Capacitance-to-digital front-end for sensing works on harvested energy

AMS announced a configurable capacitive sensing front end that can optimize the design by swapping speed and resolution.

Called

, It can capture and digitize 50,000 times per second at the fastest speed, or reach 8aF resolution at the most sensitive speed.

"Configurability also allows sensor manufacturers to weigh measurement speed and power consumption. In low-power mode, it consumes only 4µA." "AMS has developed a demo board without an external power supply, in which PCap04 uses NFC The energy collected by the RF field generated by the reader works."

The chip is intended to be used with any sensing element that produces a change in capacitance. With its six capacitance measurement channels, it can measure six grounded capacitors or three floating capacitors. It also supports differential and differential grounded sensor connections.

A wise capacitor includes anything between 1pF and 100nF.

The output can be a PWM or PDM representation of the original measured capacitance, and the internal DSP can be used to process sensor measurements and send the results via I2C or SPI. DSP can run AMS open source code and user-generated code to achieve functions such as measurement linearization, temperature compensation or conversion.

There is a demo board and a software development tool for development, testing and debugging.

It comes in the form of a bare chip or QFN-24.

AMS Marketing Director Jose Vinau said: "PCap04 provides a flexible alternative for sensor manufacturers to replace other sensor front ends with fixed operating characteristics on the market today." "It has the ability to allow sensor manufacturers to fine-tune the operation of the sensor front end to meet The advantages of its specific application requirements."

Expected application measurement parameters include pressure, force, position, tilt, humidity, weight, and level.

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