Maximum Rssi value that can be received by the nRF52832 SoC in dBm

[Brosnan]

Hi,

I wanted to know the RSSI value where the receiver saturates when receiving data from a high output power transmitter.

Thanks

[awneil]

See the Product Specification: 

infocenter.nordicsemi.com/.../radio.html

[Brosnan]

Thank you for your response Awneil. But I couldn't find the maximum recieve rssi value in this list.

[awneil]

[Brosnan]

Oh thanks Awneil. So the spec says it should be typically 0dBm. 

We have designed a BLE module with nRF52832 + SKY66112 PA frontend. I was using 2 of these modules, one as transmitter and the other as receiver. The transmitter was transmitting at max output of 21dBm. The modules were fairly close to each other.

I checked the RSSI on the receiver and noticed that it never went above -14dBm. Is there any reasoning you can think of for this to happen?

[awneil]

Brosnan said:

The transmitter was transmitting at max output of 21dBm

How do you determine that?

What are the gains of your antennas?

etc

[run_ar]

The rssi valid range is -90 to -20 dBm. Please see Received Signal Strength Indicator (RSSI) specifications.

In addition you need to do tethered measurements to know the strength of the input signal.

[Brosnan]

Valid range is -90 to -20 dBm, so the signal strength I see of -14dBm is not very accurate? Also i wanted to know why it saturates at -14dBm and not go above it. I feel it should go above -14dBm because i see that value at 30cm distance between transmitter and receiver and still see the same value when I touch them together

[run_ar]

The RSSI is designed to have a valid range of -90 to -20 and will saturate somewhere above that. Seems that is around -14 dBm, but it is not something we specify as it is out of range.

[Brosnan]

okay, so I'll take it as a saturation level. Thanks for your help