fdd products KA2820D2 1 mic-98d002 august 1998 stepping motor driver the KA2820D2 is a monolithic integrated circuit, and suitable as a the two-phase stepping motor driver of a 5.25? fdd system. features ? built-in power save function ? low saturation voltage ? low power dissipation ? input level: ttl, lsttl, 5v cmos compatible ? standard mpu direct interface ? built-in tsd circuit block diagram 20-sop-375 ordering information device package operating temperature KA2820D2 20-sop-375 - 20 ~ +75 c ttl interface tsd ttl interface v s2a dira v cc gnd v s2b dirb ps v s1a aout aout gnd v s1b bout bout gnd rev. b 1999 fairchild semiconductor corporation
KA2820D2 fdd products 2 mic-98d002 august 1998 pin configuration pin descripion pin no. symbol description channel 1 nc no connection - 2 v s2a a-channel holding supply voltage a 3 v cc logic part supply voltage a, b 4 dira a-channel direction input a 5 gnd signal ground a, b 6 gnd signal ground a, b 7 dirb b-channel direction input b 8 ps power save input a, b 9 v s2b b-channel holding supply voltage b 10 nc no connection - 11 nc no connection - 12 v s1b b-channel seeking supply voltage b 13 bout b-channel output b 14 bout b-channel inverting output b 15 gnd power ground a, b 16 gnd power ground a, b 17 aout a-channel inverting output a 18 aout a-channel output a 19 v s1a a-channel seeking supply voltage a 20 nc no connection - 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 KA2820D2 nc v s2a v cc dira gnd gnd dirb ps v s2b nc nc v s1a aout aout gnd gnd bout bout v s1b nc
fdd products KA2820D2 3 mic-98d002 august 1998 absolute maximum rating (t a =25 c) recommended operating conditions characteristics symbol value unit logic part supply voltage v cc 7.0 v seeking supply voltage v s1 15.0 v holding supply voltage v s2 7.0 v input voltage v in v cc v seeking output current (continuouts) i os 330 ma seeking output current (peak) i ospeak 500 ma holding output current i oh 200 ma package power dissipation p d 1.0 w operating temperature range t opr - 20 ~ 75 c storage temperature t stg - 40 ~ 125 c characteristics symbol min. typ. max. unit logic part supply voltage v cc 4.5 5.0 5.5 v seeking supply voltage v s1 10.2 12.0 13.8 v holding supply voltage v s2 4.5 5.0 5.5 v
KA2820D2 fdd products 4 mic-98d002 august 1998 electrical characteristics (ta=25 c, v cc =5v, v s1 =12v, v s2 =5v, unless specified otherwise) characteristic symbol test conditions min. typ. max. unit digital input ?l? voltage v il - - - 0.8 v digital input ?h? voltage v ih - 2.0 - - v digital input ?l? current i il v in =0.8v - 0 10 m a digital input ?h? current i ih1 v in =2.0v - 1 10 m a i ih2 v in =5v - 0.3 1.0 ma iv ccl ps=0.8v - 25 33 ma iv s1l ps=0.8v - 6 10 ma supply current iv s2l ps=0.8v - - 0.1 ma iv cch ps=2.0v - 25 33 ma iv s1h ps=2.0v - 1 2 ma v s2h ps=2.0v - 2.5 4 ma output sustain voltage v sus i o =130ma, ps=0.8v 18 - - v vs1 output saturation voltage v sat1 i o =130ma, ps=2.0v - 1.5 2.0 v vs2 output saturation voltage v sat2 i o =130ma - 1.5 2.0 v output clamp voltage v fu i o =330ma (upper) - 3.0 5.0 v v fl i o =330ma (lower) - 1.5 2.0 v output delay time t plh input pulse (2khz) - 1.0 5.0 m s t phl input pulse (2khz) - 1.0 5.0 m s tsd operating temperature tsd - 125 150 - c tsd hysterisis d tsd - - 25 - c
fdd products KA2820D2 5 mic-98d002 august 1998 application information 1. motor control logic mode selection-truth table note: dirx: dira or dirb (direction input) xout: aout or bout (non-inverting output) xout: aout or bout (inverting output) x: indicate each channel (a and b) 2. holding and seeking mode in rotating high speed (seeking mode), stepping motor is operated by high voltage (v s1 : seeking power supply voltage ?12?). in holding mode, stepping motor is operated by low voltage (v s2 : holding power supply voltage ?5?). when the ps input signal is high, it will be minimized power consumptio in this device. 3. maximum drive current capacity as follows ? peak seeking output current: 0.5a ? continued seeking output current: 0.33a ? holding output current: 0.2a input output operating mode ps dirx xout xout l l l h+ seeking mode h+: operating by v s1 (v s1 =12v) l h h+ l h l l h - open mode h - : operating by v s2 (v s2 =5v) h h h - l
KA2820D2 fdd products 6 mic-98d002 august 1998 timing chart 100 m s seeking mode holding mode 100 m s min ps min dira dirb aout aout bout bout h l l h l h v s1 v s2 0 v s1 v s2 0 v s1 v s2 0 v s1 v s2 0
fdd products KA2820D2 7 mic-98d002 august 1998 application circuit 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 nc v s2a v cc dira gnd gnd dirb ps v s2b nc nc v s1a aout aout gnd gnd bout bout v s1b nc KA2820D2 load a (5v) a-ch in b-ch in mode selection load b (12v)
KA2820D2 fdd products 8 mic-98d002 august 1998 package dimension
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