i’m trying to connect a newhaven nhd-2.8-2.5664ucb2 display (datasheet).
to get my 2.5v, i’m using a 10r/33r resistor voltage divider. after voltage loss on the ribbon cable to the breadboard, i have 3.27v from the core. so taking voltage off the 33r resistor (i think later i’ll use a resistor/zener combination for efficiency) gives me 2.51v. perfect. that also leaves me with 76mA of current available, so there should be enough to power the display.
for wiring, i used the ssd1306 wiring diagram at ucapps. i think the pins match up enough to be fairly obvious, but my connections may be wrong.
here is how i have the display connected:
(edit: except for vdd/vss, i replaced all resistor dividers with 1k/330r)
1 VSS - lpc17 ground
2 VDD - lpc17 VDD (2.5v from 33r resistor)
3 NC - not connected
4 D/C - RS on lpc17 (2.5v from 33r resistor)
5-6 VSS - lpc17 ground
7 SCLK - E on lpc17 (2.5v from 33r resistor)
8 SDIN - RW on lpc17 (2.5v from 33r resistor)
9 NC - not connected
10-14 - lpc17 ground
15 NC - not connected
16 /RES - to VDD/2.5v via a 1K (this pin is active low)
17 /CS - D0 on lpc17 (2.5v from 33r resistor)
18 NC - not connected
19 BS1 - lpc17 ground
20 BS0 - lpc17 ground
i compiled and uploaded the sd1322 demonstration app from the repository. without the display connected, the core functions normally (led blinks a few times and i can still upload). with the display connected, the lpc17’s led blinks endlessly and i can’t upload anything. the core is locked up.
any ideas would be appreciated!
ultra