Issue host selection for nRF7002 .

[ngocxzv]

Hi, I am having a project WiFi 5G-Bluetooth Bridge.

My device supports connecting 10 devices simultaneously via BLE.

To optimize cost I choose nRF52832 as host instead of nRF52840 (or nRF5340) as recommended in the datasheet.

So what problems will i have when using nRF52832 as host?

eg.

-How much ram,flash memory for application layer when i have 10 devices simultaneously and wifi protocol stack?

-Is the SPI communication rate between nRF52832 and nRF7002 the WiFi rate?

[Håkon Alseth]

Hi,

 

The restriction in supported devices are due to the flash size required when adding nRF7002 to your design.

-How much ram,flash memory for application layer when i have 10 devices simultaneously and wifi protocol stack?

This highly depends on the type of application and what is required, but if you need wifi STA (ie. where you are connected to an access point), the requirement will be >500 kB flash usage for most applications.

The supported devices at this time is nRF9160, nRF52840, and nRF5340.

-Is the SPI communication rate between nRF52832 and nRF7002 the WiFi rate?

The overall throughput will be lowered when using SPI as compared to QSPI. Here's an example from the nRF7002 PS (SPIM at 24 MHz):

https://infocenter.nordicsemi.com/topic/ps_nrf7002/chapters/functional/doc/qspi_timing.html?cp=3_0_0_6_2

 

Kind regards,

Håkon

[ngocxzv]

Your answer is very clearly. Thanks so much.