LCD Driver IC with Key Input Function

PT6553

Princeton Technology Corp.

Tel : 886-2-29162151

Fax: 886-2-29174598

URL: http://www.princeton.com.tw

PT6553 v 1.0

3

Updated November 2000

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.

SG40

CE

CLK

DI

DO

VDD1

VDD2

TEST

VSS

VDD

OSC

P1/SG1

P1/SG2

P3/SG3

P4/SG4

SG5

COM1

COM2

COM3

(See Note 1)

(See Note 2)

FROM

CONTROLLER

TO CONTROLLER

TO CONTROLLER

POWER SUPPLY

C > 0.047uF

C

+5V

LCD

PANEL

(UP TO 126

SEGMENTS)

KEY MATRIX

(UP TO 30 KEYS)

SG41

SG42

P1

P2

P3

P4

GENERAL PURPOSE

OUTPUT PORTS USED

WITH THE BACK-

LIGHT CONTROLLER

OR OTHER CIRCUITS

APPLICATION CIRCUIT 1

1/2 Bias (For Normal Panel Use)