nrf21450 two antenna and UICR program

[noseed]

Hi, 

I have two questions about the nRF21540.

Why are there two antenna outputs on the nRF21540?
(Is it for AoA / AoD?)

If the UICR program is below 3.45V, doesn't it work or can't store the value?

Thank you.

[Håkon Alseth]

Hi,

 

 

Why are there two antenna outputs on the nRF21540?
(Is it for AoA / AoD?)

 It is provided for the possibility to perform antenna diversity.

If the UICR program is below 3.45V, doesn't it work or can't store the value?

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

[noseed]

hi

Håkon Alseth said:

UICR for the nRF21540 is one time programmable

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

[Håkon Alseth]

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

[Atlas]

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.

BR

Atlas