MPQ3323B default on when turn-on? how to off?

Lighting Solutions
1

Hello.

I am testing with MPQ3323B.

After powering on and activating the EN pin with MCU, I disable the EN or ChxEN register via I2C communication.

During this time, all four channels’ LEDs are ON for several hundred microseconds.

Since the initial value of the register is 1, is there any know-how to make it not work?

If the hardware Enable pin is not activated, I2C communication does not work.
After disabling the register via communication, I tried to activate the EN pin, but communication was not possible.

What am I missing?

Thank you.

2

After enabling the hardware EN pin, I reduced the communication latency and the problem seems to disappear.

I will test it more and share it with you.

3

Many apologies for the delayed response.

Glad you were able to figure out why I2C communication was not working. Having EN activated is necessary for I2C communication to work. If there are any issues, we will be watchful for any updates.