SPI LCD display 2.2'' 128*64 COG Graphic LCD, it has 128x64 dots, STN display mode, it support SPI interface, 6 o'clock viewing angle, VDD driver voltage ST7567, 1/64 duty, wide operating temperature -20~70 degree, storage temperature: -30~+80 degree.
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ITEM
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Standard Value
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Unit
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Number Of Pixels
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128 X 64
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--
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Module Dimension
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41.00(W)X59.00(H)x5.00 (T)
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mm
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Display Mode
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STN Positive/Negative Transflective
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Viewing Display Area
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28.60(W)X 53.60(H)
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mm
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Active Display Area
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24.93(W)X 48.61(H)
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mm
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Driver Method
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1/64 Duty,1/9 Bias
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--
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Viewing Direction
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6 O’clock
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--
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LED Backlight Color
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3 LEDS White 3.0V 45mA
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--
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Interface Type
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Serial interface
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LCD Driver
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ST7567
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Operating Temperature
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-20 ~ 70
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℃
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Storage Temperature
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-30 ~ 80
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℃
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SPI LCD MLG12864J-8 Pin definition:
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PIN NO.
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SYMBOL
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PIN Description
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1
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VG
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VG is the LCD driving voltage for segment circuits at positive frame
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2
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XV0
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XV0 is the LCD driving voltage for common circuits at positive frame
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3
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V0
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V0 is the LCD driving voltage for common circuits at negative frame
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4
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VSS
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Ground
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5
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VDD
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Power supply 3.0V
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6
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D7
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Serial data input
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7
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D6
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Serial clock input
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8
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A0
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Data or command select signal input
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9
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RES
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A reset pin
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10
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CS
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Chip select signal input (active low)
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SPI LCD display MLG12864J-8 drawing:
What is SPI LCD display?
SPI LCD display means the lcd module that with SPI interface, SPI means :Serial Peripheral interface", that is its communicate via the serial interface, SPI lcd interfac is simple,duplex, synchronization communication bus, but it is low speed than MCU interface. SPI LCD display always work in master-slave mode, the SPI lcd display could be worked in one master device and several slaver devices, SPI interface have 3-wires SPI interface and 4 wires SPI interface, the SPI signal included SDO, SDI, SCL, CS pin.
SDO: serial data output
SDI: serial data input
SCL: serial clock
CS: Chip select pin
Because SPI lcd display only need 4 wires signal or 3-wires signal (one direction data), it can save the controller pins, and save the PCB space for lay-out. the CS pin is the chip select pin for SPI LCD, the SPI LCD display only on working when the CS pin enable ( high level or low level), that means the one bus could have several SPI devices.
Spi lcd display is serial communication bus, so its data is transmit in one by one, that is the reason the SCL clock is necessary, the SCL pin provide the clock pulse, then SDI, SDO transmit the data based on the clock pulse. the data output through SDO signal, the data changed on the rising edge or falling clock edge, and be read on the next rising clock edge or falling clock edge. the same to the SDI data input, after the 8 circles, then the 8 bits data transmitted completed.
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