INTRODUCTION The ST7689 is a driver & controller LSI for 65K color graphic dot-matrix liquid crystal display systems. It generates 384 segments and 160 commons driver circuits. This chip is connected directly to a microprocessor, accepts Serial Peripheral Interface or 8-bit/16-bit parallel display data and stores in an on-chip display data RAM. It performs display data RAM read/write operation with no external operating clock to minimize power consumption. In addition, because it contains power supply circuits necessary to drive liquid crystal, it is possible to make a display system with the fewest components. FEATURES Driver Output Circuits ♦ 384 segment outputs / 160 common outputs Applicable Duty Ratios ♦ Various partial display ♦ Partial window moving & data scrolling Gray-Scale Display ♦ 4FRC & 31 PWM function circuit to display 64 gray-scale display ♦ Support 8 color mode (Idle mode) On-chip Display Data RAM ♦ Capacity: 128 x 160 x 16 = 327,680 bits Color support by Interface ♦ 256 color mode(RGB)=(332) mode ♦ 4k colors (RGB)=(444) mode ♦ 65K colors (RGB)=(565) mode ♦ 262K colors (RGB)=(666) mode (truncate) Microprocessor Interface ♦ 8/16-bit parallel bi-directional interface with 6800-series or 8080-series ♦ 3-line (9-bits) , 4-line(8-bits) serial interface On-chip Low Power Analog Circuit ♦ On-chip oscillator circuit and voltage regulator ♦ Voltage converter (x5, x6, x7, x8) with internal booster capacitors. ♦ Extremely few outsider components. (Required outsider components: 4 Capacitors) ♦ On-chip electronic contrast control function ♦ Voltage follower (LCD bias: 1/9, 1/10, 1/11, 1/12, 1/13, 1/14) Operating Voltage Range ♦ Supply Digital Voltage -> VDDI (VDD) = 1.65~3.3V ♦ Supply Analog Voltage -> VDDA (VDD1, VDD2, VDD3, VDD4, VDD5) = 2.4~3.3V ♦ LCD driving voltage (VOP = V0 - VSS): Max: 18V LCD Driving Voltage (PROM) ♦ Contrast Adjustment Value is stored in the built-in PROM (Programmable ROM) for better display quality LCD Driving Setting Suggestion ♦ Vop=15~16V. Bias=1/9~1/11 Package Type ♦ Application for COG
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