vliml output current setting pin 2 ch7 33 cp3 charge pump capacitor connection pin 3 8 limsw output current setting selection pin c h7 34 cp4 charge pump capacitor connection pin 4 9 vcc power supply pin 35 vg charge pump output pin 10 vm1 motor power supply pin ch1 and ch2 36 vm3 motor power supply pin ch5 and ch6 11 ps power-saving pin 37 in3b control input pin ch3 b 12 in6b control input pin ch6 b 38 in4a control input pin ch4 a 13 in6a control input pin ch6 a 39 in4b control input pin ch4 b 14 in5b control input pin ch5 b 40 si1 digital transistor input pin 1 15 in5a control input pin ch5 a 41 si2 digital transistor input pin 2 16 out1a h-bridge output pin ch1 a 42 out5a h-bridge output pin ch5 a 17 out1b h-bridge output pin ch1 b 43 out5b h-bridge output pin ch5 b 18 out2a h-bridge output pin ch2 a 44 pgnd2 motor ground pin ch5 and ch6 19 out2b h-bridge output pin ch2 b 45 out6a h-bridge output pin ch6 a 20 pgnd1 motor ground pin ch1 to ch4 46 out6b h-bridge output pin ch6 b 21 out3b h-bridge output pin ch3 b 47 out7a h-bridge output pin ch7 a 22 out3a h-bridge output pin ch3 a 48 rnf resistance connection pin for output current detection ch7 23 out4b h-bridge output pin ch4 b 49 out7b h-bridge output pin ch7 b 24 out4a h-bridge output pin ch4 a 50 sense output current detection pin ch7 25 in1a control input pin ch1 a 51 so2 digital transistor output pin 2 26 in1b control input pin ch1 b 52 so1 digital transistor output pin 1 bd6757kn 52 39 13 26 si1 si2 out5a out5b pgnd2 out6a out6b out7a rnf out7b sense so2 so1 in1b in1a out4a out4b out3a out3b pgnd1 out2b out2a out1b out1a in5a in5b in4b in4a in3b vm3 vg cp4 cp3 cp2 cp1 vm2 in3a in2b in2a in7b vm4 in7a gnd vref vlimh vliml limsw vcc vm1 ps in6b in6a
bd6757kn, bd6889gu technical note 6/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. fig.11 bd6889gu pin arrangement (top view) vbga063t050 package bd6889gu pin function table no. pin name function no. pin name function a1 n.c. - e1 rnf resistance connection pin for output current detection ch7 a2 out6a h-bridge output pin ch6 a e2 dsel 1 selection pin for transistor output 1 a3 out6b h-bridge output pin ch6 b e3 in1a control input pin ch1 a a4 vm3 motor power supply pin ch5 and ch6 e4 in1b control input pin ch1 b a5 pgnd3 motor ground pin ch5 and ch6 e5 in4b control input pin ch4 b a6 out5b h-bridge output pin ch5 b e6 in4a control input pin ch4 a a7 out5a h-bridge output pin ch5 a e7 so3n npn transistor output pin 3 a8 n.c. - e8 pgnd2 motor ground pin ch3 and ch4 b1 f1 sense output current detection pin ch7 b2 dsw enable input pin for transistor f2 vlim output current setting ch7 b3 in6a control input pin ch6 a f3 in2a control input pin ch2 a b4 in6b control input pin ch6 b f4 si1 digital transistor input pin 1 b5 so4p pnp transistor output pin 4 f5 si2 digital transistor input pin 2 b6 so4n npn transistor output pin 4 f6 in3a control input pin ch3 a b7 reg regulator output pin for pi f7 in3b control input pin ch3 b b8 out4a h-bridge output pin ch4 a f8 out3b h-bridge output pin ch3 b c1 out7a h-bridge output pin ch7 a g1 out7b h-bridge output pin ch7 b c2 sw regulator input pin for pi g2 gnd ground pin c3 dsel2 selection pin for transistor output 2 g3 in2b control input pin ch2 b c4 in7a control input pin ch7 a g4 so1p pnp transistor output pin 1 c5 si4 digital transistor input pin 4 g5 so1n npn transistor output pin 1 c6 in5a control input pin ch5 a g6 so2p pnp transistor output pin 2 c7 ps power-saving pin g7 so2n npn transistor output pin 2 c8 out4b h-bridge output pin ch4 b g8 out3a h-bridge output pin ch3 a d1 vm4 motor power supply pin ch7 h1 n.c. - d2 vcc power supply pin h2 out1a h-bridge output pin ch1 a d3 vref reference voltage output pin h3 out1b h-bridge output pin ch1 b d4 in7b control input pin ch7 b h4 pgnd1 motor ground pin ch1 and ch2 d5 in5b control input pin ch5 b h5 vm1 motor power supply pin ch1 and ch2 d6 si3 digital transistor input pin 3 h6 out2b h-bridge output pin ch2 b d7 so3p pnp transistor output pin 3 h7 out2a h-bridge output pin ch2 a d8 vm2 motor power supply pin ch3 and ch4 h8 n.c. - 1 2 3 4 5 6 7 8 a n.c. out6a out6b vm3 pgnd3 out5b out5a n.c. b dsw in6a in6b so4p so4n reg out4a c out7a sw dsel2 in7a si4 in5a ps out4b d vm4 vcc vref in7b in5b si3 so3p vm2 e rnf dsel1 in1a in1b in4b in4a so3n pgnd2 f sense vlim in2a si1 si2 in3a in3b out3b g out7b gnd in2b so1p so1n so2p so2n out3a h n.c. out1a out1b pgnd1 vm1 out2b out2a n.c.
