TDA5240 Datasheet, PDF (101/284 Pages) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

TDA5240
Functional Description
The Polling Timer Unit controls the timing for scanning (On time) and sleeping (Off
time, SPM_OFF). Up to four independent configuration sets (A, B, C and D) can
automatically be processed, thus enabling scanning from different transmit sources.
Additionally, up to 3 different frequency channels within each configuration may be
scanned to support Multi-Channel applications. See also Chapter 2.6.2 Polling Timer
Unit. So a total number of up to 12 different frequency channels is supported.
The Wake-Up Generation Unit identifies, whether an incoming data stream matches
the configurable wake-up criterion.
After fulfillment of the wake-up criterion, modulation can be switched automatically.
See also Chapter 2.6.1.6 Automatic Modulation Switching, Chapter 2.4.8.5 Wake-
Up Generator and Chapter 2.5.1.2 Data Interface (in Subsection TMRDS).
The following state diagrams and explanations help to illustrate the behavior during Self
Polling Mode. First there is a search for a wake-up criterion according to Configuration
A on up to three different channels. Then, there is an optional search for a wake-up
criterion according to Configuration B, C and D, again including up to 3 channels.
In applications using only Single-Configuration, settings are always taken from
Configuration A.
Data Sheet
101
V4.0, 2010-02-19