Steering Wheel HOD (Hand Off Detection) is a high-performance hands-off detection solution built around driving-safety design principles, using capacitive measurement based on IQ demodulation — currently the most reliable approach available. The sensing front end uses the ams AS8579, whose capacitive signal measurement technology outperforms every comparable solution on the market today, greatly simplifying product development while delivering a better price-performance experience.
Key Points
- Hands-off detection: a complete algorithm reliably and accurately identifies the real-time hands-off state
- Detection requires no additional pressure contact and is unaffected by gloves, steering wheel covers and similar coverings
- No modification to the original steering wheel is required; the existing heating coil can be used for sensing
- Core devices comply with ISO26262 ASIL-B
Recommended Devices
- S32K Series
- TJA1044
- AS8579
Core Components
- ICs: NXP, full part number available on request
- ICs: ams, full part number available on request
- ICs: MPS, full part number available on request
Applications
Primary application: steering wheel hands-off detection
Extended applications: smart tailgate, autonomous driving, child presence detection
Reference Design AS8579 DEMO board
- Up to 10 sensing channels, meeting steering wheel hands-off detection requirements
- Ultra-low quiescent current LDO, entering low-power mode when required
- CAN / UART interfaces reserved for easy debugging and testing
- Complete hardware design package and hardware design guide
- Complete software design package and software algorithm guide
Functional Block Diagram
