TDA5240 Datasheet, PDF (51/284 Pages) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

TDA5240
Functional Description
RSSI Level
x_WURSSIBHy
x_WURSSIBLy
x_WURSSITHy
Data
x_NDCONFIG
x_SIGDET1
x_NDTHRES
x_SIGDETLO
Compare
Exceeding Threshold
Wake-up on Signal
Recognition
Exceeding Threshold(s)
WU Level
Criterion
Sync Search Time Elapsed
Sync
x_WUBCNT
Chip Data Clock
Chip Data
x_WUPAT0
x_WUPAT1
Wake-up Window
Chip Counter
WUW Chip Counter
Elapsed
Wake-up
Generation
FSM
Code Violation Detector
Code Violation Detected
WU
No WU
Bit Change Detector
3
16-chips Shift Register
0
2
15
16
Bit Change Detected
Pattern Detector
Pattern Detected
Figure 23
WU on Level Criteria
WU on Data Criteria
RSSI
Signal
Recognition
Sync
Random Bits
Equal Bits
Pattern
Wake-Up Generation Unit
Selection
x_WUC
Wake-Up on RSSI
The threshold x_WURSSITHy is used to decide whether the actual signal is a wanted
signal or just noise. Any kind of interfering RSSI level can be blocked by using an RSSI
blocking window. This window is determined by the thresholds x_WURSSIBLy and
Data Sheet
51
V4.0, 2010-02-19