TDA5235 Datasheet, PDF (107/259 Pages) Infineon Technologies AG – Enhanced Sensitivity Double-Configuration Receiver with Digital Baseband Processing

TDA5235
Functional Description
After detection of EOM the TDA5235 can either proceed with a search for a wake-up
criterion in the next configuration or a search for wake-up in Configuration A can follow
or the TOTIMs of the current configuration are reloaded for being prepared to receive
another (redundant) payload data frame within the same configuration.
Alternatively, a transparent data stream can also be processed externally by the
Application Controller. Therefore the external controller needs the possibility to send
following commands, which would normally be generated by the TDA5235 itself (see
Figure 77 and EXTPCMD register as well):
• EXTTOTIM: So the TDA5235 can proceed with Self Polling Mode (either with the
next configuration or with Configuration A).
• EXTEOM found: In this case the TDA5235 can either proceed with Self Polling Mode
(either with the next configuration or with Configuration A) or stay in Run Mode Self
Polling.
EXTTOTIM and EXTEOM are only available, when the external processing mode is
deactivating functional blocks (see bit group x_CHCFG.EXTPROC).
When the actual processed configuration is right before the Off time and the Application
Controller sends one of the above mentioned commands, then the TDA5235 can
proceed with the Off time (in case next configuration is selected).
If the autonomous Wake-up Search with Configuration A follows a TOTIM or EOM event,
then also the Polling Timer is initialized, this means a new On period is started. In case
the Wake-up Search gets started with Next Configuration (after a TOTIM or EOM event),
then the Polling Timer is not initialized. This means that the On time counter proceeds
with the old value from leaving the previous Wake-up search period successfully. This is
the case for Fast Fall Back to SLEEP Mode.
In Constant On-Off Time Mode the Polling Timer is always initialized after a TOTIM or
EOM event.
Data Sheet
107
V1.0, 2010-02-19