Forum Post: RSSI accuracy for CC2420

Hi,

CC2420 returns RSSI in integer. How does it compute RSSI from the actual signal strength? Round up, round down, or something else? For instance, if the actual signal strength is -71.9 dBm, what would CC2420's RSSI be?

According to the datasheet, typical RSSI accuracy is +/-6 dB. Does this mean measured RSSI can deviate 6 dB from actual RSSI? What are the major causes of the large error if present?

Thanks in advance.