(1 PC) EM84520EP ELAN Micro Peripheral IC PDIP-16

GENERAL DESCRIPTION

The EM84520 Scrolling Mouse Controller is specially designed to control serial mouse or PS/2 mouse device.

This single chip can interface three key-switches and 4 X-Y photo-couples 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 sampiling rate of motion detector is up to 65KHz.

• 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-couples inputs.

• RTS debouncing circuit included.

• Photo couple test mode included.

• Low power dissipation.

• Six types Z direction input:

1. Photo couples input. (Z/1) 4. Mechanical input. (Z/1)

2. Key-switches input. 5. Photo couples input. (Z/4)

3. Voltage-sensing input. 6. Mechanical input. (Z/2)

• Package type:

EM84520AP : 16DIP, Photo couples input. (Z/1) EM84520DP: 16DIP, Mechanical input. (Z/1)

EM84520BP : 16DIP, Key-switches input. EM84520EP : 16DIP, Photo couples input. (Z/4)

EM84520CP : 16DIP, Voltage-sensing input. EM84520FP : 16DIP, Mechanical input. (Z/2)