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rev.1.0, sep.19.2003, page 1 of 10 M54670P 2-phase stepper motor driver rej03f0045-0100z rev.1.0 sep.19.2003 description the M54670P is a semiconductor ic to drive a bipolar stepper motor directly by controlling the coil current with the constant current method. features ? wide operating voltage range (10 ? 35v) ? wide output current control range (20 ? 800ma) ? bipolar and constant current drive ? built in flywheel ? current level can be changed by steps or continuously. ? built in a thermal shutdown circuit application office automation equipment such as printer, fdd, hdd, and fax function the M54670P can drive a stepper motor by the 2-phase bipolar method and also control the coil current. furthermore, it controls the direction of the coil current with ph input pins (pins 3 and 30). the coil current value can be selected among four levels (0 to max.) by selecting the combination of three internal comparators by logic input (pins 14, 15, 18 and 19). it also can be continuously controlled with vr pins (pins 2 and 31). by selecting an i input pin among pins 14, 15, 18 or 19, the operation timing, 2-phase excitation, 1-2-phase excitation or microstep, can be selected. because two control circuits are built in this ic, a stepper motor can be driven with a single ic by the 2-phase bipolar method.
M54670P rev.1.0, sep.19.2003, page 2 of 10 pin configuration 32 29 30 31 28 27 24 23 22 21 20 19 26 25 18 17 1 4 3 2 5 6 9 10 11 12 13 14 7 8 15 16 outline 32p4b ct v r (a) ph(a) v mm 1(a) o1(a) gnd e(a) o2(a) v mm 2(a) i0(a) i1(a) c(a) v cc v r (b) ph(b) v mm 1(b) o1(b) gnd e(b) o2(b) v mm 2(b) i0(b) i1(b) c(b) trian g ular wave comparator reference input ( a ) output current direction switchin g (a) output power supply(a) output ( a ) current sensor ( a ) output ( a ) output power suppl y( a ) output current value setting(a) output current value setting(a) comparator input ( a ) circuit power supply comparator reference input ( b ) output current direction switchin g( b ) output power suppl y( b ) output ( b ) current sensor(b) output(b) output power supply(b) output current value settin g (b) output current value settin g (b) comparator input(b) M54670P
M54670P rev.1.0, sep.19.2003, page 3 of 10 block diagram 2 32 3 4 5 12 13 29 28 21 20 30 31 17 c(b) 22 e(b) 11 e(a) 1 ct 16 c(a) 14 15 10 00 10 01 11 11 01 10 00 6 gnd comparator input(a) triangular wave current sensor(a) current sensor(b) comparator input(b) power supply sensor triangular wave gnd 23 output current value i0(a) i1(a) 19 18 setting(b) i0(b) control circuit control circuit tsd power supply sensor v r (a) comparator reference input(a) v cc circuit power supply p h (a) output current direction switching(a) v mm 1(a) output power supply(a) o2(a) output(a) v mm 2(a) output power supply(a) v mm 1(b) output power supply(b) o1(b) output(b) o2(b) output(b) v mm 2(b) output power supply(b) v r (b) comparator input(b) p h (b) output current direction switching(b) setting(a) output current value setting(a) output current value setting(b) i1(b) output current value o1(a) output(a) 27 absolute maximum ratings (ta = 25 c, unless otherwise noted.) parameter symbol ratings unit conditions supply voltage vcc 0.3 to 7 v output supply voltage vmm 0.3 to 40 v logic input voltage vl 0.3 to 6 v comparator input voltage vc vcc v reference input voltage vr 7 v output current io 1.0 a allowable power dissipation pd 1.92 w mounted on a board operating temperature topr 20 to 75 c storage temperature tstg 55 to 125 c
M54670P rev.1.0, sep.19.2003, page 4 of 10 recommended operating condition (ta = 25 c, vcc = 5 .0v, unless otherwise noted.) limits parameter symbol min. typ. max. unit supply voltage vcc 4.75 5.00 5.25 v output supply voltage vmm 10 35 v reference input voltage ir 0 ? 800 v output current io 20 800 ma logic input rise time tplh 2.0 s logic input fall time tphl 2.0 s thermal shutdown temperature* ton 175 ?c note * : refer to "precautions for use." electrical characteristics (ta = 25 c, vcc = 5.0v, vmm = 10v, unless otherwise noted.) limits parameter symbol min. typ. max. unit test conditions logic input voltage h vih 2.0 vcc v vcc=5v l vil 0 0.8 comparator threshold vch 430 460 480 mv vr=5v, i0=i1=0 vcm 265 285 305 vr=5v, i0=1,i1=0 vcl 90 110 130 vr=5v, i0=0, i1=1 comparator input current ico ? 20 ? 2 20 a i0=i1=1(ta=25 ?c) output cutoff current ioff 0 100 a saturation voltage vsat 3.0 4.5 v voltage at sensing resistor is not included. io=500ma pwm oscillator frequency fc 16.5 33 66 khz vmm=10v, cf = 3900pf turnoff delay td 1.0 2.0 s ta=25 ?c, dvk/dt 50mv/ s supply current icc 8.0 25 ma vcc=5v logic input current h iih 180 400 a vi=2.4v l iil 20 50 a vi=0.4v application description (1) phase input phase input decides the output mode. phase o1 o2 h l h l h l
M54670P rev.1.0, sep.19.2003, page 5 of 10 (2) i0, i1 i0 and i1 fixed based on the comparative voltage vr decide the output current level. i0 i1 current level h h 0 l h low h l typ l l high (3) vr (comparative voltage) the current level can be continuously changed by changing the voltage at vr continuously. (4) current sensor when the voltage fall at the current sensing resistor and the selected current level become of the same level, the output state is cut off for a certain time by inverting the comparator. during this cutoff time, the current volume decreases slightly due to the l component of the motor and falls short of the comparative level. during the time fixed based on the pwm frequency, the output stage goes in on state and then in off state and this on/off operation is repeated. (5) pwm oscillator a capacitor c f is externally connected to ct pin in order to fix the pwm oscillator frequency. the frequency fc is calculated as follows. f c = 7.77 x 10 3 xc f 1 (6) analog control the output current level can be continuously changed by changing the voltage at vr or the feedback voltage to the comparator. (7) thermal shutdown function this ic has a function to protect itself against thermal damage which is caused when the chip temperature rises abnormally. regarding this function, refer to ?precautions for use.?
