MC33592FTA Datasheet, PDF (6/28 Pages) Motorola, Inc – PLL Tuned UHF Receiver for Data Transfer Applications

Freescale Semiconductor, Inc.
COMMUNICATION PROTOCOL
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 ´ T_Strobe and in Run mode
during T_Strobe (where T_Strobe 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) ´ T_Strobe.
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
T_Strobe
SR ´ T_Strobe
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
T_Strobe
SR ´ T_Strobe
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
6
MC33592 Technical Data
MOTOROLA
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