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TDA5240 Datasheet(PDF) 50 Page - Infineon Technologies AG |
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TDA5240 Datasheet(HTML) 50 Page - Infineon Technologies AG |
50 / 284 page TDA5240 Functional Description Data Sheet 50 V4.0, 2010-02-19 2.4.8.5 Wake-Up Generator A wake-up generation unit is used only in the Self Polling Mode for the detection of a predefined wake-up criterion in the received pattern. There are two groups of configurable wake-up criteria: • Wake-up on Level criteria • Wake-up on Data criteria The search for the wake-up data criterion is started if data chip synchronization has occurred within the predefined number of symbols, otherwise the wake-up search is aborted. Several different wake-up patterns, like random bit, equal bit, bit pattern or bit synchronization, are programmable. Additional level criterion fulfilment for RSSI or Signal Recognition can lead to a fast wake-up and to a change to Run Mode Self Polling. Whenever one of these Wake-up Level criteria is enabled and exceeds a programmable threshold, a wake-up has been detected. The Wake-up Level criterion can be used very effectively in combination with the Ultrafast Fall Back to SLEEP Mode (see Chapter 2.6.2.3) for further decreasing the needed active time of the autonomous receive mode. A configurable observation time for Wake-up on Level can be set in the x_WULOT register. The Wake-up on Level criterion can be handled very quickly for FSK modulation, while in case of ASK the nature of this modulation type has to be kept in mind. |
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