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A4979 Datasheet Preview

A4979 Datasheet

Microstepping Programmable Stepper Motor Driver

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A4979
Microstepping Programmable Stepper Motor Driver
with Stall Detect and Short Circuit Protection
FEATURES AND BENEFITS
• Typical application up to 1.5 A, 50 V
• Stall detect features
• Low RDS(on) outputs, 0.5 Ω source and sink, typical
• Automatic current decay mode detection/selection
• Mixed, Fast, and Slow current decay modes
• Synchronous rectification for low power dissipation
• Internal UVLO and Thermal Shutdown circuitry
• Crossover-current protection
• Short circuit and open load diagnostics
• Hot and cold thermal warning
• SPI-compatible or simple Step and Direction motion control
• Highly configurable via SPI-compatible serial interface
APPLICATIONS
• Industrial stepper motor drives
• Printers
• Textile machines
PACKAGE: 28-pin TSSOP with exposed
thermal pad (suffix LP)
Not to scale
DESCRIPTION
The A4979 is a flexible microstepping motor driver with
built-in translator for easy operation. It is a single-chip solution,
designed to operate bipolar stepper motors in full-, half-,
quarter- and sixteenth-step modes, at up to 50 V and 1.5 A. The
A4979 can be controlled by simple Step and Direction inputs,
or through the SPI-compatible serial interface that also can be
used to program many of the integrated features and to read
diagnostic information.
The current regulator can be programmed to operate in fixed
off-time or fixed frequency PWM, with several decay modes
to reduce audible motor noise and increase step accuracy.
In addition, the phase current tables can be programmed via
the serial interface to create unique microstep current
profiles to further improve motor performance for
specific applications.
The current in each phase of the motor is controlled through a
DMOS full bridge, using synchronous rectification to improve
power dissipation. Internal circuits and timers prevent cross-
conduction and shoot-through, when switching between high-
side and low-side drives.
The outputs are protected from short circuits, and features
for low load current and stalled rotor detection are included.
Chip-level protection includes hot and cold thermal warnings,
overtemperature shutdown, and undervoltage lockout.
The A4979 is supplied in a 28-pin TSSOP power package with
an exposed thermal pad (package type LP). This package is
lead (Pb) free with 100% matte-tin leadframe plating.
Logic
Supply
Micro-
controller
or
ECU
CP1 CP2 VCP VBB
VDD
STEP
DIR
MS0
MS1
ENABLE
RESETn
OAP
OAM
DIAG A4979
REF
SDI
SDO
SCK
STRn
VREG
OSC
OBP
OBM
SENSA
SENSB
AGND PGND
Typical Applications
VBB
Logic
Supply
Stepper
Motor
Micro-
controller
or
ECU
CP1 CP2 VCPVBB
VDD
STEP
DIR
MS0
MS1
ENABLE
RESETn
OAP
OAM
DIAG A4979
REF
SDI
SDO
SCK
STRn
VREG
OSC
OBP
OBM
SENSA
SENSB
AGND PGND
A4979-DS, Rev. 3
MCO-0000815
Serial Interface Control
Parallel Control
VBB
Stepper
Motor
April 2, 2020




Allegro

A4979 Datasheet Preview

A4979 Datasheet

Microstepping Programmable Stepper Motor Driver

No Preview Available !

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 Allegrofor 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
VBBx
VDD
Applies to VBBA and VBBB
Pins CP2, VCP
Pins STEP, DIR, ENABLE, DIAG
Pin VREG
Pin RESETn
Pin OSC
Can be pulled to VBB 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
TA
Range G; limited by power dissipation
Maximum Continuous Junction
Temperature
TJ(max)
Transient Junction Temperature
Overtemperature event not exceeding 10 s,
TtJ
lifetime duration not exceeding 10 hours,
guaranteed by design and characterization
Storage Temperature Range
Tstg
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
RθJA
2-layer PCB with 3.8 in.2 of copper area each side
Package Thermal Resistance
(Junction to Pad)
RθJP
*Additional thermal information available on the Allegro website.
Rating
–0.3 to 50
–0.3 to 6
–0.3 to VBB
–0.3 to VBB+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 VBB
–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
10
12
16
17
Power Dissipation
31
Layout
33
Package Drawing
34
Appendix A. Driving a Stepper Motor
A-1
18
2
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com



Part Number A4979
Description Microstepping Programmable Stepper Motor Driver
Maker Allegro
Total Page 3 Pages
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A4979 Datasheet PDF





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