MRF49XA-I/ST Microchip Technology, MRF49XA-I/ST Datasheet - Page 66

• 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

3.17
In Data Transmission mode (enabled by the TXDEN bit
(GENCREG<7>)), the TX data is clocked into one of
the two 8-bit data registers. The transmitter starts to
send the data from the first register (with the given bit
rate) when the TXCEN bit (PMCREG<5>) is set. The
initial value of the data registers (0xAA) can be used to
generate preamble. During this mode, the SDO pin is
monitored to check whether the register is ready (SDO
is high) to receive the next byte from the micro-
controller. The block diagrams of the Transmit register,
before and during transmit, are shown in Figure 3-14
and Figure 3-15, respectively.
FIGURE 3-14:
DS70590B-page 64
MRF49XA
Serial Bus Data
TX Register Buffered Data
Transmission
(Register Initial Fill-up)
SCLK
TXCEN = 0
TX REGISTER BLOCK DIAGRAM (BEFORE TRANSMIT)
CLK
SDI
SDI
CLK
Preliminary
8-Bit Shift Register
8-Bit Shift Register
(Default: AAh)
(Default: AAh)
The transmitter FSK modulation parameters are used
for calculating the resulting output frequency, as shown
in Equation 3-6.
EQUATION 3-6:
f
where:
f
(see Register 2-6 for f
MB is the 4-bit Binary Number (MODBW<3:0>)
SIGN = MODPLY
FSKOUT
0
is the Channel Center Frequency
= f
0
+ (-1)SIGN x (MB + 1) x (15 kHz)
SDO
SDO
XOR
0
calculation)
© 2009 Microchip Technology Inc.
FSK
TX_DATA