PT6554_10 Datasheet, PDF (8/30 Pages) Princeton Technology Corp – LCD Driver IC

PT6554
FUNCTION DESCRIPTION
CONTROL DATA BITS
SLEEP CONTROL BITS: S0, S1
S0 and S1 are control bits used to select either the Normal or Sleep Mode as well as set the state of the key scan output
pins, namely: KS1 to KS6 during the key scan stand-by. Please refer to the table below.
Control data
S0 S1
Mode
OSC
controller
Segment outputs
Common outputs
Output pin states during key scan stand-by
KS1 KS2 KS3 KS4 KS5 KS6
0
0 Normal Operating
Operating
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
Note: This table is under the assumption that the pins – SG40/KS1 and SG41/KS2 are used as Key Scan Output Pins.
KEY SCAN OUTPUT / SEGMENT DRIVER OUTPUT SELECT BIT: K0, K1
K0 and K1 are control bits used to select the function of the pins – SG40/KS1 and SG41/KS2.
These pins (SG40/KS1 and SG41/KS2) may either be used as Key Scan Output Pins or Segment Driver Output Pins.
Please refer to the following table.
Control data
K0
K1
Output pin state
SG40/KS1
SG41/KS2
Maximum number of input keys
0
0
KS1
KS2
30
0
1
SG40
KS2
25
1
X
SG40
SG41
20
Note: x = Not Relevant
SEGMENT DRIVER OUTPUT / GENERAL PURPOSE OUTPUT PORT SELECT BIT:
P0, P1
P0 and P1 are control bits used to select the function of the pins – SG1/P1 to SG4/P4. These pins (SG1/P1 to SG4/P4)
may be used either as Segment Driver Output Pins or General Purpose Output Ports. Please refer to the table below.
Control data
P0
P1
0
0
0
1
1
0
1
1
SG1/P1
SG1
P1
P1
P1
Output state
SG2/P2 SG3/P3
SG2
SG3
P2
SG3
P2
P3
P2
P3
SG4/P4
SG4
SG4
SG4
P4
When the output pins (SG1/P1 to SG4/P4) are used as General Output Ports, the correspondence between the display
data and these pins are shown in the table below.
Output pin
SG1/P1
SG2/P2
SG3/P3
SG4/P4
Corresponding display data
D1
D5
D9
D13
To further clarify the table above, the following example is given. If the output pin – SG1/P1 is used as a General Output
Port, then SG1/P1 Pin will output a “HIGH” Level if the corresponding Display Data,
D1 – is set to “1”. Likewise, if the output pin – SG4/P4 is used as a General Output Port, then the SG4/P4 Pin will output
“HIGH” Level, if the corresponding Display Data, D13 – is set to “1”.
V1.4
8
June 2010