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PDF RFM73 Data sheet ( Hoja de datos )

Número de pieza RFM73
Descripción Low Power High Performance 2.4 GHz GFSK Transceiver
Fabricantes HOPERF 
Logotipo HOPERF Logotipo



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No Preview Available ! RFM73 Hoja de datos, Descripción, Manual

RFM73
Low Power High Performance 2.4 GHz GFSK Transceiver
Features
2400-2483.5 MHz ISM band operation
Support 250Kbps, 1Mbps and 2 Mbps air
data rate
Programmable output power
Low power consumption
Tolerate +/- 60ppm 16 MHz crystal
Variable payload length from 1 to32bytes
Automatic packet processing
6 data pipes for 1:6 star networks
1.9V to 3.6V power supply
4-pin SPI interface with maximum 8MHz
clock rate
Compact 20-pin 3x3 or 4x4mm QFN
package
Applications
Wireless PC peripherals
Wireless mice and
keyboards
Wireless gamepads
Wireless audio
VOIP and wireless headsets
RFP
11
VDDPA
VDD
VSS IREF
67
8
9 10
IRQ VDD VSS XTALP XTALN
Remote controls
Consumer electronics
Home automation
Toys
Personal health and entertainment
Block Diagram
RFP
RFN
FM
Demodulator
Data Slicer
Integrated
TDD RF
Transceiver
Power
Management
FM Modulator
Gaussian
shaping
Rx FIFO
Packet
Processing &
State Control
Tx FIFO
CSN
SCK
MOSI
MISO
IRQ
CE
Free Datasheet http://www.datasheet4u.com/

1 page




RFM73 pdf
2 Abbreviations
ACK
ARC
ARD
CD
CE
CRC
CSN
DPL
FIFO
GFSK
GHz
LNA
IRQ
ISM
LSB
MAX_RT
Mbps
MCU
MHz
MISO
MOSI
MSB
PA
PID
PLD
PRX
PTX
PWD_DWN
PWD_UP
RF_CH
RSSI
RX
RX_DR
SCK
SPI
TDD
TX
TX_DS
XTAL
Acknowledgement
Auto Retransmission Count
Auto Retransmission Delay
Carrier Detection
Chip Enable
Cyclic Redundancy Check
Chip Select Not
Dynamic Payload Length
First-In-First-Out
Gaussian Frequency Shift Keying
Gigahertz
Low Noise Amplifier
Interrupt Request
Industrial-Scientific-Medical
Least Significant Bit
Maximum Retransmit
Megabit per second
Microcontroller Unit
Megahertz
Master In Slave Out
Master Out Slave In
Most Significant Bit
Power Amplifier
Packet Identity Bits
Payload
Primary RX
Primary TX
Power Down
Power Up
Radio Frequency Channel
Received Signal Strength Indicator
Receive
Receive Data Ready
SPI Clock
Serial Peripheral Interface
Time Division Duplex
Transmit
Transmit Data Sent
Crystal
RFM73
Page 4 of 27
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com
Free Datasheet http://www.datasheet4u.com/

5 Page





RFM73 arduino
RFM73
EN_DYN_ACK bit. When you use this option,
the PTX goes directly to standby-I mode after
transmitting the packet and the PRX does not
transmit an ACK packet when it receives the
packet.
5.1.4 Payload
The payload is the user defined content of the
packet. It can be 0 to 32 bytes wide, and it is
transmitted on-air as it is uploaded
(unmodified) to the device.
The RFM73 provides two alternatives for
handling payload lengths, static and dynamic
payload length. The static payload length of
each of six data pipes can be individually set.
The default alternative is static payload length.
With static payload length all packets between
a transmitter and a receiver have the same
length. Static payload length is set by the
RX_PW_Px registers. The payload length on
the transmitter side is set by the number of
bytes clocked into the TX_FIFO and must
equal the value in the RX_PW_Px register on
the receiver side. Each pipe has its own
payload length.
Dynamic Payload Length (DPL) is an
alternative to static payload length. DPL
enables the transmitter to send packets with
variable payload length to the receiver. This
means for a system with different payload
lengths it is not necessary to scale the packet
length to the longest payload.
With DPL feature the RFM73 can decode the
payload length of the received packet
automatically instead of using the RX_PW_Px
registers. The MCU can read the length of the
received payload by using the command:
R_RX_PL_WID.
In order to enable DPL the EN_DPL bit in the
FEATURE register must be set. In RX mode
the DYNPD register has to be set. A PTX that
transmits to a PRX with DPL enabled must
have the DPL_P0 bit in DYNPD set.
5.1.5 CRC
The CRC is the error detection mechanism in
the packet. The number of bytes in the CRC is
set by the CRCO bit in the CONFIG register.
It may be either 1 or 2 bytes and is calculated
over the address, Packet Control Field, and
Payload.
The polynomial for 1 byte CRC is X8 + X2 +
X + 1. Initial value is 0xFF.
The polynomial for 2 byte CRC is X16 + X12 +
X5 + 1. Initial value is 0xFFFF.
No packet is accepted by receiver side if the
CRC fails.
5.2 Packet Handling
RFM73 uses burst mode for payload
transmission and receive.
The transmitter fetches payload from TX FIFO,
automatically assembles it into packet and
transmits the packet in a very short burst
period with 1Mbps or 2Mbps air data rate.
After transmission, if the PTX packet has the
NO_ACK flag set, RFM73 sets TX_DS and
gives an active low interrupt IRQ to MCU. If
the PTX is ACK packet, the PTX needs
receive ACK from the PRX and then asserts
the TX_DS IRQ.
The receiver automatically validates and
disassembles received packet, if there is a
valid packet within the new payload, it will
write the payload into RX FIFO, set RX_DR
and give an active low interrupt IRQ to MCU.
When auto acknowledge is enabled
(EN_AA=1), the PTX devicewill
automatically wait for acknowledge packet
after transmission, and re-transmit original
packet with the delay of ARD until an
acknowledge packet is received or the number
of re-transmission exceeds a threshold ARC. If
the later one happens, RFM73 will set
MAX_RT and give an active low interrupt
Page 10 of 27
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com
Free Datasheet http://www.datasheet4u.com/

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