TDA5235 Datasheet, PDF (51/259 Pages) Infineon Technologies AG – Enhanced Sensitivity Double-Configuration Receiver with Digital Baseband Processing

TDA5235
Functional Description
RSSI Level
x_WURSSIBH1
x_WURSSIBL1
x_WURSSITH1
Data
x_NDCONFIG
x_SIGDET1
x_NDTHRES
x_SIGDETLO
Compare
Exceeding Threshold
Wake-up on Signal Exceeding Threshold(s)
Recognition
WU Level
Criterion
Sync Search Time Elapsed
Sync
x_WUBCNT
Chip Data Clock
Chip Data
x_WUPAT0
x_WUPAT1
WU
Wake-up Window
Chip Counter
WUW Chip Counter
Elapsed
Wake-up
Generation
FSM
Code Violation Detector ^{Code Violation Detected}
No WU
Bit Change Detector
3
Bit Change Detected
16-chips Shift Register
0
2
15
16
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_WURSSITH1 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_WURSSIBL1 and
Data Sheet
51
V1.0, 2010-02-19