GENERAL DESCRIPTION

The ST7533 is a single-chip dot matrix LCD drivers that can be connected directly to a microprocessor bus. 8-bit parallel or serial display data sent from the microprocessor is stored in the internal display data RAM and the chip generates a LCD drive signal independent of the microprocessor. Because the chips in the ST7533 contain 33x96 bits of display data RAM and there is a 1-to-1 correspondence between the LCD panel pixels and the internal RAM bits, these chips enable displays with a high degree of freedom.

FEATURES

• Direct display of RAM data through the display data RAM.

• RAM capacity : 33 x 96 = 3168 bits

• Display duty selectable by select pin

   1/33 duty : 33 common x 96 segment

   1/17 duty : 17 common x 96 segment

• High-speed 8-bit MPU interface (The chip can be connected directly to the both the 80x86 series MPUs and the 68000 series MPUs)/Serial interfaces are supported.

• Abundant command functions

   Display data Read/Write, display ON/OFF, Normal/

   Reverse display mode, page address set, display start

   line set, column address set, status read, display all

   points ON/OFF, LCD bias set, electronic volume,

   read/modify/write, segment driver direction select,

   power saver, static indicator, common output status

   select, V5 voltage regulation internal resistor ratio set.

• Static drive circuit equipped internally for indicators.

   (1 system, with variable flashing speed.)

• Low-power liquid crystal display power supply circuit equipped internally.

   Booster circuit (with Boost ratios of 2X/3X/4X, where the step-up voltage reference powersupply can be input externally).

   High-accuracy voltage adjustment circuit (Thermal

   gradient –0.15%/°C ) V5 voltage regulator resistors

   equipped internally, V1 to V4 voltage divider resistors

   equipped internally, electronic volume function

   equipped internally, voltage follower.

• CR oscillator circuit equipped internally (external clock can also be input)

• Extremely low power consumption Operating power

   when the built-in power supply is used (an example)

   70uA (VDD – VSS = VDD – VSS2 =3.0 V, Quad voltage,

   V5 – VDD = – 11.0 V).

   Conditions: When displays pattern OFF and the

   normal mode is selected.

• Power supply operate on the low 1.8 voltage

   Logic power supply

   VDD – VSS = 1.8V to 3.3V (+10% Range)

   Boost reference voltage: VDD – VSS2 = 1.8V to 3.3V

   Booster maximum voltage limited

   VOUT= -13V (+10% Range)

   Liquid crystal drive power supply: VDD – V5 = 4.0V to 13.0 V

• Wide range of operating temperatures: –40 to 85°C

• CMOS process

• These chips not designed for resistance to light or resistance to radiation.