Si9978
Vishay Siliconix
TRUTH TABLE
H-BRIDGE MODE
DIR/
EN/
QS/
PWM/
CL/
FAULT/
MODE
IN A
EN A
IN B
EN B
BRK
IL A +
IL B +
GT A
GB A
GT B
GB B
FAULT B
FAULT A
Condition
1
1
1
1
0
L
X
H
L
L
1
1
1
1
1
0
1
1
0
1
0
0
L
L
X
X
L
L
L
H
L
1
1
1
1
Normal
Operation
1
0
1
0
0
L
X
L
L
1
1
1
1
X
X
1
0
X
X
X
X
1
X
L
L
X
X
L
L
H
L
L
L
H
L
1
1
1
1
Brake
Disable
1
X
1
X
X
0
X
L
L
L
L
Overcurrent
1
X
X
X
X
X
X
X
L
L
L
L
1
0
Undervoltage
on V DD
TRUTH TABLE
HALF-BRIDGE MODE
DIR/
EN/
QS/
PWM/
CL/
FAULT/
MODE
0
0
0
0
IN A
1
0
X
X
EN A
1
1
0
0
IN B
X
X
1
0
EN B
0
0
1
1
BRK
X
X
X
X
IL A +
L
L
L
L
IL B +
L
L
L
L
GT A
H
L
L
L
GB A
L
H
L
L
GT B
L
L
H
L
GB B
L
L
L
H
FAULT B
1
1
1
1
FAULT A
1
1
1
1
Condition
Normal
Operation
0
0
X
X
1
X
X
X
X
1
X
X
X
X
L
X
L
X
X
L
X
L
1
1
Overcurrent on
A
Overcurrent on
B
0
X
X
X
X
X
X
X
L
L
L
L
0
0
Undervoltage
on V DD
Document Number: 70011
S-40804—Rev. E, 26-Apr-04
www.vishay.com
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