1. Received Signal Strength Indicator (RSSI)

The Received Signal Strength Indicator is characterized by:

• Minimum RSSI level is -91 dBm (RSSI_BASE_VAL)
• Dynamic range is 81 dB
• Minimum RSSI value is 0
• Maximum RSSI value is 28

1.1. Reading RSSI

In Basic Operating Mode the RSSI value is valid in any receive state, and is updated every tTR25 = 2 µs to register 0x06 (PHY_RSSI). It is not recommended to read the RSSI value when using the Extended Operating Mode. The automatically generated ED value should be used alternatively

Bit [4:0] - RSSI The result of the automated RSSI measurement is stored in register bits RSSI. The value is updated every 2 µs in receive states. The read value is a number between 0 and 28 indicating the received signal strength as a linear curve on a logarithmic input power scale (dBm) with a resolution of 3 dB. An RSSI value of 0 indicates an RF input power of PRF < -91 dBm, a value of 28 a power of PRF 10 dBm

1.2. Data Interpretation

The RSSI value is a 5-bit value indicating the receive power, in steps of 3 dB and with a range of 0 - 28. An RSSI value of 0 indicates a receiver RF input power of PRF < -91 dBm. For an RSSI value in the range of 1 to 28, the RF input power can be calculated as follows:

PRF = RSSAI_BASE_VAL + 3*(RSSI -1) [dBm]

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