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SC84520EP Datasheet - ETC

Part Name
Description
MFG CO.
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[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 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 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

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