Overview
The L9780TR, produced by STMicroelectronics, is an integrated circuit (IC) designed to interface with a variety of wide range air fuel sensors. This device is specifically engineered to manage the oxygen pump of these sensors using a voltage controlled current source (VCCS). The VCCS reference is generated by a PI controller with an external compensation network, allowing the device to adapt to different sensors. The user can select between two different compensation networks using the SPI interface, ensuring compatibility with most sensors on the market.
The L9780TR features an internal timing state machine that automates the sequencing of the measurement process, with all main time values configurable via SPI. Additionally, it drives an external FET to control the sensor heater and includes comprehensive diagnostic capabilities to protect the sensor and I/O against shorts.
Key Specifications
| Parameter | Description |
|---|---|
| Package | 48 pin LQFP (7x7x1.4 mm) |
| Technology | BCD5s_70 V |
| Operating Temperature Range | -40°C to 150°C |
| Internal Oscillator | 4 MHz |
| Internal Supply | -5 V |
| Digital Input/Output Compatibility | 5 V or 3.3 V voltage supply |
| SPI Interface | Synchronous or asynchronous functionality with fault detection |
| A/D Converter | 10-bit multiplexed |
| Heater FET Driver | With diagnostic (short to battery, short to ground, open circuit) |
| Diagnostic Capabilities | Short to battery and ground diagnostics on various pins |
Key Features
- Voltage controlled current source (VCCS) pump cell driver with selectable voltage clamp, offset compensation, and diagnostic capabilities.
- Impedance measurement of the reference cell.
- 10-bit multiplexed A/D converter.
- Scaling amplifier with sample & hold and offset compensation.
- Control voltage amplifier with sample & hold and offset compensation.
- Synchronous or asynchronous functionality selectable via SPI.
- Heater FET driver with diagnostic capabilities (short to battery, short to ground, open circuit).
- Four possible levels for clean current.
- SPI interface with fault detection.
- Digital input and outputs compatible with 5 V or 3.3 V voltage supply.
- Two channels available to connect compensation networks.
- Comprehensive diagnostic capabilities including short to battery and ground diagnostics.
Applications
The L9780TR is primarily used in automotive applications, particularly for managing wide range air fuel sensors. It is designed to be compatible with most sensors on the market, making it a versatile component for various automotive systems that require precise air-fuel ratio control.
Q & A
- What is the primary function of the L9780TR?
The L9780TR is designed to interface with wide range air fuel sensors, managing the oxygen pump using a voltage controlled current source (VCCS).
- What type of package does the L9780TR come in?
The L9780TR comes in a 48 pin LQFP (7x7x1.4 mm) package.
- What is the operating temperature range of the L9780TR?
The operating temperature range is -40°C to 150°C.
- Does the L9780TR have internal diagnostic capabilities?
- How is the VCCS reference generated in the L9780TR?
The VCCS reference is generated by a PI controller with an external compensation network.
- Can the L9780TR be used with different types of sensors?
- What is the role of the SPI interface in the L9780TR?
The SPI interface allows for synchronous or asynchronous functionality selection and includes fault detection.
- Does the L9780TR have a built-in oscillator?
- What is the purpose of the heater FET driver in the L9780TR?
The heater FET driver controls the sensor heater and includes diagnostic capabilities for shorts and open circuits.
- Is the L9780TR RoHS compliant?
