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TN0235 Datasheet(PDF) 3 Page - STMicroelectronics

Part # TN0235
Description  This document contains a list of frequently
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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TN0235
FAAQs and answers
Doc ID 17218 Rev 1
3/9
2
FAAQs and answers
2.1
How does human detection work?
The human detection is made using a well-known and proven technology called “capacitive
charge transfer”. It is based on the fact that the human body acts as a conductive object.
Basically, small changes in the capacitance of an electrode, which is affected by human
presence, are measured. The electrode is usually made of a copper plate behind a
dielectric.
To measure changes in the electrode capacitance, the STM8T141 device employs bursts of
charge transfer cycles. Consequently, charges accumulated into the electrode capacitance
are transferred to a sampling capacitor. This operation is repeated N times until the voltage
on the sampling capacitor reaches a given threshold. The number, N, of transfer cycles
required to reach the threshold represents the size of the electrode capacitance. N varies
when the electrode is touched.
2.2
What are the targeted applications?
The STM8T141 opens up a range of new opportunities and a wide number of application
domains still need to be explored.
The power supply (2 V to 5.5 V) of the product and its extremely compact package size
(either UFDFPN8 2 x 3 mm or SO8 narrow) benefits battery powered systems for integration
in miniature environments.
The device is suitable for the following functions:
On/off switch or activation button.
Wake-up function on user touch for power critical equipment and long battery lifetime.
Backlight control on proximity detection.
Below, are listed several application examples:
Elimination of mechanical buttons or on/off switches in high volume applications such
as DVD/CD drives, computers, and coffee machines to enhance system reliability.
Home button in GPS systems for easy and safe navigation in the application menu.
Light activation switches on user touch and backlight on user proximity of wall switch
outlets.
A simple button to control power, audio line or volume adjustment in Bluetooth
headsets.
User ear or head detection in MP3 headphones to automatically play/stop music. The
electrode is placed in the earpiece for nearby detection.
Cost-effective solutions to replace Infrared proximity sensors in mobile phones for ear-
face detection.
User approach detection to wake-up wireless mice or keyboards.
LCD TV front panel backlight control on hand detection.


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