3974 データシートの表示（PDF） - Allegro MicroSystems
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3974 Datasheet PDF : 12 Pages
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3974
DMOS DUAL FULL-BRIDGE
PWM MOTOR DRIVER
Terminal Name
GND
SENSE1
NC
OUT1A
NC
STROBE
CLOCK
DATA
GND
REF1
REF2
LOGIC SUPPLY
NC
OUT2A
NC
SENSE2
GND
LOAD SUPPLY2
ENABLE2
NC
OUT2B
NC
VREG
SLEEP
OSC
GND
CP
CP1 & CP2
NC
OUT1B
NC
ENABLE1
LOAD SUPPLY1
GND
Terminal List
Terminal Description
Terminal Number
Power and logic ground terminals
1, 2
Sense resistor terminal for bridge 1
3
No (internal) connection
4, 5
DMOS H-bridge 1 – output A
6
No (internal) connection
7
Logic input for serial Interface
8
Logic input for serial Interface
9
Logic input for serial Interface
10
Power and logic ground terminals
11, 12, 13
Gm reference input voltage – bridge 1
14
Gm reference input voltage – bridge 2
15
VDD, the low voltage (typically 5 V) supply
16
No (internal) connection
17
DMOS H-bridge 2 – output A
18
No (internal) connection
19, 20
Sense resistor pin for bridge 2
21
Power and logic ground terminals
22, 23, 24
VBB2, the high current, 20 V to 50 V,
supply for bridge 2
25
Logic input for bridge 2 – enable control
26
No (internal) connection
27
DMOS H-bridge 2 – output B
28
No (internal) connection
29
Regulator decoupling capacitor (typ. 0.22 µF) 30
Logic input for SLEEP mode
31
Logic-level oscillator (square wave) input
32
Power and logic ground terminals
33, 34, 35
Reservoir capacitor (typically 0.22 µF)
36
The charge pump capacitor (typically 0.22 µF) 37 & 38
No (internal) connection
39
DMOS H-bridge 1 – output B
40
No (internal) connection
41
Logic input for bridge 1 – enable control
42
VBB1, the high current, 20 V to 50 V,
supply for bridge 1
43
Power and logic ground terminals
44
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