M54670P rev.1.0, sep.19.2003, page 6 of 10 timing chart 2-phase excitation phase 1 phase 2 i0, 1(a) = 0 i0, 1(b) = 0 1-2-phase excitation phase 1 phase 2 i0, 1(a) i0, 1(b) microstep phase 1 phase 2 i0(a) i1(a) i0(b) i1(b)
M54670P rev.1.0, sep.19.2003, page 7 of 10 typical characteristics (absolute maximum ratings) 1.0 0.6 output current io (a) 0 10 50 output v mm (v) 20 30 40 0.2 0.4 0.8 35 0 a : b : c : recommended schottky diodes should be externally connected between output pin and power supply pin. schottky diodes should be externally connected between output pin and power supply pin and between output pin and gnd pin. safety operating range 2.0 allowable power dissipation (w) 0 80 ambient (c) 1.0 3.0 0 a : free air ( c-a = 50 c/w) b : with 10cm 2 aluminum heat ( c-a = 25 c/w) c : with 100cm 2 aluminum heat ( c-a = 10 c/w) thermal derating 10 20 30 40 50 60 70 4.0 a b c j-c = 20 c/w t j(max) = 150 c b ac
M54670P rev.1.0, sep.19.2003, page 8 of 10 application example (stepping motor driver) 1c t 2v r (a) 3p h (a) 4v mm 1(a) 5 o1(a) 6 7 8 9 gnd 10 11 12 o2(a) 13 v mm 2(a) 14 i0(a) 15 i1(a) 16 c(a) 32v cc 31v r (b) 30p h (b) 29 v mm 1(b) 28 o1(b) 27 26 25 gnd 24 23 22 21 o2(b) 20 v mm 2(b) 19 i0(b) 18 i1(b) 17 c(b) c c r c r s r c phase a phase b v mm v cc v r in(b) 40 f/50v c c in(a) e(a) e(b) r s c f M54670P 0.01 f c f = 3900pf r s = 0.51 ? r c = 1k ? c c = 820pf stepper motor (3.7mh / 6 ? / phase)
M54670P rev.1.0, sep.19.2003, page 9 of 10 precautions for use (1) when the whole output current changes by a large margin (for example, when thermal shutdown operation causes intermittent flow of output current), the supply voltage may undergo a change. therefore, selection and wiring of power supply should be conducted cautiously to avoid such a situation that the supply voltage exceeds the absolute maximum ratings. (2) when the supply voltage changes by a large margin, the operation of this ic may become unstable. in this case, the change of supply voltage can be controlled by connecting a capacitor between vcc pin and gnd pin. (3) thermal shutdown function the state of thermal shutdown operation may differ according to the way of wiring within a board. therefore, sufficient board evaluation should be conducted before use. when the board is changed, operation on the replacing board should be evaluated. the circuit board on which this ic is mounted is designed to realize low impedance between power supply and output pin. therefore, it is desirable to take a safe measure such as fixing a fuse to avoid such a situation that the board is damaged by a fire when output pin is internally short-circuited by excessively applied surge voltage by accident.
M54670P rev.1.0, sep.19.2003, page 10 of 10 package dimensions sdip32-p-400-1.78 weight(g) ? 2.2 jedec code eiaj package code lead material alloy 42/cu alloy 32p4b plastic 32pin 400mil sdip symbol min nom max a a 2 b b 1 b 2 c e d l dimension in millimeters a 1 0.51 ?? ? 3.8 ? 0.35 0.45 0.55 0.9 1.0 1.3 0.63 0.73 1.03 0.22 0.27 0.34 27.8 28.0 28.2 8.75 8.9 9.05 ? 1.778 ? ? 10.16 ? 3.0 ?? 0? 15? 5. 08 e e 1 32 17 16 1 e c e 1 a 2 a 1 b 2 b b 1 e la sea ting plane d mmp
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