tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 50

• Manufacturer Part Number: tda5235
• Description: Enhanced Sensitivity Double-configuration Receiver With Digital Baseband Processing
• Manufacturer: Infineon Technologies Corporation

2.4.8.5
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:
•
•
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
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.
Data Sheet
Wake-up on Level criteria
Wake-up on Data criteria
Wake-Up Generator
50
Chapter
2.6.2.3) for further decreasing the
Functional Description
V1.0, 2010-02-19
TDA5235