TDA5235
Functional Description
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 Figure 10, Chapter 2.4.7 RSSI Peak Detector and
Chapter 2.4.8.5 Wake-Up Generator):
if (RSSIPWU_value > x_WURSSITH1) and (RSSIPWU_value < x_WURSSIBL1 or
RSSIPWU_value > x_WURSSIBH1)
then WU
else NOT
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.
WULCUFFB
0
UFFB criterion
&
1
RSSI
4
WU on Level Criterion
Signal
5
3
1
2
0
Recognition
Sync
WU criterion
Random Bits
Equal Bits
Pattern
WU on Data Criterion
Wake-up
Generation
FSM
WUCRT
WUCRT (2)
WUCRT (1)
WUCRT (0)
&
&
UFFBLCOO
FFB is selected
Figure 83
UFFB activation
Data Sheet
118
V1.0, 2010-02-19
INFINEON [ Infineon ]
