MRF49XA-I/ST Microchip Technology, MRF49XA-I/ST Datasheet - Page 60

• Manufacturer Part Number: MRF49XA-I/ST
• Description: IC RF TXRX 433/868/915 16-TSSOP
• Manufacturer: Microchip Technology

Specifications of MRF49XA-I/ST

• Package / Case: 16-TSSOP
• Frequency: 433MHz, 868MHz, 915MHz
• Data Rate - Maximum: 256kbps
• Modulation Or Protocol: FHSS, FSK
• Applications: Home / Industrial Automation, Remote Access, Security Alarms
• Power - Output: 7dbm
• Sensitivity: -110dBm
• Voltage - Supply: 2.2 V ~ 3.8 V
• Current - Receiving: 11mA
• Current - Transmitting: 15mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Number Of Receivers: 1
• Number Of Transmitters: 2
• Wireless Frequency: 433 MHz to 915 MHz
• Output Power: + 7 dBm
• Operating Supply Voltage: 2.5 V, 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Modulation: FHSS, FSK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 579-MRF49XA-1/ST

TABLE 3-2:
FIGURE 3-11:
3.13.1
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 data indicator output 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”.
DS70590B-page 58
MRF49XA
RSSI Threshold
Reserved
Reserved
RELATIONSHIP BETWEEN RSSI
AND CLOCK RECOVERY
-103
-73
-79
-85
-91
-97
-112
DIGITAL RSSI THRESHOLD LEVELS
INPUT POWER
-102
-92
DRSSIT2
VS
1
1
1
1
0
0
0
0
. ANALOG RSSI VOLTAGE
Input Power (dBm)
-82
Preliminary
-72
3.13.2
The Keep Offset mode of automatic configuration of
AFC (i.e., AUTOMS1 = 1, AUTOMS0 = 1) is recom-
mended 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)
DRSSIT1
1
1
0
0
1
1
0
0
-62
RELATIONSHIP BETWEEN RSSI
AND AFC
-52
© 2009 Microchip Technology Inc.
-42
DRSSIT0
1.2
1
0.8
0.6
0.4
0.2
0
1
0
1
0
1
0
1
0