A4979 Datasheet, PDF (2/44 Pages) Allegro MicroSystems – The A4979 is a flexible microstepping motor driver with built-in translator for easy operation.

A4979
Microstepping Programmable Stepper Motor Driver
With Stall Detect and Short Circuit Protection
Selection Guide
Part Number
Packing*
A4979GLPTR-T
4000 pieces per reel
*Contact Allegro^® for additional packing information.
4.4 mm × 9.7 mm, 1.2 mm nominal height TSSOP
with exposed thermal pad
Absolute Maximum Ratings With respect to GND
Characteristic
Symbol
Notes
Load Supply Voltage
Logic Supply Voltage
Pin CP1
V_BBx
V_DD
Applies to V_BBA and V_BBB
Pins CP2, VCP
Pins STEP, DIR, ENABLE, DIAG
Pin VREG
Pin RESETn
Pin OSC
Can be pulled to V_BB with 38 kΩ
Pins MS0, MS1
Pins SDI, SDO, SCK, STRn
Pin REF
Pins OAP, OAM, OBP, OBM
Pins SENSA, SENSB
Ambient Operating Temperature
Range
T_A
Range G; limited by power dissipation
Maximum Continuous Junction
Temperature
T_J(max)
Transient Junction Temperature
Overtemperature event not exceeding 10 s,
T_tJ
lifetime duration not exceeding 10 hours,
guaranteed by design and characterization
Storage Temperature Range
T_stg
Thermal Characteristics may require derating at maximum conditions
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance
(Junction to Ambient)
4-layer PCB based on JEDEC standard
R_θJA
2-layer PCB with 3.8 in.² of copper area each side
Package Thermal Resistance
(Junction to Pad)
R_θJP
*Additional thermal information available on the Allegro website.
Rating
–0.3 to 50
–0.3 to 6
–0.3 to V_BB
–0.3 to V_BB+8
–0.3 to 6
–0.3 to 8.5
–0.3 to 6
–0.3 to 6
–0.3 to 6
–0.3 to 6
–0.3 to 6
–0.3 to V_BB
–0.3 to 1
–40 to 105
150
175
–55 to 150
Value
28
32
2
Unit
V
V
V
V
V
V
V
V
V
V
V
V
V
°C
°C
°C
°C
Unit
ºC/W
ºC/W
ºC/W
Functional Block Diagram
Pin-out Diagram
Functional Description
Pin Functions
Driving a Stepper Motor
Diagnostics
Serial Interface Description
Phase Table Load Register
Diagnostic Registers
Table of Contents
3
Application Information
22
4
Motor Movement Control
22
9
Using the Phase Table Load Capability
27
9
Power Dissipation
31
10
12
16
Layout
Package Drawing
33
34
17
Appendix A. Driving a Stepper Motor
A-1
18
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com