nrf9160 hardware

RE: nrf9160 hardware

JONATHAN LL — Tue, 02 Feb 2021 10:37:49 GMT

Hi,

Information regarding SIM interface:
https://infocenter.nordicsemi.com/topic/nwp_034/WP/nwp_034/nwp_034_uicc_interface.html?cp=2_0_7_1_2_3

https://infocenter.nordicsemi.com/topic/nwp_037/WP/nwp_037/uicc_if.html?cp=2_0_7_0_3_9

https://infocenter.nordicsemi.com/topic/nwp_037/WP/nwp_037/uicc_if_esd.html?cp=2_0_7_0_3_9_0

https://infocenter.nordicsemi.com/topic/nwp_037/WP/nwp_037/uicc_if_pcb.html?cp=2_0_7_0_3_9_1

ESD filtering is recommended, see ref design:

It is possible to use discrete components to filter.

Discrete ESD protection can consist of the following components:
• Bypass capacitors in the range of ≤ 22 pF to SIM_RST, SIM_DET, SIM_CLK, SIM_IO, and SIM_1V8.
• A separate supply capacitor ranging from 100 nF to 220 nF connected to SIM_1V8 can be considered.

• Low capacitance type ESD diodes to SIM_RST, SIM_DET, SIM_CLK, SIM_IO, and SIM_1V8.
• Multichannel ESD diodes are commonly used and recommended.
• Some multichannel diode components incorporate EMI filtering. This type is recommended if the product integrates an LTE antenna or an external antenna is located close to the SIM holder.

Is the SIM holder placed close to any RF components?

If you want you can share the PCB files and i can look at the layout. If you dont want the PCB files to be public then you can make a new private ticket or we can make this ticket private.

Can you cut\disconnect SIM_DET ?

R4, R5 and R22 should not be there or changed to 0 Ohm, the impedance should be as low as possible.

Can you share what nano-SIM card holder you are using ?

Regards,
Jonathan

RE: nrf9160 hardware

Mac-fang — Mon, 01 Feb 2021 01:30:41 GMT

Hi ,

I had tried. But it seems can't make sense.

RE: nrf9160 hardware

JONATHAN LL — Fri, 29 Jan 2021 13:08:32 GMT

Hi,

the SIM_DET should be left open/floating,

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

Regards,
Jonathan

RE: nrf9160 hardware

Mac-fang — Fri, 29 Jan 2021 09:39:28 GMT

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.

devzone.nordicsemi.com/.../OCL_2D00_0001.sch.pdf

RE: nrf9160 hardware

Amanda Hsieh — Mon, 11 Jan 2021 10:33:06 GMT

Hi,

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

[quote user="Mac-fang"]is there a pin used for controling the output of SIM_1V8 .Actually some 4G modules have this pin .[/quote]

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

[quote user="Mac-fang"]And there are two buttons in DK for nRF9160 , what are they used for ? [/quote]

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

-Amanda H.

RE: nrf9160 hardware

Mac-fang — Sat, 09 Jan 2021 01:32:53 GMT

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 ?

RE: nrf9160 hardware

Amanda Hsieh — Fri, 08 Jan 2021 12:24:49 GMT

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.