nrf21450 two antenna and UICR program

RE: nrf21450 two antenna and UICR program

Atlas — Wed, 13 Jan 2021 13:24:18 GMT

Hi Hakon

I'm confused!

Does it mean I can write new value into CONFREG2 and CONFREG3 in UICR program mode after power cycle?

After power cycle, if I read CONFREG2 and CONFREG3 before write value into these register, I will get 0x00 from its, right?

Thanks.

Atlas

RE: nrf21450 two antenna and UICR program

Håkon Alseth — Thu, 23 Jan 2020 08:57:08 GMT

Sorry, I should have been more specific. The UICR eFuse is one time progarmmable, as it locks the "reset value" of the device. You can write new configuration, but it is not retained after a power cycle.

Cheers,

Håkon

RE: nrf21450 two antenna and UICR program

noseed — Wed, 22 Jan 2020 00:10:15 GMT

[quote userid="2115" url="~/f/nordic-q-a/56807/nrf21450-two-antenna-and-uicr-program/230046"]UICR for the nRF21540 is one time programmable[/quote]

Can I erase and rewrite like the nRF52xxx's UICR?

RE: nrf21450 two antenna and UICR program

Håkon Alseth — Tue, 21 Jan 2020 11:43:57 GMT

Hi,

[quote user=""]Why are there two antenna outputs on the nRF21540?
(Is it for AoA / AoD?)[/quote]

It is provided for the possibility to perform antenna diversity.

[quote user=""]If the UICR program is below 3.45V, doesn't it work or can't store the value?[/quote]

Please follow the requirements as listed in the PS: https://infocenter.nordicsemi.com/topic/ps_nrf21540/chapters/device_control/doc/uicr_program.html?cp=6_0_0_4_3

UICR for the nRF21540 is one time programmable, and if you do not follow the requirements in terms of voltage, it is not guaranteed that the program is successfully stored and the device may not function as you want it to.

Kind regards,

Håkon