MRF49XA-I/ST Microchip Technology, MRF49XA-I/ST Datasheet - Page 41

• 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

REGISTER 2-15:
EQUATION 2-8:
© 2009 Microchip Technology Inc.
bit 15
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 15-8
bit 7-1
bit 0
Note 1:
DC = (DCMV<7:1> x 2 + 1)/WTMV<7:0> x 100%
where:
WTMV is WTMV<7:0> bits of the WTSREG.
R/W-1
R/W-0
For operation in Duty Cycle mode, the receiver must be disabled (RXCEN = 0) and the wake-up timer
must be enabled (WUTEN = 1) in PMCREG. The registers, DCSREG and WTSREG, can be used to
reduce the current consumption of the receiver. The DCSREG can be set up so that when the wake-up
timer brings the MRF49XA out of Sleep mode, the receiver is turned on for a short period to sample the
signal presence before returning to Sleep. The process in the Duty Cycle mode starts over. The duty cycle
uses the multiplier value of the wake-up timer, in parts for its calculation, as shown in Equation 2-8.
CCB<15:8>: Command Code bits
The command code bits (11001000b) are serially sent to the microcontroller to identify the bits to be
written in the DCSREG.
DCMV<6:0>: Duty Cycle Multiplier Value bits
These bits are used to calculate the duty cycle or on time of the receiver after the wake-up timer has
brought the MRF49XA out of Sleep mode.
DCMEN: Duty Cycle Mode Enable bit
1 = Enables the Duty Cycle mode
0 = Disables the Duty Cycle mode
R/W-1
R/W-0
DCSREG: DUTY CYCLE VALUE SET REGISTER (POR: 0xC80E)
r = reserved bit
W = Writable bit
‘1’ = Bit is set
R/W-0
R/W-0
DCMV<6:0>
R/W-0
R/W-0
Preliminary
CCB<15:8>
(1)
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-1
R/W-1
R/W-0
R/W-1
x = Bit is unknown
MRF49XA
R/W-0
R/W-1
DS70590B-page 39
DCMEN
R/W-0
R/W-0
bit 8
bit 0