tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 109

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

While the TDA5235 is in Run Mode Self Polling, further Wake-ups would normally not be
detected by the receiver. If the functionality of a parallel Wake-up search during the
search for a TSI is desired, this can be activated by the PWUEN bit. In this case the
Wake-up search is not active during a recognized payload and is only active after the
first received payload frame, as can be seen from
used, when modulation type is the same for SPM and RMSP.
So after a reception of the EOM from the current payload, the parallel WU search can
take place in this mode. The WU search will be active after Symbol Sync has been
detected. The WU search will be active until the Synchronization gets lost or wake-up is
generated. After the Synchronization gets lost the WU search will be finished and wake-
up can not be detected any more (the TSI search continues as usual).
Following procedure can be applied with help of 3 SPI Write command sequences.
The idea is to generate external EOM every time the Symbol Sync goes to inactive state
and no interrupt (TSI or WU) has been detected. This will bring the MCU to the cycle start
and reinitialize the WU search.
Configuration:
Write x_WUC.PWUEN = 1
Write x_WURSSITH1 0xFF
Write x_WULOT 0xFF
Data Sheet
// Enable Parallel Wake-up search
// Set RSSI threshold to max value (avoid WU during the reinitialization procedure)
// Set WULOT to max value (avoid WU during the reinitialization procedure)
109
Figure
77. This feature can only be
Functional Description
V1.0, 2010-02-19
TDA5235