bd6757kn, bd6889gu technical note 7/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. application circuit diagram 1100uf vm4 out6a out6b bypass filter capacitor for power supply input. (p.14/16) vcc 1 100uf 9 charge pump charge pump cp1 31 cp2 32 cp3 33 cp4 34 vg 35 0.1 f 0.1 f 0.1 f ps out1a out1b level shift & pre driver out2a out2b h bridge full on h bridge full on m in1a bandgap tsd & uvlo 11 16 17 18 19 1100uf vm1 10 out3a out3b level shift & pre driver out4a out4b h bridge full on h bridge full on m 22 21 24 23 30 pgnd1 20 vm2 in1b logic12 25 26 in2a in2b 27 28 logic12 in3b 29 37 in4a in4b 38 39 in3a logic34 bypass filter capacitor for power supply input. (p.14/16) bypass filter capacitor for power supply input. (p.14/16) power-saving (p.9/16) h : active l : standby motor control input (p.9/16) motor control input (p.9/16) bypass filter capacitor for power supply input. (p.14/16) output current selection (p.9/16) h : vliml l : vlimh level shift & pre driver rnf 0.1 ? ~5.0 ? out7a out7b h bridge const. current 47 49 48 in7a 3 in7b 1 logic7 sense 50 4 vref limsw vlimh vliml selector vref 5 6 7 8 r 2 r 3 r 1 the output current is converted to a voltage with the rnf external resistor and transmitted to the sense pin. (p.9/16) iout[a] = (vlimh or vliml[v]) rnf[ ? ] motor control input (p.9/16) when using the vref voltage (0.9v) resistance division value as vlimh and vliml input value, select r 1 , r 2 , and r 3 values such that, 1k ? Q r 1 +r 2 +r 3 Q 20k ? (p.9/16) fig.12 bd6757kn application circuit diagram power save out5a out5b h bridge full on h bridge full on m 42 43 45 46 1100uf 36 pgnd2 44 vm3 in5b 15 14 in6a in6b 13 12 in5a logic56 bypass filter capacitor for power supply input. (p.14/16) motor control input (p.9/16) 1100uf 2 vg vg vg level shift & pre driver vg vg vcc 40 si1 52 so1 vcc 41 si2 51 so2 gnd the sensor signal si2, for lens position detection, is reshaped and output to so2. p.10/16 the sensor signal si1, for lens position detection, is reshaped and output to so1. p.10/16 osc
bd6757kn, bd6889gu technical note 8/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. r 2 vm4 out6a out6b ps out1a out1b out2a out2b h bridge full on h bridge full on m in1a bandgap tsd & uvlo c7 h2 h3 h7 h6 1100uf vm1 h5 pgnd1 h4 out3a out3b out4a out4b h bridge full on h bridge full on m g8 f8 b8 c8 1100uf d8 pgnd2 e8 vm2 in1b logic12 e3 e4 in2a in2b f3 g3 logic12 in3b f6 f7 in4a in4b e6 e5 in3a logic34 bypass filter capacitor for power supply input. (p.14/16) bypass filter capacitor for power supply input. (p.14/16) power-saving (p.9/16) h : active l : standby motor control input (p.9/16) motor control input (p.9/16) bypass filter capacitor for power supply input. (p.14/16) rnf 0.1 ? ~5.0 ? out7a out7b h bridge const. current c1 g1 e1 in7a c4 in7b d4 logic7 sense f1 g2 motor control input (p.9/16) when using the vref voltage (0.9v) resistance division value as vlim input value, select r 1 and r 2 values such that, 1k ? Q r 1 +r 2 Q 20k ? (p.9/16) fig.13 bd6889gu application circuit diagram power save out5a out5b h bridge full on h bridge full on m a 7 a 6 a 2 a 3 1100uf a 4 pgnd3 a 5 vm3 in5b c6 d5 in6a in6b b3 b4 in5a logic56 bypass filter capacitor for power supply input. (p.14/16) motor control input (p.9/16) 1100uf d1 gnd the sensor signal si2, for lens position detection, is reshaped and output to so2x. (p.10/16) vcc 1 100uf d2 bypass filter capacitor for power supply input. (p.14/16) level shift & pre driver level shift & pre driver level shift & pre driver the output current is converted to a voltage with the rnf external resistor and