Ericsson T20 / T28 / T29 LCD Pins


pin1 Vlcd (+6.4V)
pin2 Vlogic (+2.7V)
pin3 Sdata (i2c)
pin4 Gnd
pin5 Sclk (i2c)


I2c device address: 0x70h, 0x71h

Lcd chip: based on PCF8558

Instruction: control byte, address

Instruction	DB7	DB6	DB5	DB4	DB3	DB2	DB1	DB0	Description
Display control	Y2	Y1	Y0	0	0	0	0	0	Y address vector, blank mode
				0	1	0	0	1	normal mode
				0	1	1	0	1	all segments on mode
X address	0	X address							set column address

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