Touch Controllers Suit Portable Applications

Integrated Device Technology (IDT) has announced the newest members of the IDT Puretouch family of capacitive touch devices, targeting low-channel consumer, white goods and portable devices. The Puretouch technology can be implemented through button, slider and scroll options. By incorporating lower power consumption as well as features including advanced proximity sense capability and power-on touch detection, the latest controllers help designers improve system design for those devices requiring eight buttons or less.

Offering increased functionality for IDT customers, the LDS6200 family is capable of detecting up to eight simultaneous touches and includes built-in proximity sensing, which allows activation of features such as backlighting and wake up prior to the actual touch contact. IDT has also incorporated power-on touch detection into this family to solve the problem of end devices not recognising existing touches during power-on. This feature allows the end application to recognise touch events already present at power-on, a critical capability enabling many consumer devices to enter diagnostic modes.

Building on other members of the Puretouch family, the LDS6200 series follows the IDT Power Smart initiative and is further optimised for ultra-low power consumption. The family enables power-efficient continuous scan of buttons without sleep modes, making the LDS6200 an ideal solution for battery driven portable applications. In continuous scan mode, the LDS6200 consumes 100uW, which is 20 per cent lower than the current product family.

With wide voltage range support (1.8V to 5.5VDC), no external voltage converter is required for non-portable applications. The IDT LDS6200 family of devices offers support for I2C - the most common interface for applications ranging from white goods to mobile devices. Furthermore, the new members of the Puretouch family help IDT customers speed time to market through their simplified system design and easy implementation, which is achieved through the optimised touch controller architecture, alleviating the need for complex firmware development.

The devices are available in a variety of package options, including 16-pin and 20-pin TQFN and SSOP packages. Evaluation and development kits are available for testing, analysis and system emulation. Each kit consists of an evaluation tuning board, sample sensor board and a software interface for optimising Puretouch controller configuration with a customer's sensor board.

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