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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
Download
All tools & software
All resources
Product Specifications (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 19 Sep 2016 |
19 Sep 2016
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Application Notes (2)
| Resource title | Latest update | |||
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| 13 May 2019 |
13 May 2019
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| 13 May 2019 |
13 May 2019
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Technical Notes & Articles (1)
| Resource title | Latest update | |||
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| 13 Sep 2018 |
13 Sep 2018
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User Manuals (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 20 Sep 2013 |
20 Sep 2013
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Selection Guides (2)
| Resource title | Latest update | |||
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| 02 Apr 2020 |
02 Apr 2020
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| 08 Oct 2020 |
08 Oct 2020
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Brochures (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 02 Mar 2020 |
02 Mar 2020
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EDA Symbols, Footprints and 3D Models
STMicroelectronics - L9942
Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.
Symbols
Footprints
3D models
Quality and Reliability
| 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.
Sample & Buy
| Part Number | Order from Distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| L9942XP1TR | 4 distributors | Free Sample Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | PowerSSO 24 | - | - | MALAYSIA | 2.3 / 1k | |
| L9942XP1 | 1 distributors | Free Sample Buy Direct |
Active
|
EAR99 | NEC | Tube | PowerSSO 24 | - | - | MALAYSIA | 2.3 / 1k | |
(*) 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
