AC7840-POSITION
High-precision position sensor interface with 24-bit ADC and sine/cosine processing for automotive position sensing
Product Overview
Description
The AC7840-POSITION is a high-precision position sensor interface designed for demanding automotive position sensing applications.
With 24-bit ADC, sine/cosine signal processing, and ASIL-B support, it is ideal for throttle position, pedal position, and steering angle sensing.
The device includes signal conditioning, fault detection, and SENT interface for automotive sensor networks.
Product Series
AC
Primary Application
Throttle position sensing
Key Features
- 24-bit ultra-high-resolution ADC
- Sine/cosine signal processing
- Multi-sensor input support
- 0.1% accuracy over temperature
- ASIL-B functional safety features
- Sensor fault detection
- SENT protocol interface
- AEC-Q100 Grade 1 qualified
Specifications
| Supply Voltage | 3.3V to 5V |
|---|---|
| ADC Resolution | 24-bit |
| Input Type | Sine/Cosine, Hall, Potentiometer |
| Accuracy | 0.1% over temperature |
| Temperature Range | -40°C to +125°C |
| Safety Level | ASIL-B support |
Applications
Throttle position sensing
Electronic system design
Accelerator pedal position
Electronic system design
Steering angle measurement
Data acquisition and conversion
Brake pedal position
Electronic system design
Transmission position sensing
Electronic system design
FAE Expert Insights
"The AC7840-POSITION is my recommended solution for safety-critical position sensing applications. The 24-bit ADC provides exceptional resolution for precise position measurement, while the sine/cosine processing enables accurate angle calculation from resolver or inductive sensors. I have successfully used this interface in throttle control and pedal position applications requiring ASIL compliance. The ASIL-B features including redundant measurement channels and diagnostic capabilities provide the reliability required for safety systems. The SENT interface simplifies integration into automotive sensor networks. For high-precision safety-critical position sensing, this interface offers excellent performance."
High-precision position sensor interface with ASIL-B for safety-critical automotive applications
— Jennifer Liu, BeiLuo
Frequently Asked Questions
What is sine/cosine signal processing?
Sine/cosine signal processing is used with resolver and inductive position sensors that output sine and cosine signals proportional to angle. The AC7840-POSITION processes these signals to calculate precise angular position using arctangent algorithms. This provides absolute position measurement with high resolution.
Use sine/cosine processing for resolver and inductive sensors requiring absolute position.
What position sensors are supported?
The AC7840-POSITION supports resolver sensors, inductive position sensors, Hall effect sensors, and potentiometer sensors. Each sensor type has appropriate signal conditioning. The 24-bit ADC provides high resolution for all sensor types. Sensor selection depends on accuracy requirements and environmental conditions.
Select sensor type based on accuracy needs and operating environment.
What is ASIL-B support for position sensing?
ASIL-B support includes redundant measurement channels, comprehensive diagnostics, and fault detection for safety-critical position sensing. Dual ADC channels provide redundant angle measurement. Diagnostic features detect sensor faults and signal anomalies. These features enable use in safety systems like throttle control.
ASIL-B features support safety-critical position sensing applications.
What is SENT protocol interface?
SENT (Single Edge Nibble Transmission) is an automotive sensor communication protocol. The SENT interface provides high-resolution data transmission from sensor to ECU. It is widely used for position and pressure sensors in vehicles. SENT offers better EMC performance than analog interfaces.
SENT interface provides robust automotive sensor communication.
What accuracy can be achieved with 24-bit ADC?
The 24-bit ADC provides theoretical resolution of 1 part in 16 million. For a 360-degree range, this provides sub-arcsecond resolution. Actual accuracy depends on sensor quality and signal conditioning. The 0.1% accuracy specification includes all error sources over temperature.
24-bit ADC provides exceptional resolution for high-precision position sensing.