nRF7002 Power Supply Voltages

[stevely630]

Hi I'm trying to get more insight about nRF7002 power supply requirements. My last question didn't get a follow up so I guess a block diagram of the internal power arch was too much to ask. But could you at least share what is the nominal voltage I should expect to see on the power pins ?

Interested in SXLDO, PALDO, RFVDD, RFBUCKVDD, XOLDO, AFELDO, AFEVBAT, VDD_BUCK, BUCKVMID, DIGVDD. 

And if you could share which ones are most important to have low noise so I can add TPs to make it easier to measure in my target application. 

Thanks, Steve 

[Kenneth]

But could you at least share what is the nominal voltage I should expect to see on the power pins ?

Interested in SXLDO, PALDO, RFVDD, RFBUCKVDD, XOLDO, AFELDO, AFEVBAT, VDD_BUCK, BUCKVMID, DIGVDD.

Sorry no, this may change on operation mode, but also due to production trim in our production or for other reasons to ensure the nRF7002 meet the functional and electrical specifications stated in the datasheet. So, you should not rely on measuring on these power pins, instead you can do functional tests, current consumption tests and radio tests to ensure the product meet your requirements.

Kenneth

[stevely630]

Ok well your reference design doesn't appear to be very optimized on the manufacturing side because for example it calls out three different 1uf caps with different voltages when probably one pn could have sufficed. And there aren't enough breadcrumbs in the datasheet to figure out what is the real requirement so I could either convince myself it really is the best design or improve upon it in a deliberate way. 

[Kenneth]

Good catch, I have reported it. 

Kenneth

[Kenneth]

Feedback:

There is an option to use the higher voltage tolerant caps for all.

1uF can use the C5 cap 35V and X5R for all three.

2.2uF can use the C9/18 cap 25V X5R 0402 cap for all if you like, but note that C15 is ok to use a 0201 cap.

Hope that helps,

Kenneth