Information

66 | Signal Chain Guide 2013 Texas Instruments
Monitoring and Control
Motor Drivers
Get more information: www.ti.com/product/DRV8711
Stepper Pre-Driver with On-chip 1/256 Micro-Stepping Indexer and Stall Detect
DRV8711
The DRV8711 is a pre-driver IC for bipolar stepper motor drive applications. It provides
four half bridge gate drivers, each capable of driving two external N-channel MOSFETs,
one for the high side and one for the low side. It supports up to 400 mA sink and 200
mA source peak current output. The on-chip micro-stepping indexer supports step
modes from full to 1/256-step. Advanced current regulation techniques, including auto
mixed decay mode enable ultra smooth and quiet motion profiles. The motor back EMF
is monitored and system controller alerted when a stall occurs. Step/direction, PWM,
or SPI control options allows for easy interfacing to controller circuits. A SPI serial
interface is used to program the device operation. Output current (torque), step mode,
decay mode, and stall detection functions are all programmable via a SPI serial inter
-
face. Internal shutdown functions/protection is provided for over-current, short circuit,
under
-voltage lockout, gate drive over-current and over-temperature events.
DRV8711 functional block diagram
Key Features
• Steppergatedriverwith8to52V
supply voltage and 200 mA gate
current
•
Step/Direction,PWM,orSPIcontrol
options
•
1/256micro-stepon-chipindexer
• SPImanagementI/Ffor
programmability
•
Advancedcurrentregulationwith
programmable fixed time off, banking
time, and mixed decay ratio
•
Supportsslow,fast,mixed,andauto-
mixed decay modes
•
StalldetectwithoptionalbackEMF
output signal
•
Fullyprotectedwithovercurrent,
thermal, shoot-through, UVLO, and
gate drive over-current protection
Applications
• TextileMFGequipment
• Factoryautomation&robotics
• Videosecuritycameras
• Automatictellermachines(ATM)
• Stagelighting
Control
Controller
FETs
(External)
8 to +52 V
Fault
Stall
Mgmt
1/256 µ-steps
DRV8711
Stall Detect
M
* Expected release date: Q2 2013