nrf9160 hardware

[Mac-fang]

嗨，

 我正在测试NRF9160，但找不到SIM卡。而且我发现SIM_1V8的引脚为低。我怎样才能打开它？它由3V3供电。

[Amanda Hsieh]

Hi, 

Do you mean the board cannot detect the SIM card and the SIM_1V8 pin is low? Are you using nRF91 DK or the custom board? 

Are you able to get 1.8 volt in the sim slot?

Could you test with the at_client sample (or Testing a prebuilt application for DK), and check what AT%XSIM? returns?

Do you get any errors code?

Also, check that the SIM-card is inserted correctly in the SIM socket. Some sockets allow the SIM-card to be inserted 2 different ways, but only one way works. And then you need to take the SIM-card out, turn it 180 degrees, and put it back in the socket again. 

nRF9160 DK Getting Started might help. 

-Amanda H.

[Mac-fang]

Hi ,

   yes. Thanks for your reply.  it's custom board .  But i don't have  nRF9160-DK,so i can't test with it now.

   i have another question, is there a pin used for controling the output of SIM_1V8 .Actually some 4G modules have this pin . And there are two buttons in DK for nRF9160 , what are they used for ? 

[Amanda Hsieh]

Hi, 

Are you able to get 1.8 volt in the sim slot?

Mac-fang said:

is there a pin used for controling the output of SIM_1V8 .Actually some 4G modules have this pin .

What does the pin control the output of SIM_1V8 for? Is it for SIM and eSIM as nRF9160-DK?

Mac-fang said:

And there are two buttons in DK for nRF9160 , what are they used for ? 

 Button 1 and Button 2 are for the user's application. See Buttons, slide switches, and LEDs.

-Amanda H.

[Mac-fang]

Hi 

  I had checked the DK board. It can provide SIM 1.8V when put the SIM inside. So  how is it working ? 

 Could you  help me check the design ? Thanks,  i think something are missed.

OCL-0001.sch.pdf

[JONATHAN LL]

Hi,


the SIM_DET should be left open/floating,





Try to remove R2 and see if it it is detected.


Regards,
Jonathan