LV8731V
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8
PIN FUNCTIONS
Pin No.
Pin Name Pin Function Equivalent Circuit
6
7
10
13
14
15
16
17
18
19
ATT2
ATT1
EMM
RST/BLK
STEP/DC22
FR/DC21
MD2/DC12
MD1/DC11
DM
OE
Motor holding current switching pin
Motor holding current switching pin
Output short−circuit protection mode
switching pin
RESET input pin (STM) / Blanking time
switching pin (DCM)
STEP signal input pin (STM) / Channel
2 output control input pin 2 (DCM)
CW / CCW signal input pin (STM) /
Channel 2 output control input pin 1
(DCM)
Excitation mode switching pin 2 (STM)
/ Channel 1 output control input pin 2
(DCM)
Excitation mode switching pin 1 (STM)
/ Channel 1 output control input pin 1
(DCM)
Drive mode (STM/DCM) switching pin
Output enable signal input pin
VREG5
GND
10 k
100 k
20 ST Chip enable pin
VREG5
GND
10 k
80 k
20 k
23, 24
25, 42
28, 29
30, 31
32, 33
34, 35
36, 37
38, 39
43, 44
OUT2B
PGND
VM2
RF2
OUT2A
OUT1B
RF1
VM1
OUT1A
Channel 2 OUTB output pin
Power system ground
Channel 2 motor power supply
connection pin
Channel 2 current−sense resistor con-
nection pin
Channel 2 OUTA output pin
Channel 1 OUTB output pin
Channel 1 current−sense resistor
connection pin
Channel 1 motor power supply pin
Channel 1 OUTA output pin
GND
500
500
10 k
