tda5225 Infineon Technologies Corporation, tda5225 Datasheet - Page 61

• Manufacturer Part Number: tda5225
• Description: Enhanced Sensitivity Multi-channel Quad-conf Igurat Ion Receiver With Digital Slicer
• Manufacturer: Infineon Technologies Corporation

Figure 40
The transparent data stream can be processed externally by the Application Controller
(see
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
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
Interface
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
TX Telegram:
RX Mode:
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.
Chapter 2.5.1.2 Data
Self Polling Mode
Chapter 2.6.1.6 Automatic Modulation Switching
(in Subsection TMRDS).
On time
RUNIN + Wake-up sequence
SPM - TX-RX Interaction
2)
Wake-up Frame
Self Polling Mode
a
On time
2)
Interface).
b
TX - RX interaction in RX - Self Polling Mode
Wake-up Frame continued or Gap
61
1)
Chapter 2.6.2 Polling Timer
(RUNIN)
and
Functional Description
Run Mode Self Polling
TSI
Chapter 2.5.1.2 Data
Data Frame
PAYLOAD
V1.0, 2010-02-19
TDA5225
EOM