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Key-switch controller detects multiple press/release events

Posted: 01 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:switch controller? key press? portable application?

Maxim Integrated Products has released the MAX7359 2-wire interfaced, low-EMI key-switch controller that detects multiple key press and release events on up to 64 keys.

In order to provide event detection, the device generates and stores individual key codes in a FIFO register for each press and release to allow the monitoring of multiple key-switch events. To minimize total system cost, the MAX7359 reduces the burden of software development, and integrates debounce circuitry that eliminates the need for shift registers and RC filters. A cost-effective and easy-to-use solution for detecting multiple key presses and releases, the MAX7359 is designed for smart phone keypads, gaming controls and any other portable applications that require multiple key-entry detection.

The MAX7359 also maximizes battery life by minimizing power consumption through an autosleep mode. It provides up to seven open-drain logic outputs that can be configured to drive LEDs for added flexibility. To ensure low-EMI operation, the device's key inputs are statically, not dynamically, monitored.

The MAX7359 is available in a small, 3.5mm x 3.5mm, 24-pin TQFN package and is fully specified over the -40C to +85C extended temperature range. Prices start at $1.70 (1000-up, FOB USA).

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