SIM powered in sleep

[Tron]

Hi

We want to put the processor in deep sleep, with minimal power consumption. When we measure, we see that the SIM is powered throughout the sleep period. Is this normal? Will this impact energy consumption ofthetotl solution, and how should i make sure the device is disabling the sim?

[Bjørn Kvaale]

Hi Tron,

Regarding deep sleep, I am assuming you are referring to PSM mode. Yes, this can be normal behavior. See the comments section of this blog post below. It may be that your Mobile Network Operator does not support that given PSM interval or the PSM interval is set too short. If the PSM mode is set correctly, you should see a drop in the current consumption.

What kind of current values are you measuring now? You can try running AT+CEREG=5 & then AT+CEREG? to see the given PSM interval. I would try with different PSM intervals & see which one of them works.

[Tron]

200 µA, which is way to high. When the SIM is pulsing, we see around 4mA. 

[Bjørn Kvaale]

It seems that your device may be in edrx mode & not psm mode. Try setting a psm interval of 10 minutes. That should hopefully work. Again, I would check with the CEREG command mentioned in my first comment to see if PSM mode is actually set or not.