UR5HC703

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.

The USAR SerialCoderTM UR5HC703 provides unprecedented power consumption minimization, making it ideal for use in add-on keyboards for handheld and cellular / web phones and single-board systems designed for portable applications. The IC provides Zero-PowerTM operation, transparent to the host.

UR5HC703 Power consumption is reduced to just the circuit's leakage when all keys are released. The average current consumption is less than 1A at room temperature and 10A at 85°C. If a single key or groups of keys are stuck in the depressed position, the IC UR5HC703 will enter a total shutdown after a 10-minute wait - to protect against unintended and unnecessary discharge of the batteries in the Host.

Custom versions of the USAR SerialCoderTM UR5HC703 are available with Hardware Handshaking for the Communication channel, support for extra-low-power operations of the Host, various baud rates and Full-Duplex I/O, etc. The USAR SerialCoderTM UR5HC703 is simple to implement. It requires few external components and utilizes a tiny, lowprofile 32-pin LQFP package that measures 7mm x 7mm.