A3957SA View Datasheet(PDF) - Allegro MicroSystems
Part Name
Description
MFG CO.
'A3957SA' PDF : 16 Pages View PDF
3957
FULL-BRIDGE PWM
MICROSTEPPING
MOTOR DRIVER
Table 1 — PHASE Truth Table
PHASE
H
L
OUTA
H
L
OUTB
L
H
Table 2 — PFD Truth Table
VPFD
≥3.5 V
1.2 V to 2.9 V
≤0.8 V
Description
Slow Current-Decay Mode
Mixed Current-Decay Mode
Fast Current-Decay Mode
Table 3 — DAC Truth Table
DAC Data
D3 D2 D1 D0
HHHH
HHHL
HHL H
HHL L
HL HH
HLHL
HL LH
HL L L
L HHH
L HHL
LHLH
LHL L
L L HH
L LHL
LLLX
Current
Ratio, %
100
VREF/VS
3.00
95.7
3.13
91.3
3.29
87.0
3.45
82.6
3.64
78.3
3.83
73.9
4.07
69.6
4.31
60.9
4.93
52.2
5.74
43.5
6.90
34.8
8.62
26.1
11.49
17.4
17.24
All Outputs Disabled
where VS = ITRIP • RS. See Applications section.
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