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20
DATA
2
XOSC
28
DATA
DRATE _ E
XOSC
R
2
DRATE _ E
log
f
R
2
DRATE _ M
256
f
2
é
ù
æ
ö
´
ê
ú
ç
÷
=
ç
÷
ê
ú
è
ø
ë
û
´
=
-
´
SWRS037B – JANUARY 2006 – REVISED MARCH 2015
The following approach shown in
can be used to find suitable values for a given data rate.
(2)
If DRATE_M is rounded to the nearest integer and becomes 256, increment DRATE_E and use
DRATE_M=0.
The data rate can be set from 0.8 kBaud to 500 kBaud with the minimum data rate step size changes
according to
.
Table 5-4. Data Rate Step Size
MIN DATA RATE
TYPICAL DATA RATE
MAX DATA RATE
DATA RATE STEP SIZE
[kBaud]
[kBaud]
[kBaud]
[kBaud]
0.8
1.2 / 2.4
3.17
0.0062
3.17
4.8
6.35
0.0124
6.35
9.6
12.7
0.0248
12.7
19.6
25.4
0.0496
25.4
38.4
50.8
0.0992
50.8
76.8
101.6
0.1984
101.6
153.6
203.1
0.3967
203.1
250
406.3
0.7935
406.3
500
500
1.5869
5.8
Packet Handling Hardware Support
The CC1150 has built-in hardware support for packet oriented radio protocols.
In transmit mode, the packet handler can be configured to add the following elements to the packet stored
in the TX FIFO:
•
A programmable number of preamble bytes.
•
A two byte Synchronization Word. Can be duplicated to give a 4-byte sync word (recommended). It is
not possible to only insert preamble or only insert a sync word.
•
Optionally whitening the data with a PN9 sequence.
•
Optionally Interleave and Forward Error Code the data.
•
Optionally compute and add a 2-byte CRC checksum over the data field.
In a system where CC1150 is used as the transmitter and CC1101 as the receiver the recommended
setting is 4-byte preamble and 4-byte sync word except for 500 kBaud data rate where the recommended
preamble length is 8 bytes.
NOTE
Register fields that control the packet handling features should only be altered when CC1150
is in the IDLE state.
5.8.1
Data Whitening
From a radio perspective, the ideal over the air data are random and DC free. This results in the
smoothest power distribution over the occupied bandwidth. This also gives the regulation loops in the
receiver uniform operation conditions (no data dependencies).
Copyright © 2006–2015, Texas Instruments Incorporated
Detailed Description
19
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