LCD Backlight
I got this SDT032TFT-TS LCD and looking at the data sheet ( http://mouser.com/catalog/specsheets/sdt032tft-v30.pdf ) I see pin 1 is the backlight LED Anode, and pin 2 is the backlight LED Cathode.
Also in the data sheet in the backlight section they mention forward voltage of 14.5-17 volts. I am not sure what is this forward voltage. Is it generated automatically or do I have to provide it?
Now I just want to turn on the backlight, so what do I do? do I connect pin 1 to 2.8 volts or 15 volts?
I know that of course pin 2 is ground.
Thanks.
There are 4 LED chips and they are wired in series, so the required input voltage is not the typical 3.2V, but the current is really low – 15mA. Supply 14.5~17V is correct for the backlight. Please reference the pinout for the anode and cathode connections.
Please let us know if you have any additional questions or concerns.
On your previous post is there 4 or 5 LED's on the backlight because when I looked at the datasheet it shows that there are 5. Is there a Step-Up converter that you know of that the input voltage is 3.2Volts? The only one that I saw was the LT1937 but it requires 5Volts for 5 LED's. That's why I want to clarify if it's 4 or 5 LED's.
There are 5 (five) LED's, please see page 10 of the spec for verification. For a step up converter I'd check with companies such as Microchip, Cypress Semi, Maxim, National Semi, etc. to see which offers the the best solution for you.
