Features

 AEC-Q100 qualified

 Stepper motor driver with up to 1.35 A

current capability

 Programmable Step 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 4.1 interface for control and

diagnostics

Description

The L99SM81V is an automotive grade

integrated driver for bipolar two-phase stepper

motors capable of current controlled microstepping

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.

Applications

Bipolar 2 phase stepper motor driver for

automotive applications like adaptive front light

systems or projectors for head-up displaying