I2c device address: 0x74 (write) and 0x75 (read)
Lcd chip: Philips PCF2105 based (for first GH688 models and for all CH388)
Chip dimension: 5.6x5.5 mm
Resolution: 3x12 characters
pin1 Reset
pin2 Sclk (i2c)
pin3 Gnd
pin4 Vlogic (+2.8V to +5V )
pin5 Vlcd (-1.8V to -3V)
pin6 Sdata (i2c)
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