Overview
The L9942XP1TR, produced by STMicroelectronics, is an integrated stepper motor driver designed for bipolar stepper motors. It features advanced capabilities such as microstepping and a programmable current profile look-up-table, allowing for flexible adaptation to various stepper motor characteristics and operating conditions. This driver is particularly suited for applications requiring precise control over motor performance, including adjustments for audible noise, vibrations, rotation speed, and torque.
Key Specifications
| Parameter | Description |
|---|---|
| Package | PowerSSO24 |
| Junction Temperature Range | -40°C to 150°C |
| Load Current per Bridge | Up to 1.3 A (RDSON = 500 mΩ) |
| Current Waveform Resolution | 9 entries with 5-bit resolution |
| Stepping Modes | Full, half, mini, and microstepping |
| Decay Modes | Slow, fast, mixed, and auto-decay |
| Full-scale Current Resolution | 3-bit resolution |
| Standby Current | < 3 µA (typ.) at Tj ≤ 85 °C |
| Supply Voltages | 3 V < Vcc < 5.3 V, 7 V < Vs < 20 V |
Key Features
- Programmable current waveform with a look-up table for flexible current profiles.
- Integrated PWM controller and internal current sensing for precise current regulation.
- Programmable stepping modes including full, half, mini, and microstepping.
- Programmable slew rate for EMC and power dissipation optimization.
- Programmable decay modes: slow, fast, mixed, and auto-decay.
- Full-scale current programmable with 3-bit resolution.
- Programmable stall detection to prevent motor stall in applications like headlamp leveling and bending light.
- Step clock input to reduce microcontroller requirements.
- All outputs are short-circuit protected with open-load, overload current, temperature warning, and thermal shutdown.
- PWM signal of the internal PWM controller available as a digital output.
Applications
The L9942XP1TR is primarily used in automotive applications, such as:
- Light leveling systems.
- Bending light systems.
- Throttle control systems.
Its advanced features make it suitable for any application requiring precise and flexible control over bipolar stepper motors.
Q & A
- What is the primary function of the L9942XP1TR?
The L9942XP1TR is an integrated stepper motor driver for bipolar stepper motors, providing features like microstepping and programmable current profiles.
- What are the key stepping modes supported by the L9942XP1TR?
The driver supports full, half, mini, and microstepping modes.
- How does the L9942XP1TR manage current regulation?
The driver uses an integrated PWM controller and internal current sensing for precise current regulation.
- What are the programmable decay modes available in the L9942XP1TR?
The driver supports slow, fast, mixed, and auto-decay modes.
- What is the purpose of the programmable stall detection feature?
The programmable stall detection prevents the motor from running too long in stall conditions, which is particularly useful in applications like headlamp leveling and bending light.
- What are the typical standby current and junction temperature range for the L9942XP1TR?
The standby current is less than 3 µA (typ.) at Tj ≤ 85 °C, and the junction temperature range is -40°C to 150°C.
- What are the supply voltage ranges for the L9942XP1TR?
The supply voltage ranges are 3 V < Vcc < 5.3 V and 7 V < Vs < 20 V.
- How is the slew rate optimized in the L9942XP1TR?
The slew rate can be programmed to optimize EMC and power dissipation.
- What kind of protection does the L9942XP1TR offer for its outputs?
All outputs are protected against short circuits, open loads, overload current, temperature warnings, and thermal shutdown.
- Can the PWM signal of the internal PWM controller be accessed externally?
