MAS1641 电容变化检测与压电报警

MAS1641 是一种用于电容变化检测和压电报警的超低功耗单芯片解决方案。典型应用包括检测输液液位下降或漏水的电池供电报警系统。

它可以配置为检测电容减少或增加超过可通过外部电阻器调节的阈值。非常高的声压级 (SPL) 警报是通过基于无电感器、低 EMI 和高效 3x 电荷泵的升压解决方案实现的。输出驱动器级可以仅从 3V 低电源驱动高达 18Vpp 的间歇警报信号到压电元件。它可以在低至 2.25V 的低电源电压下运行，并且在监控电容变化时仅消耗非常低的 36uA 电流。MAS1641 采用小型 QFN-16 3x3x0.75 mm 封装。

The MAS1641 is 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.

It 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.