L99SM81V

Programmable stepper motor driver for automotive applications with micro-stepping and stall detection

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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 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 T_j 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

Resources

Technical Documentation

Product Specifications

	Description	Version	Size
	DS10922: Programmable stepper motor driver for automotive applications with micro-stepping and stall detection	4.0	3 MB

Application Notes

	Description	Version	Size
	AN5268: Driving high power DC motor by paralleling M0-7 VNHD7xxxAY H-Bridge and M0-7 high-side driver	1.0	467 KB
	AN5083: L99SM81V Stepper Motor Driver	2.0	511 KB

Publications and Collaterals

Flyers

	Description	Version	Size
	L99SM81V - Automotive Stepper Motor Driver	1.0	921 KB

Selection Guides

	Description	Version	Size
	Smart power solutions for car body applications	4.0	3 MB

Brochures

	Description	Version	Size
	ST’s solutions for automotive seating systems	1.0	1 MB

Tools and Software

Evaluation Tools

Product Evaluation Tools

Part Number	Manufacturer	Description
EVAL-L99SM81VQ		L99SM81VQ EVALUATION BOARD
EVAL-L99SM81VY		L99SM81VY EVALUATION BOARD

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Sample & Buy

Part Number	Package	Packing Type	Operating Temperature (°C) (min)	Operating Temperature (°C) (max)	Marketing Status	Unit Price (US$) *	Quantity	ECCN (US)	Country of Origin	More info	Order from ST	Order from Distributors
L99SM81VY	PowerSSO 36	Tube	-	-	NRND : Not Recommended for New Design. Product is in volume production only to support customers ongoing production.	-	-	EAR99	-	MORE INFO		No availability reported, please contact our Sales office
L99SM81VYTR	PowerSSO 36	Tape And Reel	-	-	Active : Product is in volume production	2.0406	1000	EAR99	-	MORE INFO		No availability reported, please contact our Sales office
L99SM81VQ6TR	VFQFPN 6X6	Tape And Reel	-	-	Active : Product is in volume production	1.8704	1000	EAR99	MALAYSIA	MORE INFO	Buy Direct Add to cart	DISTRIBUTOR AVAILABILITY
L99SM81VQ6	VFQFPN 6X6	Tray	-	-	Active : Product is in volume production	-	-	EAR99	-	MORE INFO		No availability reported, please contact our Sales office

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors

Quality & Reliability

Part Number	Marketing Status	Package	Grade	RoHS Compliance Grade
L99SM81VY	NRND	PowerSSO 36	Automotive	Ecopack2
L99SM81VYTR	Active	PowerSSO 36	Automotive	Ecopack2
L99SM81VQ6TR	Active	VFQFPN 6X6	Automotive	Ecopack2
L99SM81VQ6	Active	VFQFPN 6X6	Automotive	Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.