PT6555 Datasheet, PDF (8/28 Pages) Princeton Technology Corp – LCD Driver IC

PT6555
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
Segment outputs
controller 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
Notes:
1. This table is under the assumption that the pins - SG40/KS1 and SG41/KS2 are used as Key Scan Output Pins.
2. Only PT6555-LQ has the KS1~KS6 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
Notes:
1. X = Not Relevant
2. Only PT6555-LQ has the SG40/KS1, SG41/KS2 pins
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
Output state
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
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
Corresponding display data
SG1/P1
D1
SG2/P2
D5
SG3/P3
D9
SG4/P4
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”.
V1.1
8
August, 2009