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WL1835MOD: how to transform BT RSSI value in real power(dbm)?

kevin Lin
Prodigy 185 points
Part Number: WL1835MOD
Other Parts Discussed in Thread: CC2564C, WL1833

hi,

how to transform  BT RSSI value in real power(dbm)?

According to Bluetooth specification,any positive RSSI value returned by the Controller indicates how many dB the RSSI is above the upper limit, any negative value indicates how many dB the RSSI is below the lower limit. The value zero indicates that the RSSI is inside the Golden Receive Power Range." 

what's the upper limit and lower limit power value or definition in WL1833 and CC2564C?

Does RSSI value increasing one unit means real receiving power increasing 1dB?

best,

Kevin

  • 0
    Prodigy 185 points

    sorry, about the third question, how precise does chip identify?

  • 0
    TI__Mastermind 29301 points

    Kevin,

    kevin Lin said:
    what's the upper limit and lower limit power value or definition in WL1833 and CC2564C?

    The upper limit for the golden range is -54dBm and the lower limit for the golden range is -74dBm. These values are internal to the chip, meaning they do not take in account the loss on your board.

    kevin Lin said:
    Does RSSI value increasing one unit means real receiving power increasing 1dB?

    Yes, a positive RSSI value indicates how many dB the RSSI is above the upper limit of the golden range and a negative RSSI value indicates how many dB the RSSI is below the lower limit of the golden range.

    This is according to the HCI_Read_RSSI command documentation from the BT spec. The precision of the value reported by this command cannot be guaranteed. For better precision, please use the HCI_VS_Read_RSSI (0xFDFC) vendor specific command that returns the RSSI value without the golden range.

    Best regards,
    Vihang