L99SM81VY

L99SM81VY

L99SM81VQ6 NRND

Programmable stepper motor driver for automotive applications with micro-stepping and stall detection
Operating RangeAutomotive
Supply Voltage Min Volt6.0
Supply Voltage Max Volt28.0
ECCN USEAR99
ECCN EUNEC
Packing TypeTray
ROHS Compliance GradeEcopack2
GradeAutomotive
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
      mode
    • 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

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.

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