Overview
The L9305EP-TR, produced by STMicroelectronics, is a configurable, monolithic solenoid driver IC designed for the control of linear solenoids in various automotive applications. It is particularly suited for automatic transmission, electronic stability control, and active suspension systems. The device features four independent channels that can be configured as either low-side or high-side drivers in any combination. This flexibility, along with integrated current sensing and advanced safety features, makes it a robust solution for demanding automotive environments.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Number of Channels | Independent current controlled drivers | 4 |
| Current Range (Normal) | Programmable current range | 0-1.5 A, resolution 0.25 mA |
| Current Range (Extended) | Programmable current range | 0-2 A, resolution 0.33 mA |
| Current Accuracy (Normal Range) | Accuracy in 0 to 0.5 A and 0.5 A to 1.5 A ranges | ± 5 mA in 0 to 0.5 A, ± 1% in 0.5 A to 1.5 A |
| Current Accuracy (Extended Range) | Accuracy in 0 to 0.3 A, 0.3 A to 0.5 A, and 0.5 A to 2 A ranges | ± 15 mA in 0 to 0.3 A, ± 5% in 0.3 A to 0.5 A, ± 4% in 0.5 A to 2 A |
| Max Driver RDSON | Maximum on-resistance of the driver transistor | 375 mΩ @ 175 °C |
| Current Set-Point Resolution | Resolution of the current set-point | 13-bit |
| Communication Interface | Type of communication interface | 32-bit SPI with 5-bit CRC message verification |
| Package Options | Available package types | PowerSSO36, TQFP48 |
| Operating Temperature Range | Range of operating junction temperature | -40 °C to +175 °C |
Key Features
- AEC-Q100 Qualified: Meets the stringent requirements for automotive applications.
- Integrated Current Sense Path: Ensures accurate current measurement for each channel.
- Programmable Dither Function: Allows for configurable dither modulation over the set-point current.
- Selectable Driver Slew Rate Control: Provides flexibility in controlling the driver slew rate.
- Safety Features: Includes high side fail-safe ENABLE switch pre-driver with VDS monitoring, redundant safe enable path, and advanced diagnosis and monitoring using BIST.
- Temperature Sensor and Monitoring: Monitors and reports temperature conditions.
- Redundant Current Sensing: Guarantees redundancy of the current measurement for each channel.
- Secure Serial Communications: Uses address feedback, 5-bit CRC, frame counter, and long/short frame detection for secure communication.
- Full ISO26262 Compliance: Ready for ASIL-D systems.
Applications
- Automatic Transmission: Controls linear solenoids in automatic transmission systems.
- Electronic Stability Control: Used in electronic stability control systems to ensure vehicle stability.
- Active Suspension: Controls solenoids in active suspension systems for improved vehicle handling and comfort.
Q & A
- What is the primary function of the L9305EP-TR?
The L9305EP-TR is a configurable, monolithic solenoid driver IC designed for the control of linear solenoids in automotive applications such as automatic transmission, electronic stability control, and active suspension.
- How many channels does the L9305EP-TR have?
The device features four independent channels that can be configured as either low-side or high-side drivers.
- What is the programmable current range of the L9305EP-TR?
The current is programmable in the range of 0-1.5 A (normal range) with a resolution of 0.25 mA, or 0-2 A (extended range) with a resolution of 0.33 mA.
- What safety features does the L9305EP-TR include?
The device includes high side fail-safe ENABLE switch pre-driver with VDS monitoring, redundant safe enable path, advanced diagnosis and monitoring using BIST, and temperature sensor and monitoring.
- What communication interface does the L9305EP-TR use?
The device uses a 32-bit SPI interface with 5-bit CRC message verification for configuration and control.
- What are the available package options for the L9305EP-TR?
The device is available in PowerSSO36 and TQFP48 packages.
- Is the L9305EP-TR compliant with automotive standards?
Yes, it is AEC-Q100 qualified and fully compliant with ISO26262 for ASIL-D systems.
- What is the operating temperature range of the L9305EP-TR?
The operating junction temperature range is from -40 °C to +175 °C.
- Does the L9305EP-TR support redundant current sensing?
Yes, the device guarantees redundancy of the current measurement for each channel.
- How does the L9305EP-TR ensure secure communication?
The device uses secure serial communications with address feedback, 5-bit CRC, frame counter, and long/short frame detection.