transmitted to the sense pin. (p.9/16) iout[a] = vlim[v] rnf[ ? ] vlim f2 vref vref d3 r 1 vcc vcc vcc sw sw so1n f4 so1p g4 g5 si1 vcc vcc vcc sw sw so2n f5 so2p g6 g7 si2 vcc vcc vcc sw sw so3n d6 so3p d7 e7 si3 vcc vcc vcc sw sw so4p b5 so4n b6 si4 c5 reg reg reg reg level shift & pre driver vcc sw c2 reg b7 dsel1 dsel2 e2 c3 b2 dsw dtr selector digital transistor sw selector for digital transistor (p.10/16) reg switch (p.10/16) h : reg output on l : reg output off power supply for photo interrupter (p.10/16) the sensor signal si1, for lens position detection, is reshaped and output to so1x. (p.10/16) the sensor signal si3, for lens position detection, is reshaped and output to so3x. (p.10/16) the sensor signal si4, for lens position detection, is reshaped and output to so4x. (p.10/16)
bd6757kn, bd6889gu technical note 9/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. function explanation 1) power-saving function when low-level voltage is applied to ps pin, the ic will be turned off internally and the circuit current will be 0 a (typ.). during operating mode, ps pin should be high-level. (s ee the electrical characteri stics; p.2/16 and p.3/16) 2) motor control input (1) inxa and inxb pins these pins are used to program and control the motor drive modes. the full-on drivers and the linear constant-current driver use in/in and en/in input modes, re spectively. (see the electrical characte ristics; p.2/16 and p. 3/16, and i/o truth table; p.10/16) 3) h-bridge the 7-channel h-bridges can be controlled independently. fo r this reason, it is possible to drive the h-bridges simultaneously, as long as the package thermal tolerances are not exceeded. the h-bridge output transistors of the bd6757kn and bd6889gu consist of power dmos, with the charge pump step-up power supply vg, and power cmos, with the motor power supply vm, respectively. the total h-bridge on-resistance on the high and low sides varies with the vg and vm voltages, respectively. the system must be designed so that the maximum h-bridge current for each channel is 800ma or below. (see the operating conditions; p.1/16) 4) drive system of linear constant-current h-bridge (bd6757kn: ch7 and bd6889gu: ch7) bd6757kn (ch7) and bd6889gu (ch7) enable linear constant-current driving. (1) reference voltage output (with a tolerance of 2%) the vref pin outputs 0.9v, based on the internal reference vo ltage. the output current of the constant-current drive block is controllable by connecting external resistance to t he vref pin of the ic and applying a voltage divided by the resistor to the output current setting pins. (bd6757kn: vlimh and vliml pins, bd6889gu: vlim pin) it is recommended to set the external resistance to 1k ? or above in consideration of the current capacity of the vref pin, and 20k ? or below in order to minimize the fluctuation of t he set value caused by the base current of the internal transistor of the ic. (2) output current settings and setting changes (bd6757kn) when the low-level control voltage is applied to the limsw pin, the value on the vlimh pi n will be used as an output current set value to control the output current. when the high- level control voltage is applied to the limsw pin, the value on the vliml pin will be used as an output current set value to control the output current. (see the electrical characteristics; p.2/16) (3) output current detection and current settings by connecting external resistor (0.1 ? to 5.0 ? ) to the rnf pin of the ic, the motor drive current will be converted into voltage in order to be detected. t he output current is kept constant by shorting the rnf and sense pins and comparing the voltage with the vlimh or vliml voltage (vlim voltage in the case of the bd6889gu). to perform output current settings more precisely, trim the external rnf resistance if needed, and supply a precise voltage externally to the vlimh or vliml pin of the ic (vlim pin in the ca se of the bd6889gu). in that case, open the vref pin. ?????? (1) the output current is 400ma ? 