tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 118

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

At the end of the observation time the RSSI peak tracking value of RSSIPWU signal is
compared to the 3 thresholds. Then the decision is made. The algorithmic description is
as follows (see also
Chapter 2.4.8.5 Wake-Up
RSSIPWU_value > x_WURSSIBH1)
Instead of the RSSI criterion also Signal Recognition criterion can be applied. When the
Signal Recognition threshold (x_WURSSIBH1) is not exceeded at Observation Time,
then the system goes back to SLEEP or the Wake-Up on Level FSM (finite state
machine) is initialized and a Wake-up search is performed on the next specified
configuration.
Figure 83
Data Sheet
if (RSSIPWU_value > x_WURSSITH1) and (RSSIPWU_value < x_WURSSIBL1 or
then WU
else NOT
WU on Level Criterion
WU on Data Criterion
UFFB activation
UFFBLCOO
FFB is selected
Random Bits
Recognition
WUCRT (2)
WUCRT (1)
WUCRT (0)
Equal Bits
Pattern
Signal
RSSI
Sync
Figure
Generator):
4
5
3
1
2
0
WUCRT
10,
&
Chapter 2.4.7 RSSI Peak Detector
118
&
WULCUFFB
0
1
&
Functional Description
UFFB criterion
WU criterion
V1.0, 2010-02-19
Generation
Wake-up
TDA5235
FSM
and