250 kbit/s Nordic proprietary radio mode on nrf52840

[vasilje]

Hi,

I am using nrf5 SDK and working on proprietary Nordic. I saw that in the code there is no option for 250 kbit/s Nordic proprietary for nrf52840. However in nrf52_bitfields.h I can see that this option was available but in the comment it is stated:

#define RADIO_MODE_MODE_Nrf_250Kbit (2UL) /*!< Deprecated enumerator -  250 kbit/s Nordic proprietary radio mode */

I was wandering if there is still some possibility to experiment with 250kbit/s with Nordic proprietary?

Best,

[Simonr]

Hi

As the sensitivity is similar in 1Mbps mode in the nRF52 series, the 250kbps mode has little use. The mode still remains in the nRF52 series devices, but it is not tested, so you can't rely on this mode if you're making a product. Even if it works on one device in the lab it might fail if you try a different device. 

Regarding the change in sensitivity this was one of the reasons this mode was removed. In the nRF52 we achieved the same sensitivity in 1Mbps mode that the nRF51 had in 250kbps mode (-96dBm), and as such the need for this mode was considered smaller. This means that the only effect of using this mode in the nRF52 is higher average current draw and a higher chance of packet collisions, because the packets are 4 times as long.

Best regards,

Simon