3% if 0.2v is applied to the vlimh or vliml pin (vlim pin in the case of the bd6889gu) and a 0.5 ? resistor is connected externally to the rnf pin. if the vlimh and vliml pins (vlim pin in the case of the bd 6889gu) are shorted to the v cc pin (or the same voltage level as the vcc is applied) and the sense and rnf pins are shorted to the ground, this channel can be used as a full-on drive h-bridge like the other six channels. 5) charge pump (bd6757kn) each output h-bridge of the bd6757kn on the high and low si des consists of nch dmos. t herefore, the gate voltage vg should be higher than the vm voltage to drive the nch dmos on the high side. the bd6757kn has a built-in charge pump circuit that genera tes vg voltage by connecting an external capacitor (0.01 f to 0.1 f). if a 0.1 f capacitor is connected between: cp1 and cp2, cp3 and cp4, vg and gnd then, vg pin output voltage will be: vm1 + (vcc ? 2) if a 0.1 f capacitor is connected between: cp1 and cp2, vg and gnd cp4 and vg pins are shorted, and cp3 pin is open then, vg pin output voltage will be: vm1 + vcc the vm1 to vm4 respectively can be set to voltages differen t to one another. in order to ensure better performance, the voltage differential between vg and vm must be 4.5v or higher, and the vg voltage must not exceed the absolute maximum rating of 15v. vlimh[v] or vliml[v] rnf[ ? ] vlim[v] rnf[ ? ] select vlimh when limsw is low-level select vliml when limsw is high-level output current value iout[a] = (bd6757kn) (bd6889gu)
bd6757kn, bd6889gu technical note 10/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. 6) digital transistor for photo-interrupt er waveform shaping (bd6757kn and bd6889gu) the bd6757kn, and bd6889gu build in two digital npn transistor circuits, and eight digital npn and pnp transistor circuits for photo-interrupter waveform shaping, respectively . the sensor signal, for lens position detection, is reshaped and output to the dsp. the input (six pin) is a dividing resistance type, a nd provided with npn output (soxn pin) pull-up resistor and pnp output (soxp pin) pull-down resistor. this is so that vcc, and gnd voltage will be npn output, and pnp output, respectively, when the input is open. in the case of the bd6889gu, dsw, dsel1, and dsel2 pins can control the switching of npn and pnp transis tor. the inputs are provided with input pull-down resistor. this is so that gnd voltage will be input, when these three pi ns are open. (see i/o truth table; p.12/16) 7) voltage-regulator for photo-interrupter (bd6889gu) the bd6889gu builds in voltage-regulator circuits for photo-interrupter. when high-level voltage is applied to sw pin, the reg pin will be turned on. the input is provided with input pul l-down resistor. this is so that reg pin will be turn off, when the input is open. i/o truth table bd6757kn and bd6889gu fu ll-on driver ch1 to ch6 i/o truth table drive mode input output output mode inxa inxb outxa outxb in/in l l z z standby h l h l cw l h l h ccw h h l l brake l: low, h: high, x: d on't care, z: high impedance at cw, current flows from outa to outb. at ccw, current flows from outb to outa. bd6757kn and bd6889gu line ar constant-current dr iver ch7 i/o truth table drive mode input output output mode in7a in7b out7a out7b en/in l x z z standby h l h l cw h h l h ccw l: low, h: high, x: d on't care, z: high impedance at cw, current flows from outa to outb. at ccw, current flows from outb to outa. bd6889gu digital transistor i/o truth table input output dsw dsel1 dsel2 pnp1 npn1 pnp2 npn2 pnp3 npn3 pnp4 npn4 logic l x x off off off off off off off off h l l off on off on off on off on h l h off on off on on off on off h h l on off on off off on off on h h h on off on off on off on off l: low, h: high, x: don?t care, off: gnd (in the case of pnp), vcc (in the case of npn) pnpx output to soxp terminal, npnx output to soxn terminal
