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3974 Datasheet(PDF) 6 Page - Allegro MicroSystems

Part No. 3974
Description  DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

3974 Datasheet(HTML) 6 Page - Allegro MicroSystems

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3974
DMOS DUAL FULL-BRIDGE
PWM MOTOR DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
FUNCTIONAL DESCRIPTION (continued)
continued next page ...
D14 Enable Logic. This bit, in conjuction with ENABLE,
determines if the output drivers are in the chopped or on state.
ENABLE1
D14
Mode
0
0
Chopped
10
On
01
On
1
1
Chopped
D15 Phase Logic. This bit determines if the device is
operating in the forward or reverse state.
D15
State
OUT
A
OUT
B
0
Reverse
L
H
1
Forward
H
L
D16 G
m Range Select. This bit determines if VREF is divided
by 5 or 10.
D16
Divider
0
÷10
1
÷5
D17 Bridge 2 Mode. This bit determines slow or mixed
decay for internal current-control operation.
D17
Decay Mode
0
Mixed
1
Slow
D19 Test Mode. This bit is reserved for testing and should
never be changed by the user. Default (low) operates the
device in normal mode.
Word 1 Bit Assignments
Select Word 1 (D18 = 1)
Bit
Function
D0
Bridge 2 blank time LSB
D1
Bridge 2 blank time MSB
D2
Bridge 2 off-time LSB
D3
Bridge 2 off-time bit 1
D4
Bridge 2 off-time bit 2
D5
Bridge 2 off-time bit 3
D6
Bridge 2 off-time MSB
D7
Bridge 2 fast-decay time bit LSB
D8
Bridge 2 fast-decay time bit 1
D9
Bridge 2 fast-decay time bit 2
D10
Bridge 2 fast-decay time bit MSB
D11
Bridge 2 sync. rect. control
D12
Bridge 2 sync. rect. control
D13
Bridge 2 external PWM mode
D14
Bridge 2 enable
D15
Bridge 2 phase
D16
Bridge 2 reference range select
D17
Bridge 2 internal PWM mode
D18
Word select = 1
D19
Idle mode
D0 - D17. Identical definitions as Word 0, with Word 1
selected. Data is written to Full Bridge 2.
D19 Idle Mode. The device can be placed in a low-power
“idle” mode by writing a “0” to D19. The outputs will be
disabled, the charge pump will be turned off, and the device
will draw a lower load supply currrent. The undervoltage
monitor circuit will remain active. D19 should be programmed
high for 1 ms before attempting to enable any output driver.


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