SDIP42

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o

PLCC44

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o

Name

Functions

42

1

S1,2C

Full bridge common source output to separate between power GND

and logic GND.

1,41

2,44

OUT 1C, OUT 2C

Output of the channel C bridge.

2

3

COM 1,2A

High side DMOS channel A for current chopping in the windings

connected pins to OUT 1A, OUT 2A.

3,39

4,42

Power Supply Voltage.

4

5

COM 3,4A

High side DMOS channel A for current chopping in the windings

connected to pins OUT 3A, OUT 4A.

6,37

6,7,39,40

GND

PowerGround and heatsink pins.

7,9,

11,14

8,10

12,14

OUT 1A, OUT 2A

OUT 3A, OUT 4A

Low side DMOS outputs of channel A stepper motor driver.

8

9

S1,2A

Channel A sources of the DMOS OUT 1A, OUT 2A. A sensing resistor

has to be connected from this pin and ground, for current control of

phase 1,2 A.

10,33

11,35

CLAMP A, CLAMP B

These pins have to be connected to an external zener diode to

clamp the output voltage spikes of channel A/B.

12

13

S3,4A

Channel A sources of the DMOS OUT 3A, OUT 4A. A sensing resistor

has to be connected from this pin and ground, for current control of

phase 3,4 A.

14

15

BOOT 1

high side DMOS driver gate.

15

16

BOOT 3

A capacitor between this pin and internal diodes allows the change

pump to transfer energy to the capacitor at the pin BOOT 1.

16,27

17,29

GND

Logic Ground and Heatsink pins.

18

18

BOOT 2

Charge pump oscillator output.

19

19

SID

Serial data input.

20

20

SCK

Serial clock for serial data input.

21

21

STB

Strobe to transfer the 16 bit shift register contents to the latch

registers.

5,17

22,24

NC

Not connected.

22,39

23

Logic Supply Voltage.

23,24

25,26

A0TH / A1TH

Open collector outputs for thermal informations to the

µP.

25

27

OSC/ RESET

An RC network connected to this pin defines the oscillator frequency

for stepper drivers. When OSC/RES is <1V, a reset signal is

internally generated.

26

28

V2

A voltage to this pin defines the output duty cycle of Channel C.

28

30

A capacitor connected to this pin defines the chopping frequency of

channel C.

29

31

This pin is low when the chopping low voltage (V2 low level) is

selected; it is in high impedance when the chopping high voltage (V2

high level) is selected. Only for CHC operation.

30,32,

34,36

32,34

36,38

OUT4B, OUT3B

OUT2B ,OUT1B

Low side DMOS outputs of channel B stepper motor driver.

31

33

S 3, 4B

Same as S 3, 4A, but for channel B.

35

37

S 1, 2B

Same as S 1, 2A, but for channel B.

38

41

COM 3, 4B

Same as COM 3, 4A, but for channel B.

40

43

COM 1, 2B

Same as COM 1, 2A, but for channel B.

PIN DESCRIPTION

L6285

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