A3985 Allegro MicroSystems, Inc., A3985 Datasheet - Page 3

• Manufacturer Part Number: A3985
• Description: Digitally Programmable Dual Full-Bridge MOSFET Driver
• Manufacturer: Allegro MicroSystems, Inc.

A3985
+5 V
ENABLE
SDO
OSC
REF
STR
SCK
SDI
WC
VDD
Programmable Divider
Serial Port
Bandgap
Oscillator
V
REF
V
REF
Programmable
Programmable
Control Logic
Control Logic
Mixed Decay
Mixed Decay
6-bit
DAC
6-bit
DAC
PWM Timer
PWM Timer
Blanking
Blanking
Phase 1
Phase 2
VBB
Regulator
GND
Protection
UVLO
TSD
Functional Block Diagram
Phase 1
Phase 2
Dual Full-Bridge MOSFET Driver
High-Side
Drive
Low-Side
Drive
Low-Side
Drive
High-Side
Drive
High-Side
Drive
Low-Side
Drive
Low-Side
Drive
High-Side
Drive
Phase 1A
Phase 1B
Phase 2A
Phase 2B
V
V
REG
REG
VREG
C1A
GH1A
S1A
GL1A
LSS1
SENSE1
GL1B
S1B
GH1B
C1B
C2A
GH2A
S2A
GL2A
LSS2
SENSE2
GL2B
S2B
GH2B
C2B
Digitally Programmable
CBOOT1A
CBOOT1B
CBOOT2A
CBOOT2B
CREG
RGH1A
RGL1A
RGH2A
RGL2A
V
V
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
MOTOR
MOTOR
RSENSE1
RSENSE2
Bridge1
Bridge2
RGH1B
RGL1B
RGH2B
RGL2B
P
P
P
3