bd6757kn, bd6889gu technical note 11/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. in the case of drive the stepping motor using ch1 and ch2 in/in input mode of the bd6757kn and bd6889gu 2 phases input output output mode ch1 / ch2 in1a in1b in2a in2b out1a out1b out2a out2b l l l l z z z z stand by h l h l h l h l 1. cw / cw l h h l l h h l 3. ccw / cw l h l h l h l h 5. ccw / ccw h l l h h l l h 7. cw / ccw l: low, h: high, x: d on't care, z: high impedance at cw, current flows from outa to outb. at ccw, current flows from outb to outa. 1-2 phases input output output mode ch1 / ch2 in1a in1b in2a in2b out1a out1b out2a out2b l l l l z z z z stand by h l h l h l h l 1. cw / cw l l h l z z h l 2. z / cw l h h l l h h l 3. ccw / cw l h l l l h z z 4. ccw / z l h l h l h l h 5. ccw / ccw l l l h z z l h 6. z / ccw h l l h h l l h 7. cw / ccw h l l l h l z z 8. cw / z l: low, h: high, x: d on't care, z: high impedance at cw, current flows from outa to outb. at ccw, current flows from outb to outa. fig.14 2 phases timing sequence with in/in input fig.15 1-2 phases timing sequence with in/in input h l h l h l h l h l h l h l h l in1a in1b in2a in2b out1a out1b out2a out2b high impedance h l h l h l h l h l h l h l h l in1a in1b in2a in2b out1a out1b out2a out2b 1 3 5 7 1 3 5 7 1 2 3 4 5 6 7 8 fig.17 torque vector of 1-2 phases mode out1a cw out1b ccw out2b ccw cw out2a 1 5 7 3 forward reverse 2 6 4 8 fig.16 torque vector of 2 phases mode out1a cw out1b ccw out2b ccw cw out2a 1 5 7 3 forward reverse
bd6757kn, bd6889gu technical note 12/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. i/o circuit diagram fig.18 bd6757kn i/o circuit diagram (res istance values are typical ones) vcc 10k ? vcc 100k ? ps, inxa, inxb, limsw vmx, outxa, outxb, pgndx, rnf vlimh, vliml, sense pgndx rnf outxa vmx outxb vcc vcc 50k ? vref vcc 10k ? cp3, cp1 sox cp4 cp2 vg vm1 six vg, cp4, cp2 vcc vcc vcc vcc 10k ? 100k ? vcc 100k ? pgndx rnf outxa vmx outxb vcc 10k ? vcc 100k ? ps, inxa, inxb, sw, dsw, dsel1, dsel2 vmx, outxa, outxb, pgndx, rnf vlim, sense vcc vcc 100k ? vref six soxp soxn reg vcc vcc 33k ? fig.19 bd6889gu i/o circuit diagram (resistance values are typical ones) vcc 1k ? vcc vcc 33k ? vcc vcc 100k ? 100k ? 100k ? 100k ? vcc vcc
bd6757kn, bd6889gu technical note 13/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. heat dissipation 1) power consumption the power consumption of the ic (pw) is expressed by the following formula. pw[w] = vcc[v] ? icc[a] + iout 2 [a 2 ] ? ron[? ] (full-on drive block and pwm constant-current drive block) ?????? (2) = vcc[v] ? icc[a] + iout[a] ? (vm[v] - vrnf[v] - iout[a] ? rm[ ? ]) (linear constant-current drive block) ?????? (3) pw: power consumption of the ic vcc: power supply voltage on the vcc pin icc: current consumption of the vcc pin iout: current consumption of the vm pin on the drive channel ron: total on-resistance on the high and low drive channel vm: power supply voltage on the vm pin on the drive channel vrnf: voltage on the rnf pin on the drive channel rm: resistance on the motor on the drive channel while in operation, check that t he junction temperature (tjmax) of t he ic will not be in excess of 150 , in consideration of formula (2), formula (3), the packag e power (pd), and ambient temperature (ta). if the junction temperature exceeds 150 , the ic will not work as a properly. this can cause problems , such as parasitic oscillation and temperature leakage. if the ic is used under such conditions, it will result in characteristic degradation and eventually fail. be sure to keep the junction temperature lower than 150 . 