EM84520

EM84520 2-IN-ONE SCROLLING MOUSE CONTROLLER ary n i m i l e Pr 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...