UR5HC418-P

DeskCoderTM UR5HC418 AT / PS/2 - Compatible Keyboard Encoder HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODERTM FAMILY DESCRIPTION The DeskCoderTM keyboard encoder functions as a versatile, low-power desktop keyboard encoder, while providing two bi-directional channels for communication with a BIOS-compatible system as well as any optional keyboard-compatible devices, such as a 101/102/104 desktop keyboard, OCR, barcode reader, etc. The DeskCoderTM 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 handles the scanning, debounce, and encoding of 128 keys organized on an 8 x 16 matrix. In addition to the system’s keyboard communication port, the UR5HC418 provides a fully functional keyboard input port that can be used by a standard 101/102/104 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 it were coming from a single source. The DeskCoderTM is ideal for use in low-power, low-cost and highreliability AT / PS/2 - compatible keyboard designs. Note: A version of the IC that supports the PC/XT protocol is also available. Contact Semtech for more information. FEATURES Interfaces contact switch matrix keyboards to a BIOS-compatible system Single IC desktop keyboard encoder Provides interface ...