PT6547 Datasheet, PDF (7/35 Pages) Princeton Technology Corp – LCD Driver IC with Key Input Function

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LCD Driver IC with Key Input Function
PT6547
FUNCTION DESCRIPTION
COMMANDS
Commands determine the display mode and status of PT6547. A command is the first byte (b0 to b7)
inputted to PT6547 via the DIN pin after STB pin has changed from “High” to “Low” State. If for some
reason the STB Pin is set to “High” while data or commands are being transmitted, the serial
communication is initialized, and the data/commands being transmitted are considered invalid.
COMMAND 1: DISPLAY MODE/OUTPUT-1 STATE SETTING
COMMANDS
PT6547 provides 8 display mode settings as shown in the diagram below: As stated earlier a command
is the first one byte (b0 to b7) transmitted to PT6547 via the DIN pin when STB is “Low”. However, for
these commands, bits 7 & 8 (b6 to b7) are given a value of “0”.
The Display Mode Setting Commands determine the number, the bits 1 and 2 (b0 and b1) of duty drive
and bias drive to be used (1/3 to 1/4 duty – 1/2 bias and 1/3 to 1/4 duty – 1/3 bias), the bits 3 to 6 (b2 to
b5) are control which may be used for segment output port or general purpose output port.
When Power is turned on, the bit 6 to bit 1 (b5 to b0) are given the value of “0”.
MSB
0
LSB
0 b5 b4 b3 b2 b1 b0
Duty drive selection setting:
0: 1/4 duty drive, SG74/COM4 output pin state is COM4
1: 1/3 duty drive, SG74/COM4 output pin state is SG74
Bias drive selection setting:
0: 1/3 bias drive
1: 1/2 bias drive
Segment/General Purpose selection setting:
Control Bit
b5 b4 b3 b2
0000
0001
0010
0011
0100
0101
0110
0111
1000
SG1/P1
SG1
P1
P1
P1
P1
P1
P1
P1
P1
SG2/P2
SG2
SG2
P2
P2
P2
P2
P2
P2
P2
SG3/P3
SG3
SG3
SG3
P3
P3
P3
P3
P3
P3
Output pin State
SG4/P4 SG5/P5
SG4
SG5
SG4
SG5
SG4
SG5
SG4
SG5
P4
SG5
P4
P5
P4
P5
P4
P5
P4
P5
SG6/P6
SG6
SG6
SG6
SG6
SG6
SG6
P6
P6
P6
SG7/P7
SG7
SG7
SG7
SG7
SG7
SG7
SG7
P7
P7
SG8/P8
SG8
SG8
SG8
SG8
SG8
SG8
SG8
SG8
P8
PT6547 V1.2
-7-
January, 2006