Dual Channel Digital Capacitive Sensor Interface

Overview

The MVCT018 is a programmable and very accurate 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. The ASIC includes a high-accuracy integrated temperature sensor that enables the user to compensate for temperature dependencies of sensor elements, as needed.

Temperature Range	-40 to 125°C
Power Supply Voltage	1.71 to 3.6V
Input Capacitance Range	0.3 to 13pF
Temperature RMS Noise	0.01°C @ 14-Bit res.
Capacitance RMS Noise (1pF Input Range)	17aF @ 21-Bit res. with IIR filter turned OFF 4aF @ 21-Bit res. with IIR filter turned ON
Average Current for One Measurement/sec	15-Bit Capacitance: 0.72µA 14-Bit Temperature: 0.75µA
Ultra-low Standby Current	15nA
Outputs	Digital I2C & 3-wire/4-wire SPI interfaces

Key Features

Each channel has an independent trimmable input capacitance range, for flexibility and dynamic range optimization
On-chip processing engine for linearization and temperature compensation – provides end user with a fully calibrated output
Internal high-accuracy and low-drift temperature sensor
Programmable resolution settings (up to 21 Bits) for each mode
On-chip IIR filter for ultra low noise measurements
Programmable alarm and clipping functions
Supports 3-wire, 4-wire SPI, and I2C communication protocols

Block Diagram

Applications

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

Technical Specifications

Foundry, Node

TSMC 0.18um

Maturity

Silicon Proven

Availability

Available

TSMC

Silicon Proven: 180nm

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