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A3992 Datasheet(PDF) 5 Page - Allegro MicroSystems

Part # A3992
Description  DMOS Dual Full-Bridge Microstepping PWM Motor Driver
Download  13 Pages
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A3992 Datasheet(HTML) 5 Page - Allegro MicroSystems

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DMOS Dual Full-Bridge
Microstepping PWM Motor Driver
A3992
5
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
The A3992 is controlled via a 3 wire serial port. The
programmable functions allow maximum flexibility in
configuring the PWM to the motor drive requirements.
The serial data is written as two 19 bit words, 1 bit
to select which word (referred to here as Word 0 and
Word 1) and 18 bits of data. The serial port is defined
in the following tables and text descriptions.
Word 0 Bit Assignments
Word 0 is selected by setting D0 = 0. Assignments are
summarized in the following table, and described in
detail in the remainder of this section.
Word 0 Bit Assignments
Bit
Function
D0
Word Select = 0
D1
Bridge 1, DAC, LSB
D2
Bridge 1, DAC, Bit2
D3
Bridge 1, DAC, Bit3
D4
Bridge 1, DAC, Bit4
D5
Bridge 1, DAC, Bit 5
D6
Bridge 1, DAC, MSB
D7
Bridge 2, DAC, LSB
D8
Bridge 2, DAC, Bit2
D9
Bridge 2, DAC, Bit3
D10
Bridge 2, DAC, Bit4
D11
Bridge 2, DAC, Bit 5
D12
Bridge 2, DAC, MSB
D13
Bridge 1 Phase
D14
Bridge 2 Phase
D15
Bridge 1 Mode
D16
Bridge 2 Mode
D17
Reference Select
D18
Range Select
D1 – D6 Bridge 1, Linear DAC.
6 bit word to set de-
sired current level for bridge 1. Setting all bits to zero
disables Full Bridge 1, all drivers off. (See Current
Regulation in the Functional Description section.)
D7 – 12 Bridge 2 Linear DAC.
6 bit word to set the
desired current level for bridge 2. Setting all bits to
zero disables Full Bridge 2, all drivers off. (See Cur-
rent Regulation in the Functional Description section.)
D13 Bridge 1 Phase.
This bit controls the direction
of current for motor phase 1 as defined below:
D13
OUT1A
OUT1B
0L
H
1H
L
D14 Bridge 2 Phase.
This bit controls the direction
of current for motor phase 2 as defined below:
D14
OUT2A
OUT2B
0L
H
1H
L
D15 Bridge 1 Mode.
This bit determines the decay
for Full Bridge 1 as defined below:
D15
Mode
0
Mixed Decay
1
Slow Decay
D16 Bridge 2 Mode.
This bit determines the decay
for Full Bridge 2 as defined below:
D16
Mode
0
Mixed Decay
1
Slow Decay
D17 Ref Select.
This bit determines the reference
input for the two 6 bit linear DACs. Logic low selects
internal 2 V reference voltage, logic high selects ex-
ternal reference input on the REF pin.
D18 Gm Range Select. D18 determines if the scaling
factor used is 4 or 8:
D18
Divider
Load Current
0÷ 8
ITRIP = VDAC/(RSENSE × 8)
1÷ 4
ITRIP = VDAC/(RSENSE × 4)
Serial Interface Description


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