TDA5235
Functional Description
RSSI Level
x_WURSSIBH1
Exceeding Threshold
Compare
x_WURSSIBL1
x_WURSSITH1
Data
WU Level
Criterion
x_NDCONFIG
x_SIGDET1
Exceeding Threshold(s)
Wake-up on Signal
Recognition
x_NDTHRES
x_SIGDETLO
Sync Search Time Elapsed
Sync
WU
x_WUBCNT
WUW Chip Counter
Elapsed
Wake-up Window
Chip Counter
Wake-up
Generation
FSM
No WU
Code Violation Detected
Bit Change Detected
Code Violation Detector
Bit Change Detector
3
Chip Data Clock
Chip Data
16-chips Shift Register
0
2
15
16
x_WUPAT0
x_WUPAT1
Pattern Detected
Pattern Detector
RSSI
WU on Level Criteria
Signal
Recognition
Sync
Random Bits
Equal Bits
Pattern
Selection
WU on Data Criteria
x_WUC
Figure 23
Wake-Up Generation Unit
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
INFINEON [ Infineon ]
