Silan SC84520
The SC84520 Scrolling Mouse Controller id specially designed to control serial mouse or PS/2 mouse device. This single chip can interface three key-switched and 4 X-Y photo-couples plus Z-axis directly plus Z-axis directly to RS-232C or 8042 controller.DESCRIPTION
There are four types Z-axis inputs used to implement scrolling mouse functionality.FEATURES
*Using 50kΩ ± 1% resistor for RC oscillation *Compatible with legacy PS/2 mouse *Compatible with Microsoft serial scrolling mouse *Compatible with Microsoft PS/2 scrolling mouse *Serial or PS/2 port auto-detect *100 bytes PnP ID code could be filled by code layer *Built-in noise immunity circuit *The sampling rate of motion detector is up to 65 kHz *Built-in three zener diodes : one in VDD to VSS, two in RTS to VDD *CMOS push-pull RXD output *Built-in current comparator for photo-couples input *Built-in three step dynamic input impedance *Three key-switches and