tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 51

• Manufacturer Part Number: tda5235
• Description: Enhanced Sensitivity Double-configuration Receiver With Digital Baseband Processing
• Manufacturer: Infineon Technologies Corporation

Figure 23
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
Chip Data Clock
Chip Data
Sync Search Time Elapsed
RSSI Level
Data
Sync
x_WURSSIBH1
x_WURSSIBL1
x_WURSSITH1
Wake-Up Generation Unit
x_NDCONFIG
x_SIGDETLO
x_NDTHRES
x_WUBCNT
x_SIGDET1
x_WUPAT0
x_WUPAT1
Wake-up on Signal
Recognition
Compare
WU on Level Criteria
WU on Data Criteria
0
3
16-chips Shift Register
2
Exceeding Threshold (s)
Wake-up Window
Exceeding Threshold
Code Violation Detector
Pattern Detector
Chip Counter
Bit Change Detector
16
Random Bits
Recognition
Equal Bits
51
Pattern
Signal
RSSI
Sync
15
x_WUC
Code Violation Detected
Bit Change Detected
WUW Chip Counter
Pattern Detected
Elapsed
WU Level
Criterion
Selection
Generation
Wake-up
FSM
Functional Description
No WU
WU
V1.0, 2010-02-19
TDA5235