Digital Capacitive Sensor Interface

Overview

The MVCT017 is a programmable capacitance-to-digital converter interface, designed to be easily integrated with capacitive sensors. The chip features very fast measurement times, low operating power, and very low standby currents, making it very suitable for low-power and portable applications. Also, the ASIC includes a high-accuracy temperature sensor and a DAC to convert the calibrated measurements into an analog voltage that is proportional to the supply voltage.

Temperature Range	-40 to 125°C
Power Supply Voltage	1.71 to 3.6V
Input Capacitance Range	2 to 7pF
Temperature RMS Noise	0.01°C @ 14-Bit res.
Capacitance RMS Noise @ 1pF Input Range	0.4fF @ 14-Bit res.
Average Current for One Measurement/sec	0.6µA @14-Bit Temp. & Capacitance meas.
Ultra-low Standby Current	10nA
Outputs	Digital I2C & Analog

Key Features

Trimmable input capacitance range, for flexibility and dynamic range optimization
Internal high-accuracy and low-drift temperature sensor
On-chip processing engine for linearization and temperature compensation –provides end user with a fully calibrated output
Programmable resolution settings for each measurement mode:
- 8 to 14-Bit for the temperature sensor and the capacitance interface
Update mode with programmable update rates from 5ms to 5s
Calibrated analog output features, for both the capacitance and temperature sensors
Ultra-low operating and sleep currents

Block Diagram

Applications

Pressure, Humidity, and Temperature Monitoring
Home Automation Control
HVAC / VAV
Pressure Transmitters
IoT Environmental Sensing
Level Sensing

Technical Specifications

Availability

Available

TSMC

In Production: 180nm
Silicon Proven: 180nm

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