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Touch key ICs aimed at household appliances

Posted: 20 Nov 2014 ?? ?Print Version ?Bookmark and Share

Keywords:Holtek Semiconductor? household appliance? touch key?

Holtek Semiconductor has expanded its standard touch key peripheral IC series with the introduction of the BS812A-1, BS8112A-3 and BS8116A-3 devices. According to the company, the touch switch devices enable human body contact to be detected using external touch keys while internal circuitry offers automatic calibration according to environmental changes in order to improve touch detection accuracy.

The BS81xA-x series devices flaunt excellent immunity against power supply variations and a short touch switch response time, thus allowing them to be excellent touch switch solutions for various AC power product applications, Holtek stated. Additionally, the low average current characteristic of the series also makes them ideal for battery powered products.

Touch key ICs

The BS812A-1 provides two touch keys and has two corresponding output pins. With a minimum number of external components, this device can implement two touch key functions. With its 6-pin SOT23 package type having an extremely small outline, it is suitable for those application areas where space is at a premium.

The BS8112A-3 and BS8116A-3 respectively provide twelve and sixteen touch key functions. Both devices include an I2C interface that is used to transfer their key status to a host MCU. The host MCU also sends instructions over the I2C interface to instruct the devices to enter their power-saving mode and for sensitivity adjustment. A single power supply decoupling capacitor is the only external component required to implement the touch switch functions. They devices are supplied in 16-pin NSOP and 20-pin SOP/SSOP package types.

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