TDA5230 Datasheet, PDF (98/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

2.4.12 Wake Up Generation Unit
TDA523x
Functional Description
SSync Search Time Elapsed
SSync
WUBCNT
Wakeup Window
Chip Counter
WUW Chip Counter
Elapsed
Chip Data Clock
Chip Data
WUPAT0
WUPAT1
Code Violation Detector
Code Violation Detected
Bit Change Detector
3
16-chips Shift Register
0
2
15
16
Bit Change Detected
Wakeup
Generation
FSM
Pattern Detector
Pattern Detected
WUC
Figure 46 Wake Up Generation Unit
WU
No WU
The Wake Up Generation Unit is used only in the Self Polling Mode for the detection of
a predefined wake up criterion in the received pattern. All SFRs configuring the Wake Up
Generation Unit support the dual configuration capability (Config A and B). The search
for wake up criteria is started if symbol synchronization is given within the duration of four
symbols (RUNIN); otherwise the wake up search is aborted. During the observation
period, the wake up search is aborted immediately if symbol synchronization is lost. If
this is not the case, the wake up search will last for the number of chips defined in the
register WUBCNT.
The Wake Up Window (WUW) Chip Counter counts the number of received chips and
compares this number vs. the number of chips defined in the register WUBCNT.
The Code Violation Detector checks the incoming chip data stream for being manchester
coded. A Code Violation is given if three consecutive chips are ’One’ or ’Zero’
Data Sheet
94
Version 4.0, 2007-06-01