TDA5235 Datasheet, PDF (106/259 Pages) Infineon Technologies AG – Enhanced Sensitivity Double-Configuration Receiver with Digital Baseband Processing

TDA5235
Functional Description
With interfering signal (interferer signal has same data rate as wanted wake-up signal):
WU frame and Payload frame have the same modulation type
e.g. TOTIM_TSI is set to 15ms
TX interferer
TX signal
RX_RUN
Wake-up
RI TSI Payload1
WU-data Interrupt
RunMode SelfPolling
SelfPolling / Sleep
*)
Init TOTIMs
TOTIM_SYNC
counter activity
TOTIM_TSI
counter activity
15ms
TOTIM_EOM
counter activity
*) Chip proceeds with Self Polling Mode
Figure 76 TOTIM Behavior in Presence of Interferer
RI TSI Payload2
On expiring of one of the timeout timers, the receiver proceeds with Self Polling Mode
and with searching for a suitable wake-up criterion on the next configuration or a search
for a wake-up criterion in Configuration A is initiated.
As long as the chip is in Run Mode Self Polling, incoming data frames (including a
RUNIN sequence and TSI, but without necessity of additional wake-up patterns) can be
received and stored.
The data FIFO can be initialized and cleared either at
• Cycle Start, that means whenever Run Mode Self Polling is entered or
• Frame Start, when a TSI has been successfully identified (and Receive FIFO is not
locked).
Further information about the Receive FIFO can be found in the Chapter 2.5.2 Receive
FIFO.
After an EOM was found, the information about the RF channel and the configuration of
the actual payload data is saved in the RFPLLACC register.
Data Sheet
106
V1.0, 2010-02-19