AN2967 Datasheet, PDF (1/9 Pages) STMicroelectronics – Implementing a driven shield on STM8T and STM8TS capacitive sensors

AN2967
Application note
Implementing a driven shield
on STM8T and STM8TS capacitive sensors
Introduction
The STM8T and STM8TS capacitive sensors opens up a new dimension to capacitive
sensing by detecting user’s proximity up to 30 cm. This is a key feature for many end-
applications such as personal navigation devices (PNDs) or stove tops which are equipped
with backlighting that switches on when a user is detected. Proximity detectors are also
implemented in white goods, automotive devices, palm tops, and on any type of kitchen or
office appliance where the display needs to be turned on to allow some parameters to be
adjusted by the user.
To enhance their application appearance and ease-of-use, designers can choose to add
proximity detection as an extra feature. The alternative is to implement it to save energy,
allowing the product to remain in sleep mode and only wake up when it detects a user in its
proximity.
May 2009
Doc ID 15601 Rev 1
1/9
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