PT6552LQ PTC [Princeton Technology Corp], PT6552LQ Datasheet - Page 13

• Manufacturer Part Number: PT6552LQ
• Manufacturer: PTC [Princeton Technology Corp]

OUTPUT PIN STATES DURING THE RESET PERIOD (WHEN /RES IS
LOW)
X: don’t care
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
KS1/SG44, KS2/SG45
SG1/P1 to SG4/P4
COM1, COM2
SG5 to SG43
KS3 to KS5
Output Pin
KS6
DO
13
State During Reset
X *2
H *3
L *1
L *1
H
L
L
PT6552
July 2010