Low power capacitive sensor button

• Main Authors: MAHARYTA ANDRIY, LIEPOLD CARL, KLEIN HANS
• Format: Patent
• Language: Chinese; English
• Published: 01.03.2017
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

A capacitance sensing module includes a timer circuit configured to generate a repetitive trigger signal, a low power oscillator block configured to generate a clock signal having a higher frequency than the repetitive trigger signal, a sensing block coupled with the timer circuit and the oscillator block and configured to, in response to the repetitive trigger signal, detect a presence of a conductive object at a capacitive sensor button by applying an excitation signal based on the clock signal to the capacitive sensor button, and a wake logic block coupled with the sensing block and configured to transition a processing unit from a low power consumption state to a high power consumption state in response to the sensing block detecting the presence of the conductive object at the capacitive sensor button. 种电容感测模块，包括：定时器电路，其被配置为产生重复触发信号；低功率振荡器块，其被配置为产生具有比重复触发信号更高的频率的时钟信号；感测块，其与定时器电路和振荡器块耦合，并且被配置为响应于重复触发信号，通过将基于时钟信号的激励信号施加到电容式传感器按钮来检测在电容式传感器按钮处的导电物体的存在；以及唤醒逻辑块，其与感测块耦合并且被配置为响应于感测块检测到电容式传感器按钮处的导电物体的存在而将处理单元从低功耗