ATA6830-PKH Microchip

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 Intelligent Stepper Motor Benefits Error Recognition with Feedback Driver Short Circuit Protected Outputs Overtemperature Warning and Shut Off Supply Voltage Supervision ATA6830 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. Rev. 4575CBCD05/03 1Figure 1. Block Diagram VDD BUS Voltage Regulator VSS UART VBAT1A Command Interpreter VBAT1B SM1A SM1B SRA SRB SM2A SM2B VBAT2A Test Logic VBAT2B ATA6830 Pin Configuration Figure 2. Pinning QFN 28 28 27 26 25 24 23 22 1 21 VBAT1A VBAT1B 2 20 n.c. n.c. 3 19 SM1A SM1B MLP 7x7mm 0.8mm pitch SRA 4 ATA6830 18 SRB 28 lead 5 17 SM2A SM2B 6 16 n.c. n.c. VBAT2A 7 15 VBAT2B 8 9 10 11 12 13 14 2 ATA6830 4575CBCD05/03 AGND Biasing RSET n.c. n.c. Oscillator COS SCI1 COS Temperature Monitor Driver Logic SCO1 RSET Supply Monitor Cruising Service Control SCI2 AGND SCO2 VSS Driver Logic TA VDD TTEMP BUS