Programmable Stepper Motor Driver for Automotive Applications with Micro-Stepping and Stall Detection

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1 - 9$5.580%
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Parameter NameParameter Value
Operating RangeAutomotive
Supply Voltage Min Volt6.0
Supply Voltage Max Volt28.0
Packing TypeTape And Reel
RoHs compliantEcopack2
Package NamePowerSSO 36

The L99SM81V is an automotive grade integrated driver for bipolar two-phase stepper motors capable of current controlled micro-stepping with programmable amplitude. The device features a 5 V voltage regulator to supply external sensors.

The integrated Serial Peripheral Interface (SPI) makes it possible to adjust device parameters, control all operating modes and read out diagnostic information. Digital I/Os are also optionally usable for more flexible and reliable application control.

Key features
  • AEC-Q100 qualified
  • Stepper motor driver with up to 1.35 A current capability
  • Programmable stepping mode:
    • Full step, Half step, Mini step, 1/8 Micro
      step, 1/16 Micro step
  • Current regulation by integrated PWM control with fully integrated current sensing
  • Equivalent 10 bit resolution on current regulation loop:
    • Two 4-bit
      programmable full scale current amplitudes: one for RUN and one for HOLD
    • 6-bit DAC for reference current generation (whatever
      programmed full scale amplitude)
  • 4 programmable decay modes:
    • Slow-mode, mixed-mode and 2x automatically
      selected decay-modes
  • 3x programmable inputs for direct control of step clock, direction, hold and step modes
  • 1x programmable analog output for Tj measurement or band-gap reference
  • 2x programmable digital outputs for internally generated PWM ON duty cycles, error signals, coils voltage measurement synchronization signals
  • Programmable MOSFETs switching speed: four options for EMC and power dissipation trade-off optimization
  • PWM frequency wobbling for reduction of conducted EM energy
  • Outputs protection and diagnosis (open load, short to battery, short to GND)
  • Integrated ADC for coil voltage measurement and stall detection
  • 5 V low drop voltage regulator short-circuit protected
  • Very low current consumption in standby mode (typ. 10 µA)
  • Thermal warning and shutdown
  • ST SPI 4.0 interface for control and diagnostics