The JHM2102 is a CMOS integrated circuit for signal conditioning of ceramic capacitive pressure sensors, which is a kind of sensing element varies its capacitance as the pressure changes. The JHM2102 measures the capacitance and converts it to a voltage linearly proportional to the pressure. Compensation of sensor offset, sensitivity, non-linearity is implemented on-chip without external trimming components. The digital one-wire interface can be used for a simple calibration procedure in order to program a set of calibration coefficients into on-chip non-volatile memory. With an external reference capacitance, the JHM2102 can accommodate almost all kinds of ceramic capacitive sensing element with a pair of parallel plates. Thus, the ceramic capacitor and the JHM2102 are mated: fast and precise.

Features

? Accommodates 3-wires sensor assembly

? 32bit x 2 OTP for at most 2 times calibration

? Integrated sensor offset, sensitivity, non-linearity compensation

? Low temperature drift, very easy to achieve precision better than +/-2%FS over full temperature range

? Simple calibration process, 2 or 3 pressure points in room temperature

? Output response time ~1ms

JHM2102 Block Diagram

Applications