Single-key capacitive touch controllers target use in portable products

摘要

Atmel has incorporated the technology of its Qtouch charge-transfer capacitive touch sensors into a series of single-key touch controllers for the portable-device market. Applications extend beyond touch keys for single-button mechanical-switch replacements to a range of body-proximity-sensing scenarios. The chips have a power consumption of less than 17 μA at 1.8V in low-power mode and a fast wake-up time. From the low-power state, when these devices detect a key touch, they temporarily switch to a 12.6-msec fast-response mode, allowing rapid detection of additional touches.