A3977SED Allegro Microsystems Inc, A3977SED Datasheet - Page 16

• Manufacturer Part Number: A3977SED
• Description: IC MOTOR DRIVER PWM DUAL 44PLCC
• Manufacturer: Allegro Microsystems Inc

Specifications of A3977SED

• Applications: Stepper Motor Driver
• Number Of Outputs: 1
• Current - Output: ±2.5A
• Voltage - Load: 8 V ~ 35 V
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 44-LCC (J-Lead)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

A3977
Terminal
Name
GND
SENSE
HOME
DIR
OUT
NC
PFD
RC
GND
AGND
REF
RC
LOGIC SUPPLY
NC
OUT
MS
MS
SENSE
GND
LOAD SUPPLY
SR
RESET
OUT
NC
STEP
V
PGND
GND
V
CP
CP
NC
OUT
ENABLE
SLEEP
LOAD SUPPLY
* AGND and PGND on the TSSOP package must be connected together externally.
REG
CP
1
2
1
2
2
1
1A
2A
2B
1B
1
2
2
1
Terminal Description
Analog and power ground
Sense resistor for bridge 1
Logic output
Logic Input
DMOS H bridge 1 output A
No (internal) connection
Mixed decay setting
Analog Input for fi xed offtime – bridge 1
Analog and power ground
Analog ground
Gm reference input
Analog input for fi xed offtime – bridge 2
V
No (internal) connection
DMOS H bridge 2 output A
Logic input
Logic input
Sense resistor for bridge 2
Analog and power ground
V
Logic input
Logic input
DMOS H bridge 2 output B
No (internal) connection
Logic input
Regulator decoupling
Power ground
Analog and power ground
Reservoir capacitor
Charge pump capacitor
Charge pump capacitor
No (internal) connection
DMOS H bridge 1 output B
Logic input
Logic input
V
DD
BB2
BB1
, the logic supply voltage
, the load supply for bridge 2
, the load supply for bridge 1
Microstepping DMOS Driver with Translator
Terminal List
(TSSOP)
21*
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
LP
10
12
13
14
15
16
17
18
19
20
22
23
24
25
26
27
28
7*
11
–
1
2
3
4
–
5
6
–
8
9
–
–
–
–
–
22, 23, 24
33, 34, 35
11, 12, 13
(PLCC)
44, 1, 2
29, 30
7, 8
ED
10
14
15
16
17
18
19
20
21
25
26
27
28
31
32
36
37
38
39
40
41
42
43
3
4
5
6
9
–
–
16