STM8T143AM62T datasheet(7/65 Pages) STMICROELECTRONICS

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STM8T143

Description

The STM8T143 is a single channel, fully integrated, touch sensing capacitive sensor. It uses

a ProxSense™ charge transfer capacitive acquisition method that is capable of near range

proximity detection. The STM8T143 offers a state of the art capacitive sensing engine with

an embedded sampling capacitor and voltage regulator allowing the overall solution cost to

be reduced and improving system immunity in noisy environments. It can target a detection

range up to 20 cm thanks to the electrode parasitic capacitance compensation (EPCC)

feature. The EPCC automatically compensates ground parasitic capacitance sources (such

as ground planes, printed circuit board tacks, and large metal objects) which significantly

reduce the proximity detection range.

The application fields or typical functions with proximity features are various and include:

on/off switches, replacement/enhancement, home buttons, backlighting feature on proximity

for user interfaces, wakeup or control function on proximity, find-in-the-dark for lighting

equipment, and companion device for battery saving in portable equipment.

The device has been designed to be used in applications where proximity is required and

touch conditions can prevail for an extended period of time which may result in

uncompensated drift in conventional capacitive sensors. Therefore, a process called

DYCAL is implemented.

The STM8T143 is an ideal alternative, cost-effective, and extremely low power solution to

replace conventional infrared optical proximity sensors. Capacitive sensing technology is

not sensitive to sunlight or artificial light effects. The STM8T143 offers a much lower

consumption (12 µA range versus 100 µA range) and a small form factor (DFN8 2*3*0.65

mm). Lastly, there is no need for a clear opening on the bezel to let light pass through.

The STM8T143 is offered in 8-pin packages and features both touch and proximity sensing

outputs.

The STM8T143 touch pad can sense through almost any dielectric and thereby allows the

electronics to be contained in a sealed enclosure.

Note:

ProxSense™ is a trademark of Azoteq (Pty) Ltd.

STM8T143AM62T датащи(PDF) 7 Page - STMicroelectronics