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'[PIC]-Nokia 3310 LCD interfacing problems?'
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We are using the Nokia 3310 Lcd (PCD8544 - controller) in a project .
The 3310's operating voltage is 2.7V to 3.3V.
at the moment we are using a PIC16F877 (not the low voltage variant)
in conjunction with two ULN2803 drivers( to invert the signal two times ), in order to convert the signal from the
PIC to a lower voltage (3V level) required by the 3310.
We are having problems with the logic levels.
Can we connect the 3310 directly to the PIC's 5V outputs, or will the 3310
Are there other interfacing chips that we can use?
Thank you for the help.
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William Chops Westfield
On Nov 8, 2004, at 12:08 AM, Odendaal Morne wrote:
> at the moment we are using a PIC16F877 (not the low voltage variant)
> in conjunction with two ULN2803 drivers( to invert the signal two
> times ),
> in order to convert the signal from the PIC to a lower voltage (3V
> required by the 3310.
The ULN2803 is a high current darlington driver. It doesn't source
and the darlington has a significant voltage drop (though perhaps not
low current levels needed to drive signals lines.) It doesn't seem
to me that you'd be having problems using them as level converters.
Many low-voltage capable logic families are tolerant of 5V at their
and could potentially be used as level translators. TI's "Selecting
Level Translation Solution" (
"Devices from the AUC, LVC, LV-A, and AHC families have
Odendaal Morne wrote :
> We are using the Nokia 3310 Lcd (PCD8544 - controller) in a project .
Here is a page that uses a similar controller (PCF8558) :
A lot of the stuff about supply voltages might not apply,
but the 5V -> 3V interfaces could be general in nature.
It's just a voltage divider using two resistors.
3V -> 5V interfacing needs a bit more, but you
didn't mentioned that you had to do that anyway...
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