CC2430-RTR1-F64Z datasheet(181/234 Pages) TI

181 / 234 page

CC2430

CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A

Page 181 of 232

14.21 MAC Security Operations (Encryption and Authentication)

CC2430 features hardware IEEE 802.15.4

MAC security operations. Refer to section

13.9 on page 135 for a description of the

AES encryption unit.

14.22 Linear IF and AGC Settings

C2430 is based on a linear IF chain where

the signal amplification is done in an

analog VGA (variable gain amplifier). The

gain of the VGA is digitally controlled.

The AGC (Automatic Gain Control) loop

ensures that the ADC operates inside its

dynamic range by using an analog/digital

feedback loop.

The AGC characteristics are set through

the AGCCTRLL:AGCCTRLH, registers. The

reset values should be used for all AGC

control registers.

14.23 RSSI / Energy Detection

CC2430 has a built-in RSSI (Received

Signal Strength Indicator) giving a digital

value that can be read form the 8 bit,

signed 2’s complement RSSIL.RSSI_VAL

The RSSI value is always averaged over 8

symbol periods (128 µs), in accordance

with [1].

The RSSI register value RSSI.RSSI_VAL

can be referred to the power P at the RF

pins by using the following equations:

P = RSSI_VAL + RSSI_OFFSET [dBm]

where

the

RSSI_OFFSET

found

empirically during system development

from the front end gain. RSSI_OFFSET is

approximately –45. E.g. if reading a value

of –20 from the RSSI register, the RF

input power is approximately –65 dBm.

A typical plot of the RSSI_VAL reading as

function of input power is shown in Figure

53. It can be seen from the figure that the

RSSI reading from

CC2430 is very linear

and has a dynamic range of about 100 dB.

-60

-40

-20

-100

-80

-60

-40

-20

RF Level [dBm]

Figure 53: Typical RSSI value vs. input power

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