Newhaven Display Forum

Newhaven Products => Character LCDs => Topic started by: seilcomp on December 08, 2015, 01:51:42 AM

Title: NHD-C0220BiZ-FSW-FBW-3V3M Problem -- Doesn't power on
Post by: seilcomp on December 08, 2015, 01:51:42 AM
Dear Sir;
 
I want to use this LCD with MSP430.

I purchased 2 pices of the sample LCD and hooked up to 3.2VDC (VCC from MSP430F5528). And I hooked up the capacitors and the pull-up resistors. I only have to connect to RST, SDA, SCL to finish the connection. But I believed, though I'm a total newbie, that I'll be able to see the display will respond by lighting up the screen when I connect the power.

But until now, nothing comes on. Shall I finish connecting the remainder of the pins to see the LCD power on>?

Also, the data sheet is kind of confusing or misleading. On the drawing, it says the pin numbers are from 8 to 1 (from left to right). But on page 4, the pin order is the other way around. Which instruction should I follow?

Please help this pitiful newbie.

Suh, Sukho from Seoul, Korea
Title: Re: NHD-C0220BiZ-FSW-FBW-3V3M Problem -- Doesn't power on
Post by: Paul_B on December 08, 2015, 08:48:16 AM
Hello Sukho!

Iím sorry to hear about the trouble you are having with NHD-C0220BiZ-FSW-FBW-3V3M. Before you can really use the LCD, you must initialize and configure it. This is accomplished by sending a number of initialization instructions to the LCD.

Please see our "Example Initialization Program" listed on page 11 in the displays datasheet:

http://www.newhavendisplay.com/specs/NHD-C0220BiZ-FSW-FBW-3V3M.pdf

Next, it would be helpful to verify your wiring / pinout. Feel free to post it below.

Finally the pin connection / wiring diagram in the displays datasheet is correct. The pin numbering listed in the mechanical drawing 8 - 1 (left to right) is there to help distinguish the correct pin order.

Please following the pin description table listed on page 4 in the displays datasheet and take special note of where pin 1 is located on the physical display when wiring.

Hope this helps!






Title: Re: NHD-C0220BiZ-FSW-FBW-3V3M Problem -- Doesn't power on
Post by: seilcomp on December 09, 2015, 01:06:51 AM
Hi, Paul;

Thank you for your kind reply.

But you didn't answer my question. "Shouldn't the LCD respond by lighting up the screen, when power is connected to VDD and VSS?".

I connected the wires according to page 4. But I haven't done anything to initialize the LCD with the software yet. Nothing is happening yet. Is this expected behavior of the LCD? Are you sure that the LCD is acting normal?


I attach the picture of my hookup with MSP430F5528 EVM (I tried by the file was too large...)

The connections are like below;

RST -> VSS
SDA -> P4.1 (PM_UCB1SDA) ->  GPIO1
SCL -> P4.2 (PM_UCB1SCL) -> GPIO2
VSS -> Board voltage reference
VDD -> 3.3V of the board
VOUT -> VSS via 1uF tantalum capacitor
C1+ & CI1- connected via 1uF tantalum capacitor
10k ohm pull-up resistor connecting SDA and VDD
10k ohm pull-up resistor connecting SCL and VDD

As I told you I bought 2 pieces. I'm testing only 1 of it and the other set hasn't been removed out of the box. So, if things clear up, I'll test the other one.

I await your kind help.

Sukho
Title: Re: NHD-C0220BiZ-FSW-FBW-3V3M Problem -- Doesn't power on
Post by: Paul_B on December 09, 2015, 11:36:29 AM
Hi Sukho,

To answer your question, No you will not see any characters appear on the LCD. Before you can really use the LCD, you must initialize and configure it. This is accomplished by sending a number of initialization instructions to the LCD.

Title: Re: NHD-C0220BiZ-FSW-FBW-3V3M Problem -- Doesn't power on
Post by: Saurabh_B on December 09, 2015, 11:40:15 AM
Also the RESET pin is active LOW.

Connect that to VDD or a GPIO pin that is HIGH.
Title: Re: NHD-C0220BiZ-FSW-FBW-3V3M Problem -- Doesn't power on
Post by: seilcomp on December 10, 2015, 01:28:04 AM
Hello Paul. Thank you again.

I didn't expect to see "CHARACTORS" appear on the LCD. I know that much. What I said was it doesn't seem to "POWER ON" even when the power is applied.. Shouldn't it show me that it's not dead, at least, by way of lightening on the screen?

Cheers!
Title: Re: NHD-C0220BiZ-FSW-FBW-3V3M Problem -- Doesn't power on
Post by: Paul_B on December 10, 2015, 08:07:52 AM
Hi Sukho,

If you would like to power on the displays backlight you will need to apply 3V @30mA (Typ.) respectively to the Anode and Cathode pins.

The wiring diagram (See page 4) shows the anode A connected to power (upward facing triangle) and the cathodes are shown connected to ground (downwards facing triangles).

http://www.newhavendisplay.com/specs/NHD-C0220BiZ-FSW-FBW-3V3M.pdf