How is RSSI related to real dBm value in nRF51 chip?

[Bentleylust]

Hello,

I am aware that according to IEEE standards RSSI value that chips return is not officially related to mW/dBm. However the values returned by your chips seem to be translated to dBm.

Could you tell me how accurate is the RSSI value (assuming it is really in absolute dBm) that your chips return is and on what basis the power measurement is performed?

Thanks

[Jørgen Holmefjord]

RSSI is given in dBm. See the answers in this thread. According to chapter 8.6 of the nRF51822 Product Specification v3.3, the accuracy is ±6dB. The nRF51 radio measures the strength of the received radio signal and calculates an approximate RSSI value from this.

[Bentleylust]

Thank you very much for this information.