MAS1641 – Capacitance Change Detection with Piezo Alarm

By 21.2.2019No Comments

Helsinki, Finland – 21 February 2019

MAS1641 – Capacitance Change Detection with Piezo Alarm

Micro Analog Systems Oy introduces a very low power single chip solution for a capacitance change detection and a piezo alarm. Typical applications include battery powered alarm systems detecting infusion liquid level drop or water leakage.

The MAS1641 can be configured to detect either capacitance reduction or increase over a threshold which is adjustable by external resistors. A very high sound pressure level (SPL) alarm is achieved by voltage boosting solution which is based on an inductor free, low EMI and high efficiency 3x charge pump. The output driver stage can drive up to 18Vpp intermittent alarm signal to the piezo just from a low 3V supply. It can operate from a low supply voltage down to 2.25V and it draws only a very low 36uA current when monitoring capacitance change.

The MAS1641 is available in a small QFN-16 3x3x0.75 mm package. Samples are available. Price for a QFN packaged device is USD 0.70 (1 000 pcs). For further information and samples, please contact Micro Analog Systems Oy at