DESCRIPTION
PT6555 is a high performance Liquid Crystal Display (LCD) Driver IC utilizing CMOS Technology specially designed with Key Input Function. It can drive up to a maximum of 164 segments and control up to 4 general purpose output ports. It includes a Key Scan Circuit that can support up to 30 key inputs and provides On-Chip Voltage Detection Type Reset Circuit which prevents incorrect display. Display Data can be directly displayed without using any decoder. PT6555 also supports both 1/4 duty-1/2 bias and 1/4 duty-1/3 bias drive techniques. Pin assignments and application circuit are optimized for easy PCB Layout and cost saving advantages.

FEATURES
• CMOS Technology
• PT6555: 48-pin, up to 140 Segment Drivers (4 Com x 35 Seg)
• PT6555-LQ: 64-pin, up to 164 Segment Drivers (4 Com x 41 Seg)
• Up to 4 General Purpose Output Ports
• Key Input Function (Only PT6555-LQ)
• 1/4 Duty-1/2 Bias and 1/4 Duty-1/3 Bias Drive Techniques
• Sleep Mode & All Segment OFF Function
• On-Chip Voltage Detection Type Reset Circuit
• RC Oscillation Circuit
• Power supply voltage: 4.5 to 6V
• COMS/TTL compatible logic input pins
• Available in 64 pins LQFP; 48 pins LQFP Package

APPLICATIONS
• Electronic Equipment with LCD Display