2) measurement method of junction temperature the junction temperature can be meas ured by the following method. by using the diode temperature characteri stics of the contro l input pin, on a channel that is not driven, the juncti on temperature x can be measured in a pseudo manner. the junction temperature x[ ] under certain conditions is expressed by formula (4), provided that the temperature char acteristic of the diode is -2 mv/ x[c] = + 25[c] ?????? (4) x: junction temperature a: the voltmeter v value at a junction temperature of 25 b: the voltmeter v value at a junction temperature of x -2: temperature characteristic of diode if the exact junction temperature is desired, it is necessary to measure the specif ic temperature characteristic of the internal diode, of each ic. notes for use 1) absolute maximum ratings use of the ic in excess of absolute maximum ratings such as the applied voltage or operating temperature range may result in ic damage. assumptions should not be made regarding the state of the ic (short mode or open mode) when such damage is suffered. the implementation of a physical safety measure such as a fuse should be considered when use of the ic in a special mode where the absolu te maximum ratings may be exceeded is anticipated. 2) storage temperature range as long as the ic is kept within this range, there shou ld be no problems in the ic?s performance. conversely, extreme temperature changes may result in poor ic performanc e, even if the changes are within the above range. 3) power supply pins and lines none of the vm line for the h- bridges is internally connected to the vcc po wer supply line, which is only for the control logic or analog circuit. therefore, the vm and vcc lines can be driven at differen t voltages. although these lines can be connected to a common power supply, do not open the power supply pin but connect it to the power supply externally. regenerated current may flow as a result of the motor's back electromotive force. insert capacitors between the power supply and ground pins to serve as a r oute for regenerated current. determine the ca pacitance in full consideration of all the characteristics of the electrolytic capacitor, because th e electrolytic capacitor may loose some capacitance at low temperatures. if the connected power supply does not have su fficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. it is recommended to im plement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and ground pins. for this ic with several power supplies and a part consists of the cmos block, it is possible that rush current may flow instantaneously due to the internal powering sequence and delays, and to the unstable internal logic, respectively. therefore, give special consideration to power coupling capacitance, width of power and ground wirings, and routing of wiring. -2 [mv/c] a - b[mv] 50 a vin gnd v vin gnd fig.20 tjmax measurem ent circuit diagram v
bd6757kn, bd6889gu technical note 14/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. 4) ground pins and lines ensure a minimum gnd pin potential in all operating conditions. make sure that no pins are at a voltage below the gnd at any time, regardless of whether it is a transient signal or not. when using both small signal gnd and large current mgnd pa tterns, it is recommended to isolate the two ground patterns, placing a single ground point at the application's reference point so t hat the pattern wiring resistance and voltage variations caused by large currents do not cause variations in the small signal ground voltage. be careful not to change the gnd wiring pattern of any external components, either. the power supply and ground lines must be as short and thick as possible to reduce line impedance. 5) thermal design use a thermal design that allows for a sufficient margin in light of the power dissipation (pd) in actual operating conditions. 6) pin short and wrong direction assembly of the device use caution when positioning the ic fo r mounting on printed circuit boards. t he ic may be damaged if there is any connection error or if positive and ground power supply termi nals are reversed. the ic may also be damaged if pins are shorted together or are shorted to other circuit?s power lines. 7) actions in strong magnetic field use caution when using the ic in the pres ence of a strong magnetic field as doi ng so may cause the ic to malfunction. 