Overview
The L9945TR is an automotive fully configurable 8-channel high/low side MOSFET pre-driver designed by STMicroelectronics. This integrated circuit is tailored for use in automotive applications, supporting both 12V and 24V battery systems. It is housed in a 64-pin TQFP package and is capable of driving resistive, capacitive, and inductive loads, making it versatile for various automotive control functions such as lights, motors, and valves.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Temperature (°C) Min | -40 |
| Operating Temperature (°C) Max | 150 |
| Operating Voltage Min (V) | 3.8 |
| Operating Voltage Max (V) | 36 |
| Input Voltage Range (V) | 4.5 to 5.5 |
| Output Voltage Range (V) | 10 to 14 |
| Input Current (mA) | 50 |
| Number of Channels | 8 |
| Package/Case | TQFP-64 |
| Packing Type | Tape and Reel |
| RoHS Compliant | Yes (Ecopack2) |
| Qualification | AEC-Q100 |
Key Features
- Configurable watchdog timer.
- Redundant output shutdown.
- Digital diagnostics reporting, including short circuit to battery, open load, and short circuit to ground.
- Programmable gate charge/discharge currents to improve EMI behavior.
- Highly flexible overcurrent sensing implementation with 64 programmable overcurrent thresholds.
- Ultra-fast output shutdown in case of overcurrent.
- Current limitation for H-Bridge configuration.
- 32-bit SPI protocol for configuration and diagnostics.
- Safety features including fast switch off, redundant output disable, Built In Self Test (BIST), and Hardware Self Check (HWSC).
- 10-bit ADC for battery and die temperature measurements.
Applications
The L9945TR is designed for various automotive control applications, including but not limited to:
- Driving lights, motors, and valves.
- Controlling safety-relevant loads with dedicated enable pins.
- Operating in H-Bridge and peak & hold configurations.
- Monitoring and controlling loads in 12V and 24V automotive systems).
Q & A
- Q: Is the L9945TR compatible with 24V automotive systems?
A: Yes, the L9945TR is designed to work with both 12V and 24V automotive systems).
- Q: What is the operating temperature range of the L9945TR?
A: The operating temperature range is from -40°C to 150°C).
- Q: How many channels does the L9945TR have?
A: The L9945TR has 8 configurable channels).
- Q: What types of loads can the L9945TR drive?
A: The L9945TR can drive resistive, capacitive, and inductive loads).
- Q: Does the L9945TR support PWM control?
A: Yes, all outputs of the L9945TR can be PWM controlled).
- Q: What safety features does the L9945TR include?
A: The L9945TR includes features such as fast switch off, redundant output disable, Built In Self Test (BIST), and Hardware Self Check (HWSC)).
- Q: How is the L9945TR configured and diagnosed?
A: The L9945TR is configurable via a 32-bit SPI protocol and supports daisy chain operation for diagnostics).
- Q: Is the L9945TR RoHS compliant?
A: Yes, the L9945TR is RoHS compliant (Ecopack2)).
- Q: What is the packaging type of the L9945TR?
A: The L9945TR is packaged in Tape and Reel format).
- Q: What qualification standard does the L9945TR meet?
A: The L9945TR meets the AEC-Q100 qualification standard).
