SDIP42
N
o
PLCC44
N
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
Vp
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
A capacitor between this pin and Vp stores the overvoltage for each
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
BOOT 2
Charge pump oscillator output.
19
SID
Serial data input.
20
SCK
Serial clock for serial data input.
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
Vs
Logic Supply Voltage.
23,24
25,26
A0TH / A1TH
Open collector outputs for thermal informations to the
P.
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
Cosc
A capacitor connected to this pin defines the chopping frequency of
channel C.
29
31
Vlow
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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