PT6553 Datasheet, PDF (5/7 Pages) Princeton Technology Corp – LCD Driver IC with Key Input Function

Princeton Technology Corp.
LCD Driver IC with Key Input Function
Tel : [phone]
Fax: [phone]
URL: http://www.princeton.com.tw
PT6553
APPLICATION CIRCUIT 3
1/3 Bias (For Normal Panel Use)
+5V
C > 0.047uF
(See Note 1)
OSC
VDD
TEST
VSS
VDD1
VDD2
CE
FROM
CLK
CONTROLLER
DI
DO
TO CONTROLLER
TO CONTROLLER
POWER SUPPLY
(See Note 2)
COM1
COM2
COM3
P1/SG1
P1/SG2
P3/SG3
P4/SG4
SG5
SG40
P1
P2
P3
P4
GENERAL PURPOSE
OUTPUT PORTS USED
WITH THE BACK-
LIGHT CONTROLLER
OR OTHER CIRCUITS
LCD
PANEL
(UP TO 126
SEGMENTS)
SG41
SG42
KEY MATRIX
(UP TO 30 KEYS)
Notes :1. Connect a capacitor to the power supply line so that the when the PT6553 is reset by the
VDET, the power supply VDD rise time when power is applied and the power supply voltage
VDD fall time when power drops are both at least 1 ms.
2. Since the DO Pin is an open drain output, it needs a pull-up resistor (1 to 10 k Ohms) which is
appropriate for the capacitance of the external wiring so that the waveforms are not degraded.
PT6553 v 1.0
5
Updated November 2000