nRF9160 sch review for SPI Flash and RF frequency switching control

[koen.chen]

Dears

My customer is using nRF9160，Two SPI interfaces are being used，one for LCD，Another one for SPI Flash，LCD SPI has been debugged，SPI Flash is a newly added device，U8807 in SCH file。

Pls help check SPI Flash interfaces。

In addition, because antenna debugging requires adding antenna switches to distinguish the matching of low-frequency and high-frequency bands, which GPIO ports can be used as the control of antenna switches (different frequency bands choose different matching parameters)，At least 2 gpios are required。

2437.u8_9160_sch.pdf

[Kaja]

Hi,

here are my comments:
1. Why do you need a bypass to J4? Do you plan to not have the J4 for on the end product? 
2. The filter FL82 should be on the input of the LNA, we recommend to us a LNA with a internal filter or add a external filter on the input of the LNA. 
3. Is the plan to be able to connect an external active antenna to J4801? 

SPI
4. Why is VLF_9160 connected to CS, I can see that R5747 is N.C.? 

They need to control and check functionally of their own SPI devices. 

Best regards,
Kaja

[koen.chen]

Dear Kaja

Thanks for your suggestion。

In addition, because antenna debugging requires adding antenna switches to distinguish the matching of low-frequency and high-frequency bands, which GPIO ports can be used as the control of antenna switches (different frequency bands choose different matching parameters)，At least 2 gpios are required。

[Kaja]

Hi, 

we have an antenna tuner example, using MAGPOI0,1 and 2. 

Best regards,
Kaja