Electronics > Beginners
Cryptic pin in datasheet (Interfacing with I2C)
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Sudo_apt-get_install_yum:
Hi all!

This is a quick question about a pin on a FFC.
I got a handful of cheap Chinese OLED's from a buddy of mine and I want to hook it up using I2C. When looking in the datasheet it gives me the info I expected (SCL, SDA and address select) but it has a forth pin "RESB" that the datasheet considers an interface pin. In the pinout table it says that RESB is " This is a reset signal input pad. When RESB is set to “L”, the settings are initialized. The reset operation is performed by the RESB signal level. "

Assuming L=Low=GND but when I hook it up to GND it doesn’t do anything. I know the code is working since it is working on the OLED modules/breakouts with the same interface and driver. I’ve hooked it up to 3V3 and nothing happened.

Not sure what’s going on here, did I fry them?  :(

Thanks for any help
tsman:
RESB just sounds like an active low reset signal. Keep it at 3.3V normally then pull it to 0V temporarily to reset the module.
bson:
What controller?  Here's the external bus pinout for the SSD1306:



I'd recommend working from the controller datasheet rather than the panel; it looks like the panel just runs the controller bus to a connector.

Oh, and if it's SSD1303 or 1306 I'd say forget I2C and use SPI instead.  These are hella flaky using I2C and will randomly lock up on you, for no apparent reason - clean signals, clock independent, etc - the interface just dies, wedging your bus and they will need to be reset.  Can't clock out of it, so it's not a lost clock.
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