Can nRF24L01 leave the RX mode with CE tied to VDD?

[MCY]

Hello.

I am trying to save i/o lines on an 8-pin PIC, and planning to run an nRF24L01P with its CE pin tied to VDD. I am willing to power-down to get out of the RX mode occasionally (as I need to do in order to use the W_REGISTER command which is not allowed in RX). The state diagram in specs indicate that I can get out of RX either by setting CE=0 (which I do not want) or by powering-down. But how can I power-down if I cannot write to the CONFIG register in RX mode?

Regards..

[Kenneth]

Hi, most likely this will work. It's not tested and qualified operation, but it is technically possible to set CE high all the time, and write the PWR_UP bit in the CONFIG register, and change configuration when in power down. There will effectively be a 1.5ms delay when changing configuration when enable PWR_Up bit again, due to the startup of the 16MHz crystal, but likely it will work.

[MCY]

Thanks for the answer. I was worried by the statement "Executable in power down or standby modes only" associated with the W_REGISTER command in the specs. If I cannot use this command, I cannot change the PWR_UP bit. What I understand from your answer is that the command may still work, though "not tested and qualified". I guess I will try and see if the operation can be performed consistently with the modules I have. Thanks again..