Digital Capacitive Plus Bridge Sensor Interfaces

Overview

The MVCBT015 is a programmable, highly accurate, capacitance-to-digital converter and bridge interface that is designed to be easily integrated with capacitive and bridge 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 also includes a high-accuracy integrated temperature sensor that enables the user to compensate for temperature dependencies of the sensor elements, as needed.

Temperature Range	-40 to 125°C
Input Capacitance Range	2 to 7 pF
Temperature RMS Noise	0.01°C
Capacitance RMS Noise	0.4fF @ 1pF input range
Bridge RMS Noise	4.5µVrms @ 50mV input range
Average Current for One Meas./sec	14-Bit Capacitance: 0.5µA 14-Bit Temperature: 0.6µA 16-Bit Bridge: 1.7uA
Power Supply Voltage	1.71 to 3.6V
Ultra-low Standby Current	25nA
Output	Digital I2C and SP

Key Features

Trimmable input capacitance range, for flexibility and dynamic range optimization
Internally regulated bridge-excitation voltage
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, 10, 12, and 14-Bit for the temperature sensor and the capacitance interface
- 14, 16, 18, and 20-Bit for the bridge sensor interface
Ultra-low sleep current

Block Diagram

Applications

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

Technical Specifications

TSMC

In Production: 180nm
Silicon Proven: 180nm

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