SI4438 Datasheet, PDF (21/44 Pages) Silicon Laboratories – Low active power consumption

Si4438
Table 13. Recommended Preamble Length
Mode
(G)FSK
(G)FSK
(G)FSK
(G)FSK
(G)FSK
(G)FSK
OOK
OOK
OOK
AFC
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Disabled
Enabled
Antenna
Diversity
Preamble Type
Disabled
Disabled
Disabled
Enabled
Enabled
Disabled
Disabled
Standard
Standard
Non-standard
Non-standard
Standard
Standard
Standard
Non-standard
Recommended
Preamble Length
Recommended
Preamble Detection
Threshold
4 Bytes
20 bits
5 Bytes
20 bits
2 Bytes
0 bits
Not Supported
7 Bytes
24 bits
8 Bytes
24 bits
4 Bytes
20 bits
2 Bytes
0 bits
Not Supported
Notes:
1. The recommended preamble length and preamble detection thresholds listed above are to achieve 0% PER. They may
be shortened when occasional packet errors are tolerable.
2. All recommended preamble lengths and detection thresholds include AGC and BCR settling times.
3. “Standard” preamble type should be set for an alternating data sequence at the max data rate (…10101010…)
4. “Non-standard” preamble type can be set for any preamble type including …10101010...
5. When preamble detection threshold = 0, sync word needs to be 3 Bytes to avoid false syncs. When only a 2 Byte sync
word is available the sync word detection can be extended by including the last preamble Byte into the RX sync word
setting.
Rev 1.0
21