MC33593 Просмотр технического описания (PDF) - Motorola => Freescale
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MC33593 Datasheet PDF : 28 Pages
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Freescale SMeCm33ic59o3nductor, Inc.
The following example shows a complete message with Preamble, ID, Header words followed by 2 data bits,
and an EOM. The preamble is placed at the beginning of both ID and Header words.
Figure 5: Complete message example
11001000
011010
Preamble
ID
Preamble Header Data EOM
MESSAGE PROTOCOL
If the receiver is continuously Sleep/Run cycling, the ID word has to be recognized to stay in Run mode.
Consequently, the transmitted ID burst has to be long enough to include two consecutive receiver Run cycles.
If the Strobe oscillator is enabled (SOE=1), the circuit is in Sleep mode during SR × TStrobe and in Run mode
during TStrobe (where TStrobe is the Strobe oscillator period and SR is the Strobe Ratio, see Table 5). Therefore,
the sleep/run cycle period is equal to (SR+1) × TStrobe.
If SOE=0, these timings constraints must be respected by the external control applied on pin STROBE.
Figure 6: Complete telegram with ID detection
P+ID P+ID P+ID P+ID P+ID P+ID
P+Header Data EOM
RF signal
Run
Sleep
Run
Sleep
TStrobe
SR × TStrobe
ID detected
P+ID = Preamble ID
P+Header = Preamble Header
Figure 7: Complete telegram with tone detection
Tone
Header Data EOM
RF signal
Run
Sleep
Run
Sleep
TStrobe
SR × TStrobe
ID detected
Figures 8 & 9 detail RF signals and the processing done by the receiver in several configuations.
Figure 8: Telegrams with ID
DME=1, HE=1
Preamble ID
Preamble ID
Preamble ID
Preamble Header Data EOM
ID detected
RF signal
Data
DME=1, HE=0
SPI output
Preamble ID ID ID ID ID ID ID ID ID ID ID ID ID ID Data EOM
ID detected
RF signal
ID ID ID ID ID ID ID ID Data
SPI output
© Motorola, Inc., 2002.
FMorOTMOoRrOeLIAnSfoErMmICaOtNioDnUCOTnORTShPisROPDroUdCuTSct,
Go to: www6.freescale.com
revision 7.0, 5 February 2002
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