A circuit and method for saving power consumption of a touch chip

Abstract

This invention discloses a circuit for saving power consumption of a touch chip, comprising: a high-frequency clock generation circuit for providing a high-frequency clock signal; a sleep control circuit for controlling the high-frequency clock generation circuit to turn on or off periodically; a touch scanning circuit connected to the touchscreen of an external device, wherein the touch scanning circuit automatically scans the touchscreen and acquires touch data after the sleep control circuit periodically turns on the high-frequency clock generation circuit; a wake-up processing circuit; and a scan data processing circuit for processing the scan data acquired by the touch scanning circuit, calculating the difference between the processed data and a preset base value, comparing the difference with a preset threshold, and using the comparison result to reflect whether there is a touch action. If there is a touch action, the wake-up processing circuit wakes up the preset touch chip CPU. This invention can reduce the power consumption of the touch chip in standby mode and reduce the overall power consumption of the touch chip.

Images