nRF24L01RF datasheet contradiction?

RE: nRF24L01RF datasheet contradiction?

ECEJeff — Tue, 23 Jun 2015 14:43:28 GMT

There seems to be some confusion about the bit numbering. In the nRF24L01 datasheet the bits are numbered from 7 (highest) to 0 (lowest). I think you're thinking bit 7 is the 7th bit, which is not the case. Bit 7 is the 8th bit (likewise bit 0 is the 1st).

The datasheet is completely correct, and the register bits 6:0 can hold values 7-bits wide, which is to say any number from 0 to 127.

RE: nRF24L01RF datasheet contradiction?

Asbjørn — Wed, 11 Feb 2015 16:54:54 GMT

I do see your point and the contradiction you point out. I just wanted to clarify why we have chosen to "hide" it.

RE: nRF24L01RF datasheet contradiction?

Radian — Thu, 05 Feb 2015 17:52:28 GMT

Asbjørn, I do understand that passing regulatory requirements is my responsibility. By "safely" I refer to the contradiction between the observation that channel values of 64 to 125 do appear to work while the datasheet tells me to only program a channel value of 63 or less.

Do you therefore agree that we can Answer my opening query: "nRF24L01RF datasheet contradiction?" in the affirmative? As a diligent application engineer I am bound to take heed of all instructions given by product manufacturers including any errata.

RE: nRF24L01RF datasheet contradiction?

Asbjørn — Thu, 05 Feb 2015 15:09:24 GMT

I can't say safely as you have to test and make sure you're not breaking any regulatory requirements with your application. Functionality wise on the chip, you should be able to utilize the full range of frequencies.

RE: nRF24L01RF datasheet contradiction?

Radian — Wed, 04 Feb 2015 14:15:41 GMT

Thanks for your reply. I have obtained another set of modules now from a different supplier and the full range of frequencies now work as you describe. I suspect that the other modules had an inferior layout using the earlier version of the chip.

I'm now working with nRF24L01+ but the datasheet (nRF24L01P_Product_Specification_1_0 page 58) still describes RF_CH as a 6-bit field with bit 7 reserved ...

05 RF_CH RF Channel Reserved 7 0 R/W Only '0' allowed RF_CH 6:0 0000010 R/W Sets the frequency channel nRF24L01+ operates on

Can I safely ignore the instruction that only 0 is allowed in bit 7?

RE: nRF24L01RF datasheet contradiction?

Asbjørn — Tue, 03 Feb 2015 15:09:48 GMT

No, the chips radio is built for operation up to 2.525 GHz as some countries allows for use up to this. The world wide ISM band is between 2.400 GHz and 2.480 GHz. The recommendation is to stay within the ISM band in order to be able to sell your product across the world.

I'm not sure what you are writing to the chip, but you should be able to use all these channels. May I ask what you have tested since you see a restriction to channel 62.