Description
The USAR SerialCoderTM UR5HC703 is an extremely low-power, “off-the-shelf” serial keyboard encoder. Robust, tiny and flexible, the IC is a good match for any application where the use of complicated keyboard protocols are not required and where asynchronous serial interface hardware is available.
   
Features
• 8 x 16 Matrix Encoding
• 9600 Baud 8N1Serial Data Format
• IC is independent of the
    keyboard layout
• Zero-PowerTM operation,
    transparent to the Host
• Average current consumption of
    less than 1µA at room
    temperature; 10µA at 85°C
• Customized versions available
• TTL/CMOS Output-only
    Asynchronous Serial Interface
    to the Host (direct connection to
    the UART)
• Very simple serial protocol —
    Two-Byte Identification String on
    power-up; single-Byte Matrixposition for each key-press or
    key-release
• Robust algorithm for Ghost-key
    elimination
   
Applications
• Built-in keyboards for HH
    PDAs/Organizers
• Add-on accessory keyboards for
    Palm and H/PC Devices
• Portable Personal Computers
• Instrumentation
• Remote Control
• Cellular Phones