CC2400-RTR1 datasheet(44/84 Pages) TI

44 / 84 page

CC2400

SWRS042A

Page 44 of 83

34 RSSI

CC2400 has a built-in RSSI (Received

Signal Strength Indicator) giving a digital

value that can be read form the

RSSI.RSSI_VAL[7:0] register.

The RSSI reading provides a measure of

the signal power entering the RF input.

The scale is logarithmic, so that

RSSI_VAL provides a value in dB.

The number of samples that are used to

calculate the average signal amplitude is

controlled

the

RSSI.RSSI_FILT[1:0]

RSSI filter length (averaging) can be done

over up to 8 symbols. This will determine

the response time of the RSSI.

The RSSI measurement can be referred to

the power at the RF input pins by using

the following equation:

P = RSSI_VAL + RSSI_OFFSET [dBm]

where

the

nominal

value

RSSI_OFFSET is –54dB. (If the gain in

the LNA/Mixer is changed from the default

settings, the offset is changed.)

A typical plot of the RSSI_VAL reading as

function of input power is shown in Figure

22 (for 1Mbps).

Note that the RSSI function does not take

AGC settings into consideration if the AGC

settings are overridden.

-60

-50

-40

-30

-20

-10

Input level (dBm)

250kb

10kb

Figure 22. Typical RSSI value vs. input power

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