MRF49XA-ISLASHT datasheet(60/102 Pages) MICROCHIP

60 / 102 page

MRF49XA

DS70590C-page 60

Preliminary

FIGURE 3-11:

INPUT POWER VS. ANALOG RSSI VOLTAGE

3.13.1

RELATIONSHIP BETWEEN RSSI

AND CLOCK RECOVERY

The DIO signal response time setting is configured

through RXCREG and has the following modes of

operation:

• Normal mode

• Slow mode

• Medium mode

•Fast mode

These operation modes are configurable through

BBFCREG.

In Medium mode, the DIO signal is active when the

CR_LOCK and the DRSSI or the DQI signals are high.

The DIO goes low when either the CR_LOCK turns

inactive, or the DRSSI or DQI signals go low. For more

details on DQI, see Section 3.11, Data Quality

Indicator.

3.13.2

RELATIONSHIP BETWEEN RSSI

AND AFC

The Keep Offset mode of automatic configuration of

AFC (i.e., AUTOMS1 = 1, AUTOMS0 =

1) is

recommended to be used when a receiver operates

with only one transmitter. After a complete measuring

cycle, the measured value is kept independent from

the state of the DIO signal. In this mode, the DRSSI

limit should be carefully selected to minimize the range

hysteresis.

The registers associated with RSSI are:

•STSREG (see Register 2-1)

• GENCREG (see Register 2-2)

• RXCREG (see Register 2-7)

• PMCREG (see Register 2-13)

TABLE 3-2:

DIGITAL RSSI THRESHOLD LEVELS

RSSI Threshold

DRSSIT2

DRSSIT1

DRSSIT0

Reserved

-73

-79

-85

-91

-97

-103

0.2

0.4

0.6

0.8

1.2

-112

-102

-92

-82

-72

-62

-52

-42

Input Power (dBm)

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