SF sells the data connector for the PSP LCD but not the connectors for the power and touch screen.
Anyone knows a reference for the appropriate connectors from Digikey or similar sources?
Thanks
The backlight and touch screen are 4-pin connectors of the “fpc” type like the main ribbon cable connector.
The backlight is apparently .5mm pitch just like the main connector… I have here part # XF2L-0425-1A from digi-key.
The touch screen is 1mm pitch. But instead of getting a connector from digi-key, I just ordered an FPC to 4 wires breakout cable from circuit-ed.com because I’m not sure yet what I’m going to do for the touch screen interface, but it definitely won’t be on the same header as the rest of my LCD interface.
While we’re on the topic, the datasheet for this LCD is not terribly clear on the power-up sequence. After powering up the first voltage (I believe the logic supply) how long before powering on the analog supply? Does it matter in particular, as long as the first voltage is all the way up when the next gets powered up?
Regarding the power supply sequencing, make sure you follow the exact order in the DS, IIRC, there was a minimum hold time as well, at least there was from analog on to disp assertion; otherwise the display just powers up to garbage, or does all sorts of weird things.
Cheers,
–David Carne
Thanks. To be safe I guess I’ll go with a few ms from digital on to analog on.
I’m actually going to use a power supply for the LCD breakout board, then steal power from it to power my FPGA board, and I can have my FPGA wait that amount of time before it ever starts doing anything, or just not plug in the FPGA power until after the screen is powered up.
By the way, we put some current (with a series resistor) through the backlight to see if it would work , and it did draw current, but we didn’t see anything since the screen is black. Not even any light leakage through the edges. Is that normal? This means we won’t see anything of the backlight until the whole thing is running?
One more question… on the backlight connector, is pin 1 the pin that is leftmost when looking at the side of the ribbon that has the contacts?
This is what I assume, but I’d like to be sure, and I guess you’d know that, and I’d like to know for sure…
Thanks,
Steve