Digital Capacitive Sensing Chip - MC12G

MC12G and MC12T are highly integrated dual-channel capacitive sensing chips. They measure single-ended capacitance to ground, directly connected to the capacitor plates, and use very high frequency resonant excitation to measure tiny capacitance changes. The excitation frequency is configurable from 10 to 100MHz, and the frequency measurement output is a 16-bit digital signal, corresponding to a capacitance resolution as high as 0.5fF. The chip features a fully digital design, supporting I2C communication up to 1MHz for configuration and data read/write. It also integrates a low-noise power management module (LDO) to accommodate a wide input voltage range. Additionally, the chip includes temperature sensing circuitry for temperature compensation and other temperature sensing applications.

Capacitive sensing, combined with detection electrodes, enables dielectric detection of different materials. It is a low-power, low-cost, and high-resolution non-contact detection technology. Compared to traditional RC oscillator-based touch capacitance structures, MC12G and MC12T use a very high frequency LC resonance method, providing better electric field penetration. The chip's frequency calculation is fully digitalized through an internal digital signal processing unit, and multiple operating modes can be flexibly configured. MC12T features a compact SOP8 pinout for low-cost dual-channel capacitance detection. MC12G comes in a small QFN16 package, offering more comprehensive internal control.

I. Features of Digital Capacitive Sensing Chip - MC12G:

Capacitance Measurement Range: 0~150pF
Temperature Range: -55°C~+125°C
Frequency Range: 10MHz~100MHz
Effective Resolution: Up to 15bit
Supply Voltage Range: 2.0V~5.5V
Conversion Time: 1~100ms (configurable)
Measurement Peak Current: 1.3~8.3mA (configurable)
Sleep Mode Current: 50nA
Shutdown Mode Current: 40nA

II. Applications of Digital Capacitive Sensing Chip - MC12G: