[HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD]

DESCRIPTION

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.

There are four types Z-axis inputs used to implement scrolling mouse functionality.

FEATURES

* Using 50k? ± 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 four photo-coupled inputs

* RTS debouncing circuit include

* Photo couple test mode include

* Low power dissipation

* Six types Z direction input:

1. Photo couples input (Z/1)

2. Key-switches input

3. Voltage-sensing input

4. Mechanical input(Z/1)

5. Photo couples input (Z/4)

6. Mechanical input (Z/2)

APPLICATIONS

* Serial PnP scrolling mouse

* PS/2 scrolling mouse

* Combo PnP scrolling mouse