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TN0235 Datasheet(PDF) 3 Page - STMicroelectronics |
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TN0235 Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 9 page 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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