Green Design

Capacitive Sensor Signal Conditioner

ZMDI (Dresden, Germany) has expanded its family of capacitive sensor signal conditioners (SSCs) with the addition of the wide-dynamic-range ZSSC3122 cLite device. With new design technology, the chip delivers 14-bit resolution and 0.25% full-scale-output accuracy. A built-in sleep mode lowers current consumption to <1uA for temperatures up to 85°C, making the ZSSC3122 ideal in low-power battery applications, as well as industrial and rugged environments.

MEMS sensing elements, such as pressure sensors for hydraulic control systems, humidity sensors, and liquid level gauges also benefit from these features. The ZSSC3122 has an operating current as low as 60uA over the entire voltage range of 1.8V to 5.5V. The ZSSC3122 can be configured to interface with capacitive sensors from 2 to 10 pF with sensitivity as low as 125 atto-Farads (aF) per digital bit. The part accommodates single and differential input sensor configurations. All calibration is digital and completed in one pass, eliminating the cost of laser trimming and speeding production of fully calibrated sensor modules.