8) aso when using the ic, set the output transistor for the motor so that it does not exceed absolute maximum ratings or aso. 9) thermal shutdown circuit if the junction temperature (tjmax) reaches 175c, the tsd circuit will operate, and th e coil output circuit of the motor will open. there is a temperature hysteresis of approximately 20c (bd6757kn typ. ) and 25c (bd6889gu typ.). the tsd circuit is designed only to shut off the ic in order to prev ent runaway thermal operation. it is not designed to protect the ic or guarantee its operation. the performance of the ic?s characteristics is not guar anteed and it is recommended that the device is replaced after the tsd is activated. 10) testing on application board when testing the ic on an application board, connecting a capa citor to a pin with low impedance subjects the ic to stress. always discharge capacitors after each process or step. always turn the ic's power supply off before connecting it to, or removing it from a jig or fixture, during the inspection process. ground the ic during assembly steps as an antistatic measure. use similar precaution when transporting and storing the ic. 11) application example the application circuit is recommended for use. make sure to confirm the adequacy of the characteristics. when using the circuit with changes to the external circuit constants, make sure to leave an adequate margin for external components including static and transitional characteri stics as well as dispersion of the ic. 12) regarding input pin of the ic this monolithic ic contains p + isolation and p substrate layers between ad jacent elements to keep them isolated. p-n junctions are formed at the intersection of these p layers with the n layers of ot her elements, creating a parasitic diode or transistor. for example, the relation be tween each potential is as follows: when gnd > pin a, the p-n junction operates as a parasitic diode. when gnd > pin b, the p-n junction operates as a parasitic diode and transistor. parasitic elements can occur inevitably in the structure of the ic. the operation of parasitic elements can result in mutual interference among circuits, operational faults, or physical damage. accordingly, methods by which parasitic elements operate, such as applying a voltage that is lower than the gnd (p substrate) voltage to an input pin, should not be used. fig.21 example of simple ic architecture parasitic element other adjacent elements parasitic element resistor transistor (npn) n n n p + p + p p substrate gnd pin a n n p + p + p p substrate gnd parasitic element pin b c b e n gnd pin a parasitic element pin b e b c gnd
bd6757kn, bd6889gu technical note 15/15 www.rohm.com 2009.06 - rev.a ? 2009 rohm co., ltd. all rights reserved. ordering part number b d 6 7 5 7 k n - e 2 part no. part no. 6757 : wide power supply voltage range 6889 : subminiature package package kn : uqfn52 gu : vbga063t050 packaging and forming specification e2: embossed tape and reel (unit : mm) uqfn52 notice : do not use the dotted line area for soldering 0.05 m 0.05 52 0.6 1 27 - 0.3 +0.1 40 14 (1.2) 3-( 0. 45 ) 0.4 0.02 +0.03 - 0.02 0.22 0.05 26 39 13 ( 0. 2 ) 0.95max (0.55) 7.2 0.1 7.2 0.1 7.0 0.1 0.2 0.05 7.0 0.1 ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape (with dry pack) tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 2500pcs e2 () direction of feed reel 1pin (unit : mm) vbga063t050 f 8 3 c 1.2max d g 0.5 a e 0.5 762 h 51 0.23 4 b 5.0 0.1 5.0 0.1 0.75 0.1 0.75 0.1 p=0.5 7 p=0.5 7 s m abs 0.05 63- 0.3 0.05 0.08 s a b 1pin mark ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape (with dry pack) tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 2500pcs e2 () direction of feed reel 1pin
r0039 a www.rohm.com ? 2009 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specied in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specied herein is intended only to show the typical functions of and examples of application circuits for the products. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specied herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.

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