TDA5225 Datasheet, PDF (61/176 Pages) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

TDA5225
Functional Description
TX - RX interaction in RX - Self Polling Mode
TX Telegram:
Wake-up Frame
RUNIN + Wake-up sequence
Wake-up Frame continued or Gap ¹⁾
(RUNIN)
Data Frame
TSI
PAYLOAD
EOM
RX Mode:
On time ²⁾
On time ²⁾
Self Polling Mode ^{Self Polling Mode}
a
b
Run Mode Self Polling
Legend:
1) There can either be a Wake -up Frame directly followed by a Data Frame or the Wake -up Frame is separated from the Data Frame by a Gap in -between .
2) The position of the O n time can vary (a, b, ...) as there is no synchronization between transmitted telegram and start of the receiver’s On time.
Figure 40 SPM - TX-RX Interaction
The transparent data stream can be processed externally by the Application Controller
(see Chapter 2.5.1.2 Data Interface).
Self Polling Mode is entered by setting the MSEL register bit to 1.
Configuration changes are allowed only by switching to SLEEP Mode, and returning to
Self Polling Mode after reconfiguration.
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 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
61
V1.0, 2010-02-19