PT6547 Datasheet, PDF (13/35 Pages) Princeton Technology Corp – LCD Driver IC with Key Input Function

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LCD Driver IC with Key Input Function
PT6547
COMMAND 4: DISPLAY CONTROL COMMANDS
The Display Control Commands are used to Sleep Mode control and all segment off.
When bit 1 (b0) is set to “1”, the segment display state is “ON”; When bit 1 (b0) is set to “0”, the
segment display state is “OFF”. This “OFF” state is achieved by outputting segment “OFF” waveforms
from the segment output pins.
Bit 2 to 3 (b1 to b2) are switch between Normal and Sleep Mode. Set the key states of the KS1 to KS6
key scan outputs during key scan standby.
Bit 8 (b7) is given the value of “1” while bit 7 to bit 4 (b6 to b3) is given the value of “0”. Please refer to
the diagram below.
When power is turned on, the bit 3 to bit 1 (b2 to b0) are given the value of “0”.
MSB
LSB
1 0 0 0 0 b2 b1 b0
Sleep Control setting:
Segment all OFF control setting:
0: OFF
1: ON
Control Bit
b2 b1
Mode
OSC
oscillator
Segment/Common
Output state
Output pins state during
key scan standby
KS1 KS2 KS3 KS4 KS5 KS6
0 0 Normal Operating
Operating
“H” “H” “H” “H” “H” “H”
01
“L” “L” “L” “L” “L” “H”
1 0 Sleep Stopped
“L”
“L” “L” “L” “L” “H” “H”
11
“H” “H” “H” “H” “H” “H”
*Note: Assumes that SG75/KS1 and SG76/KS2 output pins are selected for key scan output.
SLEEP MODE
Sleep mode is set up by setting b2 or b1 in the control bit to “1”. The segment and common outputs will
all go low, and the oscillator on the OSC pin will stop (it will be started by a key press). This mode could
reduce power dissipation. This mode is cleared by sending control data with both b2 and b1 set to “0”.
PT6547 V1.2
- 13 -
January, 2006