Rainbow Electronics ATA6830 - Manual

1
Features
• 2-Phase 1 A Stepping Motor Driver
• Compensated Half Step Operation
• Chopper Current Control
• Unidirectional Single Wire Bus Interface with Error Feedback
• Intelligent Travel Operation Control
• Referencing by Extending or Retracting
Application
• Dynamic Headlamp Adjustment
Benefits
• Error Recognition with Feedback
• Short Circuit Protected Outputs
• Overtemperature Warning and Shut Off
• Supply Voltage Supervision
Electrostatic sensitive device.
Observe precautions for handling.
Description
The circuit serves to control a stepping motor for dynamic headlamp beam adjustment
in automobiles. Two chopper-controlled H-bridges serve as the stepping motor driver.
The circuit receives the commands to control the stepping motor by means of a unidi-
rectional serial single-wire bus.
An integrated process control independently moves the stepping motor into the new
desired position. This allows it to be automatically accelerated and slowed down. The
stepping motor is operated in compensated half-step operation. The maximum clock
frequency at which the stepping motor is operated depends on the supply voltage, the
chip temperature, the operating mode, and position difference.
Intelligent
Stepper Motor
Driver
ATA6830
Rev. 4575B–BCD–01/03