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PT6553

LCD Driver IC with Key Input Function

Princeton Technology 

LCD Driver IC with Key Input Function

Tel: 886-2-66296288

Fax: 886-2-29174598

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

PT6553

SLEEP MODE FUNCTION

The Sleep Mode is activated by setting S0 or S1 to "1". Both the segment and common outputs will be

"LOW" and oscillation operation will stop reducing the power dissipation. However, oscillation

operation will be activated again when a key is pressed. The Sleep Mode is deactivated when both S0

and S1 bits are set to "0". It should be noted that even in the Sleep Mode, the SG1/P1 to SG4/P4 pins

can also be used as General Purpose Output Ports depending on the states of the P0 and P1 control

data bits. Please refer to the control data section for details.

KEY SCAN OPERATION

KEY SCAN TIMING

The key scan period is 288T (s). The key is scanned twice and when the key data is in agreement with

the key that has been pressed, then the key operation is valid. The key data read request (DO is set to

"LOW") is outputted after starting a key scan operation. If the key data is not in agreement with the key

that has been pressed, the PT6553 scans the key again. PT6553 can only detect a key press longer

than or equal to 615T (s). Please refer to the diagram below.

KO1

KO2

KO3

KO4

KO5

*1

*

2

*

3

*

4

*

5

1

*

2

*

3

*

4

*

5

*

KO6

6

6

576T (s)

KEY ON

Note:

* = During the Sleep Mode Condition, the States ("HIGH" or "LOW") of these pins are determined by

the control data bits -- S0 and S1 bits. When these pins are set to "LOW" State the key scan output

signals are not outputted.

PT6553 V1.7

- 15 -

November, 2007

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