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Messages - cacio

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Graphic LCDs / Re: NHD-C12864WC-FSW-FBW-3V3 booster
« on: March 23, 2016, 03:33:35 AM »
Hallo Paul:

thank you for your prompt advise.

I did as told and put Vcc where it belongs.

Still, no success: I see no more than 2.6 V on VOUT and nothing on the LCD.

I verified with scope that the SPI clock and data are sent, as per code attached.

What should I do now?

Is it safe to place 12 V on VOUT and then keep trying to send commands till something happens?

I have been rotating some 5 units we had built, all behave the same, meaning, display does nothing except back-lights get on

Thank you again for your time and patience

Marco





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Graphic LCDs / Re: NHD-C12864WC-FSW-FBW-3V3 booster
« on: March 04, 2016, 10:10:04 AM »
Have similar problem so I post as reply:

just got started, we built right away a number of units with NHD-C12864LZ-FSW-FBW-3V3 wired as per datasheet, see picture attached (all 1 uF caps, power is 3.1 V)

Problem is that I get no display and VOUT is 2.59 V.

I verified both schematic and layout (also attached), and actual circuit matches, so what am I doing wrong?

Is it wired wrong way around?
do I have to send any specific commands to make it (VOUT to begin with) work?

I am using (trying to) SPI 3 wire and I see clock on pin 12 and data on pin 13 and A0 toggling fine on A3, have GND on 1 and 3V on 2. I put GND on 4 and 3V on 5, in case that matters.

I could put 12 V on VOUT if that does not break it.

Finally, am I missing information? I have Rev 54 (3/17/2015) of 13 pages spec sheet (www.newhavendisplay.com%2Fspecs%2FNHD-C12864LZ-FSW-FBW-3V3.pdf) and www.newhavendisplay.com/app_notes/ST7565R.pdf chip datasheet.

thank you for helping, will return code... developing on TI MSP430i2040

finally, I cannot read those letters to post, please guys...

cacio


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