3510i LCD

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Hello

My question is:

1. Is it very simple to fry LCD?
2. Shouldn't it turn on after connecting to voltage source?

I made a program with some help. However it doesn't want to work.

Any ideas what i did wrong?

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1. Yes if you apply a voltage larger than the maximum rated. The backlight probably can withstand more abuse than the driver chip.
2. Depends on what you mean by "turn on". Backlight will turn on but driver chip need to be sent a number of instructions in right order and often with proper time delays to "turn on".
Do you have a scope so you can check what is sent on SDA and SCL lines?
The driver would probably respond with pulling SDA line low after receiving a byte to acknowledge that it has succesfully received that byte (ACK).

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Pin1 _Reset
Pin2 _Cs
Pin3 Gnd
Pin4 Sdata
Pin5 Sclk
Pin6 Vdigital 1.8V
Pin7 Vbooster in 2.7V
Pin8 Vlcd max.12V <---- this has to be a typo, right?

Imagecraft compiler user

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hmm, what do you mean by
Pin8 Vlcd max.12V??

I found somthing like that:

Pin1 /Reset
Pin2 /Cs
Pin3 Gnd
Pin4 SIO
Pin5 SCK
Pin6 Vdigital
Pin7 Vbooster
Pin8 Vlcd
I connected it in this way:

{              AVR                   }
          GND
           |
           *---------|1uF|----------*
           |                +3.5V   |
           |                   |    |
PD0  PD1   |   PD2  PD3   *----*    |
 |    |    |    |    |    |    |    |
P1   P2   P3   P4   P5   P6   P7   P8
{              LCD   PINS            }
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Before answering your first post I tried to find a pinout description for the LCD. What I found by googling was two different sites describing the same thing Bob listed. After searching for 10 min for a description what Vlcd does with no luck I gave up...

There are several things in your connection that look strange to me.
1. You have left Reset and Chip select (CS) floating. Normally those type of pins need at least to be hardwired to GND or Vcc. Sometimes Reset needs to be toggled also.
2. SDA and SCL need to have pull-up resistors to Vcc to make I2C work. Maybe you have them but omitted them in your drawing.
3. According to the sparse pinout descriptions I found pin6 and Pin7 need to be connected to different voltages (1.8v and 2.7v).
4. Pin8 (Vlcd) is either the backlit power or the drive voltage for pixels. Really don't understand the point of connecting a cap to it?

Here are the specs for I2C. I suggest you search deeper and maybe ask questions on dedicated LCD-forums to get a deeper knowledge what the pins need yo be connected to (and why).
BTW, just like Bob I wonder if max +12v isn't a typo.

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Quote:

Pin8 (Vlcd) is either the backlit power or the drive voltage for pixels. Really don't understand the point of connecting a cap to it?

There seems to be conflicting info on the net about this, but I have seen several projects that do connect a cap to Vlcd. It is supposedly the output of an onboard dc/dc converter. Here's one url.

http://serdisplib.sourceforge.net/ser/nokcol_15g14.html

Quote:

3. According to the sparse pinout descriptions I found pin6 and Pin7 need to be connected to different voltages (1.8v and 2.7v).

I didn't (re-)check the controller datasheet, but I recall that the allowed voltage ranges were quite large, so both could be connected to the same voltage. IIRC 3.5V was in range for both. Oscar, I assume you have the controller datasheet?

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Yes i have datasheet for EPSON driver for this LCD. I found that max input voltage for Vdig and Vboost is 4V. I never raise that level of voltage however my LCD doesn't want to work. I wonder if its my mistake or simply that china LCD is broken. I looked if there is a way to check if the LCD is OK, but with no luck.

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Did you ever have any luck with this LCD screen? I'm trying to get the LCD from a nokia 3595 functioning. I it is my understanding that the 3510i and the 3595 screens function in exactly the same way.

I have also not been able to get anything to happen on this LCD.