UR5HC703-600-FG Datasheet | SEMTECH

USAR Serial Coder TM UR5HC703-600-FG USAR Serial Coder TM Low-Power Keyboard Encoder interfaces RS-232 Description The USAR Serial Coder TM 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 plicated keyboard protocols are not required and where asynchronous serial interface hardware is available. The USAR Serial Coder TM 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-Power TM operation, transparent to the host. Power consumption is reduced to just the circuit’s leakage when all keys are released. The average current consumption is less than 1µA at room temperature and 10µA at 85°C. If a single key or groups of keys are stuck in the depressed position, the IC 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 Serial Coder TM are available with Hardware Handshaking for the munication channel, support for extra-low-power operations of the Host, various baud rates and Full-Duplex I/O, etc. The USAR Serial Coder TM is simple to implement. It requires few external ponents and utilizes a tiny, lowprofile 32-pin LQFP package that measures 7mm x 7mm. Copyright 2000 USAR Systems, Inc. All rights reserved. DOC5-703-600-DS-102 A Semtech pany Preliminary USAR Key Coder TM family product specifications Features - 8 x 16 Matrix Encoding - 9600 Baud 8N1Serial Data Format - IC is independent of the keyboard layout - Zero-Power TM operation, transparent to the Host - Average current consumption of less than 1µA at room temperature; 10µA at 85°C - Customized versions available Applications - Built-in keyboards for HH PDAs/Organizers - Add-on accessory keyboards for Palm and H/PC Devices...