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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 5Â 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 1.35Â 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
- 5Â 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
Sample & Buy
| Part Number | Package | Packing Type | Temperature (°C) | Marketing Status | Budgetary Price (US$)* | Quantity | ECCN (US) | Country of Origin | More info | Order from Distributors | Order from ST | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| L99SM81VY | PowerSSO 36 | Tube | - | - |
NRND
|
- | - | EAR99 | - | No availability of distributors reported, please contact our sales office | ||
| L99SM81VYTR | PowerSSO 36 | Tape And Reel | - | - |
Active
|
2.0406 | 1000 | EAR99 | - | Check Availability | ||
| L99SM81VQ6TR | VFQFPN 6X6 | Tape And Reel | - | - |
Active
|
1.8704 | 1000 | EAR99 | MALAYSIA | Check Availability | Buy now | |
| L99SM81VQ6 | VFQFPN 6X6 | Tray | - | - |
Active
|
- | - | EAR99 | - | No availability of distributors reported, please contact our sales office | ||
L99SM81VY
Package
PowerSSO 36Packing Type
TubeUnit Price (US$)
*L99SM81VYTR
Package
PowerSSO 36Packing Type
Tape And ReelUnit Price (US$)
2.0406*L99SM81VQ6
Package
VFQFPN 6X6Packing Type
TrayUnit Price (US$)
*(*) 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
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Evaluation Tools
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Picture Part number Manufacturer Description EVAL-L99SM81VQ -- L99SM81VQ EVALUATION BOARD EVAL-L99SM81VY -- L99SM81VY EVALUATION BOARD
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| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| L99SM81VQ6 |
Active
|
VFQFPN 6X6 | Automotive | Ecopack2 | |
| L99SM81VQ6TR |
Active
|
VFQFPN 6X6 | Automotive | Ecopack2 | |
| L99SM81VY |
NRND
|
PowerSSO 36 | Automotive | Ecopack2 | |
| L99SM81VYTR |
Active
|
PowerSSO 36 | 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.
