General Description: 
	TT1620 is a LED Controller driver. Eight segment output lines, Six grid output lines, display 
	memory, pulse width control circuit, 3 wire interface circuit are all incorporated into a single chip 
	to build a highly reliable peripheral device for a single chip microcomputer. 
	Features:
	 Display Mode:8 segment X 6 Grid 
	 8 step Dimming adjustment 
	 Build-in RC oscillator 
	 Serial interface for clock, data Input/ output, strobe pins 
	 CMOS technology 
	 Low power consumption 
	 SOP20 package (TT1620) 
	.Pin Assignment: