PT6552 Datasheet, PDF (6/22 Pages) Princeton Technology Corp – ½ Duty LCD Driver with On-Chip Key Input Function

PT6552
CONTROL SERIAL DATA FUNCTION
1. S0, S1: SLEEP CONTROL DATA
This control data switches the LSI between normal mode and sleep mode. It also sets the key scan output standby states
for pinsKS1 to KS6.
Control Data
S0
S1
Mode
Oscillator
Segment outputs
Common outputs
Key scan standby mode output pin states
KS1 KS2 KS3 KS4 KS5 KS6
0
0 Normal Oscillator
Operation
H
H
H
H
H
H
0
1
Sleep
Stopped
L
L
L
L
L
L
H
1
0
Sleep
Stopped
L
L
L
L
L
H
H
1
1
Sleep
Stopped
L
H
H
H
H
H
H
2.K0, K1: KEY SCAN OUTPUT/SEGMENT OUTPUT SELECTION DATA
This control data switches the KS1/SG44 and KS2/SG45 output pins between the key scan output and segment output
function.
Control data
K0
K1
Output pin states
KS1/SG44
KS2/SG45
Maximum number of key inputs
0
0
KS1
KS2
30
0
1
SG44
KS2
25
1
X
SG44
SG45
20
X: don’t care
3. P0, P1: SEGMENT OUTPUT PORT/GENERAL-PURPOSE OUTPUT PORT
SELECTION DATA
This control data switches the SG1/P1 to SG4/P4 output pins between the segment output port and the general-purpose
output port function.
Control data
Output pin states
P0
P1 SG1/P1 SG2/P2 SG3/P3 SG4/P4
0
0
SG1
SG2
SG3
SG4
0
1
P1
P2
SG3
SG4
1
0
P1
P2
P3
SG4
1
1
P1
P2
P3
P4
The table below lists the correspondence between the display data and the output pins when the general-purpose output
port function is selected.
Output pin
Corresponding display data
SG1/P1
D1
SG2/P2
D3
SG3/P3
D5
SG4/P4
D7
For example, if the output pin SG4/P4 is set for use as a general-purpose output port, the output pin SG4/P4 will output
a high level when the display data D7 is 1.
4. SC: SEGMENT ON/OFF CONTROL DATA
This control data controls the segment on/off states.
SC
Display states
0
On
1
Off
V1.3
6
July 2010