3973 Datasheet (Allegro MicroSystems) - DUAL DMOS FULL-BRIDGE MICROSTEPPING PWM MOTOR DRIVER

3973, DUAL DMOS FULL-BRIDGE MICROSTEPPING PWM MOTOR DRIVER

Serial Interface.

The A3973SB/SLB is controlled via a 3-wire (clock, data, strobe) serial port.

The programmable functions allow maximum flexibility in configuring the PWM to the motor drive requirements.

The serial data is written as two 19-bit words: 1 bit to select the word and 18 bits of data.

3973 PRELIMINARY INFORMATION (Subject to change without notice) December 1, 2000 CHARGE PUMP DUAL DMOS FULL-BRIDGE MICROSTEPPING PWM MOTOR DRIVER Designed for pulse-width modulated (PWM) current control of bipolar microstepping stepper motors, the A3973SB and A3973SLB are capable of continuous output currents to ±1 A and operating voltages to 35 V.

Internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-de

3973 Features

* I I I I I I I I I I I I ±1 A, 35 V Continuous Output Rating Low rDS(on) DMOS Output Drivers Optimized Microstepping via 6-Bit Linear DACs Programmable Mixed, Fast, and Slow Current-Decay Modes 4 MHz Internal Oscillator for Digital Timing Serial-Interface Controls Chip Functions Synchronous Rectifica