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参数资料
| 型号： | MRF89XA-I/MQ |
| 厂商： | Microchip Technology |
| 文件页数： | 86/140页 |
| 文件大小： | 0K |
| 描述： | TXRX ISM SUB-GHZ ULP 32QFN |
| 标准包装： | 73 |
| 系列： | * |
| 频率： | 863MHz ~ 870MHz，902MHz ~ 928MHz，950MHz ~ 960MHz |
| 数据传输率 - 最大： | 200kbps |
| 调制或协议： | FSK，OOK |
| 应用： | ISM |
| 功率 - 输出： | 12.5dBm |
| 灵敏度： | -113dBm |
| 电源电压： | 2.1 V ~ 3.6 V |
| 电流 - 接收： | 3mA |
| 电流 - 传输： | 25mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 托盘 |
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MRF89XA
3.11.4
DC-FREE DATA MECHANISMS
In this case, the maximum chip rate is the maximum bit
The payload to be transmitted may contain long
sequences of ‘ 1 ’s and ‘ 0 ’s, which introduces a DC bias
in the transmitted signal, which causes a non-uniform
power distribution spectrum over the occupied channel
bandwidth. These sequences also degrade the
performance of the demodulation and data, and clock
recovery functions in the receiver, which basically
introduces data dependencies in the normal operation
of the demodulator. System performance can be
enhanced if the payload bits are randomized to reduce
DC biases and increase the number of bit transitions.
Therefore, it is useful if the transmitted data is random
and DC-free.
To handle such instances, two techniques are available
in the packet handler: Manchester encoding and Data
Whitening. However, only one of the two methods
should be enabled at a time.
rate given in the specifications section and the actual
bit rate is half the chip rate. Manchester encoding and
decoding is only applied to the payload and CRC
checksum while preamble and Sync word are kept
NRZ. However, the chip rate from preamble to CRC is
the same and defined by the BRVAL<6:0> bits
(BRSREG<6:0>) (Chip Rate = Bit Rate NRZ = 2 x Bit
Rate Manchester).
Therefore Manchester encoding/decoding is made
transparent for the user, who still provides/retrieves
NRZ data to/from the FIFO. See the Manchester
encoding/decoding bit pattern in Figure 3-30 .
3.11.4.2 Data Whitening
Another technique called data whitening or scrambling
is widely used for randomizing the user data before
radio transmission. The data is whitened using a
random sequence on the TX side and dewhitened on
3.11.4.1
Manchester Data Encoding
the RX side using the same sequence. Compared to
Manchester encoding/decoding is enabled by setting
the MCHSTREN bit (PLOADREG<7>) and can be
used in Packet mode only. The NRZ data is converted
to Manchester code by coding ‘ 1 ’ as ‘ 10 ’ and ‘ 0 ’ as ‘ 01 ’.
Figure 3-29 illustrates Manchester data encoding. NRZ
data is converted to Manchester by encoding 1 bits as
10 chip sequences, and 0 bits as 01 chip sequences.
Manchester encoding guarantees DC-balance and
frequent data transitions in the encoded data. The
maximum Manchester chip rate corresponds to the
maximum bit rate given in the Transmitter Electrical
specifications in Table 5-6 .
Manchester technique it has the advantage of retaining
the NRZ data rate (that is, actual bit rate is not halved).
The whitening/dewhitening process is enabled by
setting the WHITEN1 bit (PKTCREG<4>). A 9-bit
Linear Feedback Shift Register (LFSR) is used to
generate a random sequence. The payload and 2-byte
CRC checksum is then XORed with this random
sequence as illustrated in Figure 3-31 . The data is
dewhitened on the receiver side by XORing with the
same random sequence.
Payload whitening/dewhitening is made transparent for
the user, who still provides/retrieves NRZ data to/from
the FIFO.
FIGURE 3-29:
FIGURE 3-30:
MANCHESTER DATA ENCODING
MANCHESTER ENCODING/DECODING
1/BR 1/ ...Sync
BR
Payload...
RF chips @ BR
...
1
1
1
0
1
0
0
1
00
1
0 1 10
1
0
...
User/NRZ bits
Manchester OFF
...
1
1
1
0
1
0
0
1
00
1
0
1
10
1
0
...
t
User/NRZ bits
Manchester ON
...
1
1
1
0
1
0
0
10
01
1
...
DS70622C-page 86
Preliminary
? 2010–2011 Microchip Technology Inc.
相关PDF资料 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MRF89XAM8A-I | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Ultra Low-Power, Integrated ISM Band Sub-GHz Transceiver |
| MRF89XAM8A-I/RM | 功能描述:射频模块 868MHz Sub-GHz transceiver module RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm |
| MRF89XAM8A-I/RM | 制造商:Microchip Technology Inc 功能描述:, Leaded Process Compatible:Yes, Peak Re |
| MRF89XAM9A_12 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:915 MHz Ultra Low-Power Sub-GHz Transceiver Module |
| MRF89XAM9A-I/RM | 功能描述:射频模块 915MHz Sub-GHz Transceiver Mod RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm |
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