UR5HCFJ8

The LapCoderTM is a versatile, lowpower keyboard encoder for portable systems. The UR5HCFJ8 provides two bi-directional channels for communication with a BIOScompatible system as well as any optional keyboard-compatible devices, such as a 101/102 desktop keyboard.

The UR5HCFJ8 fully supports the IBM standard keyboard communication protocol; each key press generates one of the scan codes designated in the IBM Technical Reference Manuals. The keyboard encoder UR5HCFJ8 handles the scanning, debounce, and encoding of 82 keys organized on an 8x16 matrix and supports embedded numeric keypad functions as well as alternate scan codes for specific keys, so that a keyboard with only 82 keys is able to emulate the functionality of a 101/102 keyboard.

In addition to the system's keyboard communication port the UR5HCFJ8 provides a fully functional keyboard input port that can be used by a standard 82/101/102 keyboard or another 8042-compatible device, such as an external numeric keypad, an OCR, or a bar-code reader. Input from both the matrix and the external device is multiplexed and presented to the system as if UR5HCFJ8 were coming from a single source.

The features of UR5HCFJ8 make it ideal for use in PC/AT/PS/2 laptop/notebook designs that utilize the Fujitsu FKB7211 low-profile, fulltravel membrane keyboard.