A4980 Datasheet, PDF (1/44 Pages) Allegro MicroSystems – The A4980 is a flexible microstepping motor driver with built-in translator for easy operation.

A4980
Automotive, Programmable Stepper Driver
Features and Benefits
• Peak motor current up to ±1.4 A, 28 V
• Low R_DS(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 OVLO, UVLO, and Thermal Shutdown circuitry
• Crossover-current protection
• Short circuit, and open load diagnostics
• Hot and cold thermal warning
• Stall detect features
• SPI-compatible or simple Step and Direction motion control
• Highly configurable via SPI-compatible serial interface
Applications
• Automotive stepper motors
• Engine management
• Headlamp positioning
Package: 28-pin TSSOP with exposed
thermal pad (suffix LP)
Not to scale
Description
TheA4980 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 28 V and ±1.4 A. The A4980
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 overvoltage and undervoltage
lockout.
The A4980 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 2 VCP VBB
VDD
STEP
DIR
OAP
MS0
MS1
ENABLE
OAM
RESETn
DIAG
REF
SDI
SDO
SCK
STRn
VREG
OSC
OBP
OBM
SENSA
SENSB
AGND PGND
Typical Applications
Automotive
12V Power Net
Logic
Supply
Stepper
Motor
Micro-
controller
or
ECU
CP1 2 VCP VBB
VDD
STEP
DIR
OAP
MS0
MS1
ENABLE
OAM
RESETn
DIAG
REF
SDI
SDO
SCK
STRn
VREG
OSC
OBP
OBM
SENSA
SENSB
AGND PGND
Automotive
12V Power Net
Stepper
Motor
Serial Interface Control
A4980-DS, Rev. 2
Parallel Control