Hi Vegard,

     What's your performance difference requirements between 868MHz and 915MHz?  I think you can use each reference circuits for both band if the difference < 1dB. You can compare it if you have the demo boards. You can get refer to following application note for the reference circuits: https://www.silabs.com/documents/public/application-notes/AN648.pdf

Regards,

Jun

Hi,

    You can use 868MHz reference design for your 865-867MHz band. Please read the following application note for reference circuits:

https://www.silabs.com/documents/public/application-notes/AN648.pdf

Regards,

Jun

Hi Drauzio,

     There is no data for noise figure with EFR32MG chip. But it recommends to use the external LNA to improve the sensitivity, the sensitivity maybe 3-5dB improved according to your external LNA's noise figure.

     For the SAW usage, it recommends to use if there is strong interfere close to carrier. Please refer to the blocking performance of the chip to decide the SAW usage.

Regards,

Jun

Hi,

     You should connect it with setting  'Debug Mode' to Out. Please try to connect your customer board to BRD4001A with 10-pin mini simplicity debug connector for a try.

Regards,

Jun

You should connect these debug signals to P800 connector of BRD4001A, and power your custom board with external power supply since the pin1 of P800 is only for detect and not for power.

Regards,

Jun

Hi,

    It is possible damaged by EOS or ESD. Please contact your local FAE or sales man for further RMA analyse.

Regards,

Jun

Hi,

    I think you have connected your power pins to 3.3V correctly. The R1 can be removed since there is no need such strong pull-up resistor for reset signal. For the crystal, I am not sure you can add external 10pF capacitor to crystal. Usually the chip's internal capacitor bank can provide 7-12pF Cload to crystal, it doesn't need external capacitor if your crystal requires 7-12pF Cload. It can add external capacitor if the crystal requires > 12pF Cload.

    But I think the key point is that the SiM3xxxx debugger doesn't support EFR32 chips. I recommend you to use Silabs' BRD4001A mainboard to debug the EFR32 chips, it will use a 10-pin debug connector different from SiM3xxxx debugger, please refer to AN958 for more details:  https://www.silabs.com/documents/public/application-notes/an958-mcu-stk-wstk-guide.pdf .

Regards,

Jun

Hi Khan,

     As i know, there are 169MHz,390MHz, 434MHz, and 460-470MHz evaluation boards available for Si446x chips.

     For these demo boards, you can directly use them if your desired frequency is around +/-5% of fc. You should tune it to your desired operation frequency if it is out of +/- 10% of fc.

Regards,

Jun

Hi Steven,

     Yes, you can refer to BRD4258A for the matching circuits. But it can generate +20dBm output power with 100 to 125 ohms differential Rload at 3.3V power voltage level. But if you have a maximum 2.85V power supply, i think you can just get +18dBm to +19dBm output power, you can't get +20dBm output power in lower power voltage.

Regards,

Jun

Hi Khalid,

     Basically these modules have FCC certification IDs which registered in the regulation. You can directly cite them. For detail procedure, you can consult your local FCC test lab.

Regards,

Jun