UR5HC418-FN Datasheet | SEMTECH

Desk Coder TM UR5HC418 AT / PS/2 - patible Keyboard Encoder HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODERTM FAMILY DESCRIPTION The Desk Coder TM keyboard encoder functions as a versatile, low-power desktop keyboard encoder, while providing two bi-directional channels for munication with a BIOS-patible system as well as any optional keyboard-patible devices, such as a 101/102/104 desktop keyboard, OCR, barcode reader, etc. The Desk Coder TM fully supports the IBM standard keyboard munication 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 munication port, the UR5HC418 provides a fully functional keyboard input port that can be used by a standard 101/102/104 keyboard or another 8042-patible 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 ing from a single source. The Desk Coder TM is ideal for use in low-power, low-cost and highreliability AT / PS/2 - patible 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-patible system - Single IC desktop keyboard encoder - Provides interface for an external keyboard/keypad or other 8042patible devices - AT / PS/2 - patible APPLICATIONS - Desktop puters - Instrumentation - Industrial keyboards PIN ASSIGNMENTS - Point of sales terminals - Public information kiosks - Implements all functions of a 101/102/104 keyboard - Low-power HCMOS microcontroller, suitable for 3-volt battery-operated systems - Available in DIP, PLCC and QFP packages - Custom versions available in small or large quantities 6 RP KD KC EKC EKD CL C0 C1 C2...