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ams OSRAM - Model AS8579 -Capacitive Sensor
The AS8579 is a capacitive sensor that detects the change of capacity in different applications. The capacitive sensor measures the impedance that originates between a conducting surface (metallic object) and a human being. The IC captures the current of a metal object and applies algorithms to determine the capacitive and resistive information. The outcome information can be read through a SPI Interface that can be also used for IC configuration. This high precision performance sensor also supports a multitude of diagnostic features that meet standard functional safety requirements. The capacitive sensing IC is specifically designed to function in an electro-magnetic environment (EMC) with high magnetic disturbances. This allows the sensor to distinguish in a hands-on application if the driver‘s hand is on the steering wheel or not. The AS8579 is available in an SSOP24 package and operates at a supply voltage of 5V.
Features
- I/Q-Signal demodulation
- Up to 10 independent measurement lines possible (10 SEN lines)
- VAR&FIX_SEN function to avoid parasitic influences from cable and PCB
- Designed according functional safety standard
- AEC-Q100 Grade 1 qualified
Benefits
- Accurate capacitive measurement (seperation of resistive and capacitive information)
- Higher durability and lower system costs
- Enabler for safety critical applications
- Suitable for automotive applications
Product parameters
- System Sensitivity [fF/LSB] : 80
- Output Resolution [Bit (accumulated)] : 14
- Sensing Channels [Independent SEN lines] : 10
- Interface : SPI
- Diagnostics : YES
- Supply Voltage [V] : 5
- Temperature Range [°C] : -40 to 125
- Package : SSOP24
- Automotive Qualified [AEC -Q100] : Yes
- External Shielding Available [For cable and PCB] : Yes
- Longevity Program : January 2031
This product suits for the following applications:
- Autonomous driving applications e.g.: Hands on steering wheel detection
- Detection of any human presence exterior of vehicles e.g.: Automatic trunk opener (trunk opens automatically and touch-less by detection of human foot near the sensor only)
- Fluid Level Measurement