Overview
The L9780AC1, produced by STMicroelectronics, is an Integrated Circuit (IC) designed to interface with a variety of wide range air fuel sensors. This device is crucial in automotive applications, managing the oxygen pump of the air fuel sensor through 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.
Key Specifications
| Parameter | Description |
|---|---|
| Package | 48 pin LQFP (7x7x1.4 mm) |
| Technology | BCD5s_70 V |
| Operating Temperature Range | -40°C to 125°C |
| Voltage Supply | 2.9 V to 5.5 V |
| Internal Oscillator | 4 MHz |
| RoHS Compliance | Ecopack2 |
| Grade | Automotive |
Key Features
- Voltage controlled current source (VCCS) pump cell driver with selectable voltage clamp, offset compensation, diagnostic (short to battery), and 2 output channels
- Impedance measurement of 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 (short to battery, short to ground, open circuit)
- 4 possible levels for clean current
- SPI with fault detection
- Digital input and outputs compatible with 5 V or 3.3 V voltage supply
- 2 channels available to connect compensation networks
- Short to battery diagnostic on functional ground (pin SR) and voltage from reference cell (pin INRC)
- -5 V internal supply
Applications
The L9780AC1 is primarily used in automotive applications, particularly in engine management systems. It is designed to interface with wide range air fuel sensors, making it essential for maintaining optimal engine performance and emissions control.
Q & A
- What is the primary function of the L9780AC1 IC?
The L9780AC1 is designed to interface with wide range air fuel sensors, managing the oxygen pump through a voltage controlled current source (VCCS).
- What type of package does the L9780AC1 come in?
The L9780AC1 comes in a 48 pin LQFP package (7x7x1.4 mm).
- What is the operating temperature range of the L9780AC1?
The operating temperature range is -40°C to 125°C.
- What is the voltage supply range for the L9780AC1?
The voltage supply range is 2.9 V to 5.5 V.
- Does the L9780AC1 support SPI communication?
Yes, the L9780AC1 supports SPI communication with fault detection.
- What kind of diagnostic features does the L9780AC1 have?
The L9780AC1 includes diagnostics for short to battery, short to ground, and open circuit conditions, as well as short to battery diagnostics on functional ground and voltage from the reference cell.
- Is the L9780AC1 compatible with different air fuel sensors?
Yes, the L9780AC1 is fully compatible with most wide range air fuel sensors on the market.
- What is the purpose of the internal timing state machine in the L9780AC1?
The internal timing state machine automatically manages all the operations needed for the correct sequencing of the measurement process.
- Does the L9780AC1 have a heater FET driver?
Yes, the L9780AC1 includes a heater FET driver with diagnostic capabilities.
- Is the L9780AC1 RoHS compliant?
Yes, the L9780AC1 is RoHS compliant with an Ecopack2 grade.
