The AD7151 is an ultra-low power, single-channel capacitance converter for capacitive proximity sensors. AD7151 features fast response time and ultra-low power consumption, and can be used in applications such as proximity sensing, contactless switching, position detection, and water level detection.
The AD7151 is a complete signal processing solution for capacitive proximity sensors. It features an ultra-low power consumption of 70 pA and offers two modes of operation: standalone with fixed settings or interfaced to a microcontroller via a serial interface for user-defined configurations.
The device utilizes Analog Devices' capacitance-to-digital converter (CDC) technology, providing high input sensitivity and tolerance for parasitic ground capacitance. It includes an integrated adaptive threshold algorithm that compensates for variations in sensor capacitance caused by environmental factors such as humidity and temperature.
| Supply Voltage Range | 2.7 V to 3.6 V |
|---|---|
| Operating Temperature Range | -40°C to +85°C |
| Conversion Time | 10 ms |
| Input Capacitance Range (Max) | 4 pF |
| Resolution (for 4 pF range) | 2.0 fF |
It features an integrated adaptive threshold algorithm that compensates for variations due to humidity, temperature, or dielectric material changes.
Yes, it can be interfaced to a microcontroller via a 2-wire serial interface (I²C compatible) for user-defined settings.