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.
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.
| 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 |
The device supports two full bridges with a maximum load of 1.3 A.
Yes, it features programmable Fast-, Slow-, Mixed- and Auto- Decay Mode.
The device consumes less than 3 µA in standby mode (Tj ≤ 85 °C).