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MC33591FTA bảng dữ liệu(PDF) 6 Page - Motorola, Inc |
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MC33591FTA bảng dữ liệu(HTML) 6 Page - Motorola, Inc |
6 / 28 page COMMUNICATION PROTOCOL 6 MC33591 Technical Data MOTOROLA The Header word is a 4 bit Manchester coded message ‘0110’ or its complement sent at the selected data rate. This bit sequence and its complement must not be found in the sequence preamble and ID word. Data must follow the Header without any delay. Data are completed by a End-of-Message (EOM) word, consisting of 2 NRZ consecutive ones or zeroes. Even in case of FSK modulation, the data must be completed by a EOM and not by simply stopping the RF telegram. If the complement of the Header word is received, output data are complemented too. 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 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 Figure 7: Complete telegram with tone detection Figures 8 & 9 detail RF signals and the processing done by the receiver in several configuations. Preamble 11001000 ID Preamble 01 0 Header 1 1 0 Data EOM P+ID RF signal P+Header Data EOM Run Sleep ID detected Run TStrobe SR ´ TStrobe P+ID P+ID P+ID P+ID P+ID Sleep P+ID = Preamble ID P+Header = Preamble Header RF signal Header Data EOM Tone Run Sleep ID detected Run TStrobe SR ´ TStrobe Sleep Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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Mô tả tương tự - MC33591FTA |
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