INTRODUCTION
ST7571  is  a  driver  &  controller  LSI  for  4-level  gray  scale  graphic  dot-matrix  liquid  crystal  display  systems.  This  chip  is connected  directly  to  a  microprocessor ,  accepts  Serial  Peripheral  Interface  (SPI), I2C  or  8-bit  parallel  display  data  and stores in an on-chip display data RAM of 128 x 129 x 2 bits.

FEATURES
4-level (White, Light Gray , Dark Gray , Black) GrayScaleDisplay withPWM Method
Driver Output Circuits
-  128 segment outputs/ 128+1 common outputs
ApplicableDutyRatios
-  V ariouspartial display
-  Partial window moving& data scrolling
On-chipDisplayDataRAM
-  Capacity: 128 x 129 x 2= 33,024 bits
Microprocessor Interface
-  8-bitparallel interface supports
6800-series or 8080-series MCU
-  4-line serial interface(4-Line SPI)
-  3-line serial interface(3-Line 8-bit SPI)
-  I2C serial interface
On-chip LowPower  Analog Circuits
-  On-chip oscillator circuit
-  Build-in Voltage converter ( x8)
-  Voltageregulator (temperature gradient: -0.13%/°C)
-  On-chip contrast controlfunction(64 steps x 8)
-  Voltagefollower (LCD bias : 1/5to 1/12)
Operating V oltageRange
-  DigitalPower (VDD1): 1.8V~3.3V (cover 1.7V~3.4V)
-  AnalogPower (VDD2, VDD3): 2.7V~3.3V (cover 2.6V~3.4V)
Package Type
-  Application for COG