K25C81

The FlexiCoderTM K25C81 is a versatile, lowpower keyboard encoder. The K25C81 offers two bi-directional channels for communicating with a PC/XT/AT/PS2 system, and/or any optional keyboard-compatible devices, such as an 83 or 101/102 standard desktop keyboard, OCR, barcode reader, etc. The K25C81 directly interfaces a PC keyboard port, making custom keyboard to system communications fully transparent.

On an 8 x 18 matrix, the FlexiCoderTM will scan, debounce and encode up to 144 keys. Scan codes corresponding to single keys of the IBM 101 keyboard, or a combination of these keys when depressed with Shift, Ctrl, and Alt keys, are generated with each key press. Custom keypad input is not effected by the Shift States of an external keyboard.

Users can conveniently define key assignments on the matrix as single or repeating actions. All keys must be released between key strokes or scanning is suspended. The encoder can buffer up to 122 keycodes, and control inputs and outputs are provided for interfacing with contact keyboards.

The FlexiCoderTM K25C81 is ideal for use with either BIOS-compatible chip sets or single-board computers for PC systems requiring a custom keyboard / keypad as an alternate or additional input device. Boards and evaluation kits are immediately obtainable and ready to connect.