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The L9942 is an integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile look-up-table to allow a flexible adaptation of the stepper motor characteristics and intended operating conditions. It is possible to use different current profiles depending on target criteria: audible noise, vibrations, rotation speed or torque. The decay mode used in PWM-current control circuit can be programmed to slow-, fast-, mixed-and auto-decay. In autodecay mode device will use slow decay mode if the current for the next step will increase and the fast decay or mixed decay mode if the current will decrease. The programmable stall detection is useful in case of head lamp leveling and bending light application, by preventing to run the motor too long time in stall for position alignment. If a stall is detected, the alignment process is closed and the noise is minimized.
Key Features
- Two full bridges for max. 1.3 A load(RDSON= 500 mΩ)
- Programmable current waveform with look-up table: 9 entries with 5 bit resolution
- Current regulation by integrated PWM controller and internal current sensing
- Programmable stepping mode: full, half, mini and microstepping
- Programmable slew rate for EMC and power dissipation optimization
- Programmable Fast-, Slow-, Mixed- and Auto-Decay Mode
- Full-scale current programmable with 3 bit resolution
- Programmable stall detection
- Step clock input for reduced μController requirements
- Very low current consumption in standby mode IS< 3 μA, typ. Tj≤ 85 °C
- All outputs short circuit protected with openload, overload current, temperature warning and thermal shutdown
- The PWM signal of the internal PWM controller is available as digital output.
- All parameters are guaranteed for 3 V < Vcc < 5.3 V and for 7 V < Vs < 20 V
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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 | |||||||||||
| L9942XP1TR | PowerSSO 24 | Tape And Reel | - | - | Active | 2.3 | 1000 | EAR99 | MALAYSIA | Check Availability | Get sample | |
| L9942XP1 | PowerSSO 24 | Tube | - | - | Active | 2.3 | 1000 | EAR99 | MALAYSIA | Check Availability | Get sample | |
(*) 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
Evaluation Tools
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Picture Part number Manufacturer Description 
EVAL-L9942 -- Evaluation board for L9942XP microstepping fully integrated motor driver Part NumberEvaluation board for L9942XP microstepping fully integrated motor driver
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| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| L9942XP1 | Active | PowerSSO 24 | Automotive | Ecopack2 | |
| L9942XP1TR | Active | PowerSSO 24 | 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.
