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L9942 Datasheet Integrated stepper motor driver

Manufacturer: STMicroelectronics

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General 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.

The decay mode used in PWM-current control circuit can be programmed to slow-, fast-, mixed-and autodecay.

Overview

L9942 Integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current.

Key Features

  • Two full bridges for max. 1.3 A load (RDSON = 500 mī—).
  • 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 AutoDecay Mode.
  • Full-scale current programmable with 3 bit resolution.
  • Pro.

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