Dynamic enabling/disabling SKY66112

[riataman]

Hello, I'm using Fanstel's BT840X that includes a SKY66112 front end.

It works great with the FEM module in NRF Connect SDK.

My problem is that my device has the option to run on batteries or wired to power.

I would like to be able to disable the  SKY66112 when in batteries. I'm OK with that requiring a chip restart. 

I can't seem to be able to take control of the FEM pin assigments or to reverse their polarity so they are disabled. 

I can control CPS and CHL but that's not enough to completely disable the SKY66112 and get the lowest power consumtion.

[Vidar Berg]

Hello,

Based on table 6 in the datasheet (https://no.mouser.com/datasheet/3/564/1/SKY66112_11_203225P.pdf), the FEM should already be in all off mode between RADIO transactions. If you are using the radio while battery powered you still need to enable the FEM on RX and TX, but you can assert the CPS signal to use the bypass mode to reduce the peak currents.

Best regards,

Vidar