PT6555 Datasheet, PDF (17/28 Pages) Princeton Technology Corp – LCD Driver IC

During the reset period the states of the output pins are listed in the table below.
PT6555
Output Pin
State during reset
SG1/P1 to SG4/P4
L (Note 1)
SG5 to SG39
L
COM1 to COM4
L
SG40/KS1, SG41/KS2
L (Note 1)
KS3 to KS5
X (Note 2)
KS6
H
DO
H (Note 3)
Notes:
1. These output pins are forcibly set to be used as Segment Driver Output Pins and are held at “LOW” State.
2. When power is first applied, these pins are not defines until the control bits - S0 and S1 have been completely transferred.
3. DO is an open - drain output and requires a pull-high resistor between 1KΩ to 10KΩ. It is kept at “HIGH” state during the reset period even if a key
data read operation is executed.
V1.1
17
August, 2009