Hey all!
I have some problems getting LP5036 led driver to work.
Mainly, the most weird thing that is happening is that LEDs are turned on, even if IC is in reset. Meaning, as soon as I apply power, all LEDs turn on and I cannot control them via I2C interface.
It looks like the OUT pins are bridged directly to GND, but that does not make much sense.
Also, I can confirm that I2C interface is working, but I observe no change on the LEDs. If I send command to turn all LEDs off, nothing happens.

The leds I'm using are these: https://si.farnell.com/dialight/598-8d20-107f/led-red-org-240mcd-625nm-0603/dp/3514747

Any help would be greatly appreciated.

Thank you!

 

Hi kb,
Assuming the LP5036 is not faulty.
How are you controlling the EN input pin?
E

 

Hi kb,
Assuming the LP5036 is not faulty.
How are you controlling the EN input pin?
E
View attachment 339688

I observed the same issue on two different boards. Perhaps PCB manufacturer has a bad batch. Will check with them.
Regarding the EN pin, I set it to low, then to high after 100ms. If I toggle it every second for example, LEDs will be constantly turned on. However,when I set EN pin low, I cannot configure it via I2C, which means the pin works as it should.