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Description

The L9942 is an integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile look-up-table to allow a flexible adaptation of the stepper motor characteristics and intended operating conditions.

It is possible to use different current profiles depending on target criteria: audible noise, vibrations, rotation speed or torque.

Features

■ Two full bridges for max. 1.3 A load (RDSON= 500 m)

■ Programmable current waveform with look-up table: 9 entries with 5 bit resolution

■ Current regulation by integrated PWM controller and internal current sensing

■ Programmable stepping mode: full, half, mini and microstepping

■ Programmable slew rate for EMC and power dissipation optimization

■ Programmable Fast-, Slow-, Mixed- and Auto Decay Mode

■ Full-scale current programmable with 3 bit resolution

■ Programmable stall detection

■ Step clock input for reduced μController requirements

■ Very low current consumption in standby mode IS< 3 μA, typ. Tj ?85 °C

■ All outputs short circuit protected with openload, overload current, temperature warning and thermal shutdown

■ The PWM signal of the internal PWM controller is available as digital output.

■ All parameters are guaranteed for 3 V < Vcc < 5.3 Vand for 7 V < Vs < 20 V

Applications