BLE power profiles for RF81822

[leonardi]

I need to evaluate the real consumption of current for BLE events on RF81822. The HFCLK is 16MHz and the 32kHz clock is external.

S110 Soft Device Specification V1.2 document describes the profiles for connection and advertising events. The nRF81822 PS document details the values for each current but I could not find the exact timing of stages. Where can I get these values?

Another question about the profiles: There is no reference to Icrypto in PS. Should I use Iccm instead?

[Asbjørn]

The duration of the various stages is dependent on the configuration of the Bluetooth link and how much pre- and post-processing is needed, so I'm not able to give you an exact answer.

We made an application note based around our nRF8001. The values won’t be the same, but the principal on how you do the measurements dynamically would be exactly the same. www.nordicsemi.com/.../89717035 So you'll be better of using the method described in the white paper mentioned previously and check with your configuration and use case. If you say 100 us pre-processing, 300 us TX 200 us RX and then 200 us post processing, I'm pretty sure you'll be within the ballpark of estimates at least. You have to measure your own use case though to make sure.

Regarding crypto, the Icrypt for BLE will be the Iccm.

Related to the radio transition/radio switch times are stated in the product specification chapter 8.5.6. Depending on which stack you are using it will enter RX or TX first. If you are using the S110 peripheral stack it will enter RX first and then switch to TX. The number for startup and switching are all in chapter 8.5.6. The current consumption of the various stages are defined in the sub-chapters of chapter 8.

Product specification: www.nordicsemi.com/.../77042252