製品概要
概要
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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特徴
- 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
