PT6553_10 Datasheet, PDF (9/41 Pages) Princeton Technology Corp – LCD Driver IC with Key Input Function

LCD Driver IC with Key Input Function
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URL: http://www.princeton.com.tw
PT6553
CONTROL DATA FUNCTIONS
SLEEP CONTROL DATA BITS: S0, S1
S0 and S1 are sleep control data bits which can be switched between the normal and the sleep modes.
They are used to set the states of the KO1 to KO6 Key Scan Outputs when the key scan is in a standby
mode.
Control Data
S0 S1
0
0
0
1
1
0
1
1
Mode
OSC
Segment Outputs
Common Outputs
Normal Operating
Sleep Stopped
Sleep Stopped
Sleep Stopped
Operating
L
L
L
State of Output Pin during Key Scan
Standby Condition
KO1 KO2 KO3 KO4 KO5 KO6
H HHHH H
L LLLL H
L LLLH H
H HHHH H
Note: This is under the assumption that the KO1/SG41 and KO2/SG42 Pins are selected for Key Scan
Output.
KEY SCAN OUTPUT/SEGMENT OUTPUT SELECTION CONTROL DATA BITS: K0,
K1
K0 and K1 are control data bits which may be used for key scan output or segment output.
Control Data
K0 K1
0
0
0
1
1
x
State of Output Pins
KO1/SG41 KO2/SG42
KO1
KO2
SG41
KO2
SG41
SG42
Maximum Number of Input Keys
30
25
20
Note: x = Irrelevant
PT6553 V1.7
-9-
November, 2007