SX1231-31SKB433 Semtech, SX1231-31SKB433 Datasheet - Page 59
SX1231-31SKB433
Manufacturer Part Number
SX1231-31SKB433
Description
USB Kit - SX1231 433Mhz
Manufacturer
Semtech
Datasheet
1.SX1231-31SKB433.pdf
(84 pages)
- Current page: 59 of 84
- Download datasheet (2Mb)
SX1231
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
5.5.8.2. Data Whitening
Another technique called 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 de-whitened on the Rx side using the same sequence.
Comparing to Manchester technique it has the advantage of keeping NRZ data rate i.e. actual bit rate is not halved.
The whitening/de-whitening process is enabled if DcFree = 10. A 9-bit LFSR is used to generate a random sequence. The
payload and 2-byte CRC checksum is then XORed with this random sequence as shown below. The data is de-whitened
on the receiver side by XORing with the same random sequence.
Payload whitening/de-whitening is thus made transparent for the user, who still provides/retrieves NRZ data to/from the
FIFO.
9
5
L F S R P o ly n o m ia l = X
+ X
+ 1
X
8
X
7
X
6
X
5
X
4
X
3
X
2
X
1
X
0
W hite ne d d ata
T ran sm it d ata
Figure 36. Data Whitening
Rev 4 - Nov 2010
Page 59
www.semtech.com
Related parts for SX1231-31SKB433
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
TVS
Manufacturer:
Semtech
Datasheet:
Part Number:
Description:
development tool usb kit for sx1231 transceiver...
Manufacturer:
Semtech
Datasheet:
Part Number:
Description:
Low Power Integrated UHF Transceiver
Manufacturer:
SEMTECH [Semtech Corporation]
Datasheet:
Part Number:
Description:
EVALUATION BOARD
Manufacturer:
Semtech
Datasheet:
Part Number:
Description:
EVALUATION BOARD
Manufacturer:
Semtech
Datasheet:
Part Number:
Description:
VOLTAGE SUPPRESSOR, TRANSIENT SEMTECH
Manufacturer:
Semtech
Datasheet:
Part Number:
Description:
HIGH VOLTAGE CAPACITORS MONOLITHIC CERAMIC TYPE
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
EZ1084CM5.0 AMP POSITIVE VOLTAGE REGULATOR
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
3.0 AMP LOW DROPOUT POSITIVE VOLTAGE REGULATORS
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
RailClamp Low Capacitance TVS Diode Array
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet: