atomdtu2-NB-IOT sim7028 not working

[daniyyel]

have 2 of this, tried it with atom-lite, and atom-lite-s3
and in both cases the sim7028 is not responding, and neither turnn on the power led.

[felmue]

Hello @daniyyel

I guess you already read the official documentation here?

What have you tried so far? How do you power it? Could you share some code?

Thanks
Felix

[daniyyel]

the atompdu2-nb-iot is v1.1 has an io_exp to manage the power/reset of the sim7028, but so far all I found out that
it's an M5IOE1, at 0x6f, but no idea how to continue.

[felmue]

Hello @daniyyel

ah, ok. So the correct documentation is here.

Have a look at the code examples in Quick Start Guide to see how the M5IOE1 needs to be programmed to turn on power etc.

The function is called SIM7028_EN() and first turns on power then resets the modem.

Thanks
Felix