AC7801-SENSOR
AEC-Q100 qualified pressure sensor interface with 16-bit ADC and temperature compensation for TPMS applications
Product Overview
Description
The AC7801-SENSOR is an automotive-qualified pressure sensor signal conditioner designed for tire pressure monitoring and pressure sensing applications.
With 16-bit ADC, integrated temperature compensation, and resistive bridge excitation, it provides accurate pressure measurement.
The device includes LIN interface for automotive network integration and low-power modes for battery-powered TPMS.
Product Series
AC
Primary Application
Tire pressure monitoring systems
Key Features
- 16-bit high-resolution ADC
- Resistive bridge sensor excitation
- Integrated temperature compensation
- LIN 2.1 interface for automotive networks
- Low-power sleep mode (0.5 microamps)
- Over-voltage and reverse polarity protection
- Pressure and temperature measurement
- AEC-Q100 Grade 1 qualified
Specifications
| Supply Voltage | 2.1V to 3.6V |
|---|---|
| ADC Resolution | 16-bit |
| Input Type | Resistive bridge |
| Accuracy | 0.5% over temperature |
| Temperature Range | -40°C to +125°C |
| Interface | LIN 2.1 / Analog output |
Applications
Tire pressure monitoring systems
Electronic system design
Engine oil pressure sensors
Sensor signal conditioning
Fuel pressure sensors
Sensor signal conditioning
HVAC pressure sensors
Sensor signal conditioning
Brake pressure sensors
Sensor signal conditioning
FAE Expert Insights
"The AC7801-SENSOR is an excellent solution for automotive pressure sensing applications, particularly TPMS. The integrated 16-bit ADC provides sufficient resolution for precise pressure measurement while the temperature compensation ensures accuracy across the automotive temperature range. I have successfully used this interface in multiple TPMS projects with excellent results. The LIN interface simplifies integration into vehicle networks, and the low-power sleep mode is essential for battery-powered tire sensors. The integrated bridge excitation eliminates external components, reducing BOM cost. The 0.5% accuracy over temperature meets TPMS regulatory requirements. For cost-sensitive pressure sensing applications, this interface offers excellent value."
Integrated pressure sensor interface with LIN for TPMS and automotive pressure sensing
— Dr. Michael Chen, BeiLuo
Frequently Asked Questions
What pressure sensor types work with AC7801-SENSOR?
The AC7801-SENSOR is designed for resistive bridge pressure sensors commonly used in automotive applications. It supports both piezoresistive MEMS sensors and traditional strain gauge sensors. The interface provides constant voltage excitation (typically 2.5V or 3.0V) for the sensor bridge. The differential input amplifier measures the bridge output with high common-mode rejection. The device supports sensor bridge resistances from 1kΩ to 10kΩ typical.
AC7801-SENSOR works with standard resistive bridge pressure sensors. Contact LiTong for specific sensor compatibility.
How does temperature compensation work?
The AC7801-SENSOR includes an integrated temperature sensor and digital compensation engine. The device measures both pressure sensor output and temperature, then applies compensation coefficients stored in internal memory. The compensation corrects for sensor offset drift, span drift, and non-linearity over temperature. Factory calibration can be performed to optimize compensation for specific sensors. The result is accurate pressure measurement within 0.5% over the -40°C to +125°C temperature range.
Integrated temperature compensation eliminates need for external compensation components.
What is the power consumption in sleep mode?
The AC7801-SENSOR features ultra-low power sleep mode consuming only 0.5 microamps typical. In sleep mode, the ADC and signal processing circuits are powered down, with only the wake-up timer and LIN interface active. The device can be configured to wake up periodically for measurements or wake up on LIN bus activity. This low power consumption is essential for battery-powered TPMS sensors requiring 5-10 year battery life.
0.5 microamp sleep mode enables multi-year battery life for TPMS applications.
Does AC7801-SENSOR support LIN protocol?
Yes, the AC7801-SENSOR includes a LIN 2.1 compliant interface for automotive network communication. The LIN interface supports data rates up to 20kbps and includes automatic baud rate detection. The device can be configured as LIN slave for periodic pressure data transmission. The LIN interface also supports diagnostic communication and configuration updates. For TPMS applications, the LIN interface connects to the vehicle's TPMS receiver module.
LIN interface simplifies integration into automotive networks for TPMS and sensor applications.
What is the measurement update rate?
The AC7801-SENSOR supports configurable measurement update rates from 1Hz to 1kHz depending on application requirements. For TPMS applications, typical update rates are 1-10Hz to balance measurement frequency with power consumption. The device can perform single-shot measurements on demand or continuous measurements at the configured rate. Higher update rates are available for dynamic pressure measurement applications such as engine control.
Configure update rate based on application dynamics and power consumption requirements.