LCD implementation

AYACHE laila

Hi,

My question is about this 2 figures, I didn't understand how the DISP is not used and in the diagram is connected to REGG33?

Best regards,

Laila

over 11 years ago

0 AYACHE laila over 11 years ago

Prodigy 195 points

0 Doug Williams4811 over 11 years ago in reply to AYACHE laila

TI__Expert 6470 points

Laila,

Sorry that the documentation is not clear on this point.The LCD is activated all the time during operation except shutdown. Therefore the picture above is fundamentally wrong because it shows a display push button that won't do anything in LCD mode. You can leave that pin not connected, or pull up to 3.3V if you prefer.

Thank you for pointing this out!

Regards,

Doug

0 AYACHE laila over 11 years ago in reply to Doug Williams4811

Prodigy 195 points

Doug,

thank you for your answer.

you told me that I can leave that pin (REG33) not connected, but in data sheet I find that it must be connected at last a 2.2µF capacitor to REG33 and VSS?

Regards,

Laila,

0 Doug Williams4811 over 11 years ago in reply to AYACHE laila

TI__Expert 6470 points

No, I said you can leave the DISP (aka DSPL) pin open. The REG33 pin must have the capacitor.

Power management

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LCD implementation