Siemens S65 - LS020 Display MAximum SPI Speed

Guest #1252386
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Hi,

I'm using this display with a LPC2148 ARM7 CPU. Documents on the net 
says S65 mobile phone drives this display at 13MHz SPI clock speed but 
if I use speed about 3.75MHz it does not work.

Is there anyone has used display before at faster speeds?

I've no series resistors between MCU and LCD. MCU works @ 3.3V.

I did not connect 1.8V input of the LCD to anywhere. It is floating 
because I saw some documents say it is not functioning for LS020.

I connected 2.9V input to 3.3V supply.

And my cable is around 10" ( 25cm ) long. Is is a problem?


Regards
Guest #1252440
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Hi,

I've run the LCD at 4MHz without trouble, even with 3k3-Resistors in the 
clock and data wires. But my system runs at 3V and all the display 
supply pins (including 1V8) are connected to this voltage.

Philipp
Guest #1252536
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> And my cable is around 10" ( 25cm ) long. Is is a problem?

Yes!
Probably not with about 3 MHz, but definitely with >10MHz.

The display should work with 12 MHz because in the original mobile 
application, it runs at about 12.5 MHz.

Joachim

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