Key facts
- Brand
- STMicroelectronics
- Model
- L9942
- Category
- Motor
- Documents
- 3
- Languages
- EN
- Last added
- 2012-08-08
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STMicroelectronics L9942 Integrated Stepper Motor Driver Datasheet
The L9942 is an integrated stepper motor driver designed specifically for bipolar stepper motors. It supports microstepping with a programmable current profile look-up table containing 9 entries at 5-bit resolution, allowing flexible adaptation of motor characteristics such as audible noise, vibrations, rotation speed, or torque.
The device features two full bridges capable of driving a maximum load of 1.3 A (with an RDSON of 500 mΩ). It includes programmable decay modes (Fast-, Slow-, Mixed-, and Auto-), stall detection to prevent overheating during position alignment, and short-circuit protection with open-load and overload current monitoring.
STMicroelectronics L9942 specifications
| Max load current per bridge | 1.3 A |
|---|---|
| On-resistance (RDSON) | 500 mΩ |
| Current profile resolution | 5 bit |
| Supply voltage range (Vcc) | 3 V to 5.3 V |
| Motor supply voltage range (Vs) | 7 V to 20 V |
| Stall detection threshold | Programmable |
Source: STMicroelectronics L9942 Integrated Stepper Motor Driver Datasheet
All STMicroelectronics L9942 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
What is the maximum load current for the L9942?
The device supports two full bridges with a maximum load of 1.3 A.
From: STMicroelectronics L9942 Integrated Stepper Motor Driver Datasheet
Does the L9942 support auto-decay mode?
Yes, it features programmable Fast-, Slow-, Mixed- and Auto- Decay Mode.
From: STMicroelectronics L9942 Integrated Stepper Motor Driver Datasheet
What is the primary use of the L9942?
The L9942 is an integrated stepper motor driver used primarily in automotive head lamp leveling.
From: AN3327 L9942 Back EMF Stall Detection Algorithm Application Note
Can the L9942 be used for other applications?
Yes, it can be used for adaptive head lamp leveling, HVAC blend door actuator control, EGR valve and throttle control.
From: AN3327 L9942 Back EMF Stall Detection Algorithm Application Note
What are the recommended applications for the L9942?
The device is designed for automotive applications such as headlamp leveling, steerable lights, and adaptive front lighting.
From: STMicroelectronics AN2650 L9942 Stepper Motor Driver Application Note
How does the L9942 prevent electrical overstress during shutdown?
It requires a buffer capacitor to absorb energy fed back to the supply voltage when the motor shuts down.
From: STMicroelectronics AN2650 L9942 Stepper Motor Driver Application Note