nRF52805 WLCSP with 10 GPIOs for SPI reading multiple SPI sensors

[Jack Phan]

Dear Support,

I'm evaluating a tiny BLE chip that we can do:

•  reading multiple three SPI sensors: pressure sensor, accelerometer, and FRAM. 

So with your BLE chip,  nRF52805 WLCSP with 10 GPIOs, can handle this task?

Also, in the examples, do you have one example that reading an SPI sensor on a Development Kit?

Thanks a lot for your time,

Jack

[Jack Phan]

Hi Jorgen,

It’s great to have your response.

In my application, the device will communicate with three SPI sensors/FRAM. And the device also has an external RTC 32.768 kHz. That’s all, and we have no LEDs, no buttons, just power ON and working.

We need a tiny footprint, and that’s the main reason we’re interested in nRF52805.

With my description above, do you think your BLE nRF52805 with 10 GPIOs can handle it? (does JTAG loading the firmware need any pin from 10 GPIOs?)

Thanks a lot for your time,

Jack

[Jørgen Holmefjord]

Jack Phan said:

With my description above, do you think your BLE nRF52805 with 10 GPIOs can handle it?

Yes, sounds like you will have two GPIOs available for other purposes after connecting SPI devices and LF crystal.

Jack Phan said:

does JTAG loading the firmware need any pin from 10 GPIOs?

Programming is done through SWD interface. SWDIO/SWDCLK is located on pin F1 and G1 according to WLCSP ball assignments. These pins are not shared with the GPIOs.

[Jack Phan]

It's great!

Thanks for your time,

Jack