A3957SA Просмотр технического описания (PDF) - Allegro MicroSystems
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A3957SA Datasheet PDF : 16 Pages
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3957
FULL-BRIDGE PWM
MICROSTEPPING
MOTOR DRIVER
Terminal Functions
A3957SA
Pin
–
5
6
A3957SLB
Lead
1
2
3
Terminal
Name
NC
PFD
REF
–
4
NC
7
5
RC
8*
6-7
GROUND
9
8
D3
10
9
LOGIC SUPPLY
11
10
PHASE
12
11
D2
–
12
NC
13
13
D1
–
14
NC
14
15
OUTA
–
16
NC
15
17
SENSE
16
–
NC
1*
18-19
GROUND
2
20
D0
–
21
NC
3
22
OUTB
4
23
LOAD SUPPLY
–
24
NC
Description
No internal connection.
(Percent Fast Decay) The analog input used to set the current-decay mode.
(VREF) The voltage at this input (along with the value of RS and the states of DAC
inputs D0, D1, and D2) set the peak output current.
No internal connection.
The parallel combination of external resistor RT and capacitor CT set the off time
for the PWM current regulator. CT also sets the blanking time.
Return for the logic supply (VCC) and load supply (VBB); the reference for all
voltage measurements.
(DATA3) One of four (MSB) control bits for the internal digital-to-analog converter.
(VCC) Supply voltage for the logic circuitry. Typically = 5 V.
The PHASE input determines the direction of current in the load.
(DATA2) One of four control bits for the internal digital-to-analog converter.
No internal connection.
(DATA1) One of four control bits for the internal digital-to-analog converter.
No internal connection.
One of two output load connections.
No internal connection.
Connection to the sink-transistor emitters. Sense resistor RS is connected
between this point and ground.
No internal connection.
Return for the logic supply (VCC) and load supply (VBB); the reference for all
voltage measurements.
(DATA0) One of four (LSB) control bits for the internal digital-to-analog converter.
No internal connection.
One of two output load connections.
(VBB) Supply voltage for the load.
No internal connection.
* For the ‘A’ package, pins 1 and 8 must be externally connected together.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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