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A 15-nW per Sensor Interference-Immune Readout IC for Capacitive Touch Sensors
一款用于电容式触摸传感器的15nW/传感器抗干扰读出IC，采用异步CDC和高效跟踪算法。
38Hz扫描速率下每传感器15nW功耗
电容式触摸传感器低功耗读出IC异步CDC抗干扰
▸异步电容-数字转换器(CDC)
▸高效跟踪算法降低无触摸时功耗
▸集成超低功耗松弛振荡器实现周期性触发
Abstract
This paper presents a readout IC that uses an
asynchronous capacitance-to-digital-converter (CDC) to digitize
the capacitance of a touch sensor. A power-efficient tracking
algorithm ensures that the CDC consumes negligible power
consumption in the absence of touch events. To facilitate its
use in wake-on-touch applications, the CDC can be periodically
triggered by a co-integrated ultra-low-power relaxation oscillator.
At a 38-Hz scan rate, the readout IC consumes 15 nW per touch
sensor, which is