PT6552 Datasheet, PDF (13/22 Pages) Princeton Technology Corp – ½ Duty LCD Driver with On-Chip Key Input Function

PT6552
OUTPUT PIN STATES DURING THE RESET PERIOD (WHEN /RES IS
LOW)
X: don’t care
Output Pin
SG1/P1 to SG4/P4
SG5 to SG43
COM1, COM2
KS1/SG44, KS2/SG45
KS3 to KS5
KS6
DO
State During Reset
L *1
L
L
L *1
X *2
H
H *3
Notes:
*1: These output pins are forcibly set to the segment output mode and held low.
*2: Immediately following power on, these output pins are undefined until the control data S0 and S1 has been sent.
*3: Since this output pin is an open-drain output, a pull-up resistor of between 1k and 10KΩ is required. This pin is held high during the reset period
even if key data is read.
NOTE ON CONTROLLER DISPLAY DATA TRANSFER
The PT6552 transfers the display data (D1 to D90) in two operations. To assure visual display quality, all the display data
should be sent within a 30ms or shorter period.
V1.3
13
July 2010