DESCRIPTION

This Combo Motor Driver uses large scale integration to incorporate several functions into the same chip.

1) Two unipolar stepper motor driver

2) A full bridge DC motor driver

3) Serial microprocesor interface The power output stages are DMOS and the input can be interfaced to a CMOS Microprocessor logic.

The phase current in the unipolar stepper motor windings is controlled by two external sensing resistors in fixed frequency chopping mode. The oscillator block provides clocks each other 180° out of phase to the two stepper motor driver in order to avoid symultaneous current peaks.

■ CHANNEL-A AND CHANNEL-B FOR UNIPOLAR STEPPER MOTORS

– LOW SIDE: RDSON = 1.2?

– HIGH SIDE ; RDSON = 1.2?

■ CHANNEL-C FOR DC MOTORS

– LOW SIDE: RDSON = 1.7?

– HIGH SIDE: RDSON = 1.2?

■ CHOPPING MODE DRIVING FOR C.L. CURRENT CONTROL ON CHA AND CHB AND O.L. VOLTAGE CONTROL ON CHC.

■ INTERNAL FOUR DRIVING LATCHES

■ 16 BIT INTERNAL SHIFT REGISTER

■ DIRECT INTERFACE TO μP

■ SERIAL DRIVING SEQUENCE LOADING

■ CMOS COMPATIBLE INPUTS

■ PRE-ALARM OUTPUT SIGNAL

■ THERMAL SHUTDOWN