tda5225 Infineon Technologies Corporation, tda5225 Datasheet - Page 70

• Manufacturer Part Number: tda5225
• Description: Enhanced Sensitivity Multi-channel Quad-conf Igurat Ion Receiver With Digital Slicer
• Manufacturer: Infineon Technologies Corporation

For basic timing of WU on RSSI in COO mode, please see
Figure 46
Always check at the end of the current observation time window, if there is a WU (Wake-
Up) event or NOT. This means, in algorithmic description (see also
Chapter 2.4.7 RSSI Peak Detector
Here, ‘NOT‘ means to keep on evaluating and move on to the next observation time
window, also keep on peak value tracking of RSSIPWU signal. Keep on walking through
the observation time windows until there is a WU event from the algorithm above or
finally decide at the end of the On time with the following algorithm:
RSSIPWU_value > x_WURSSIBHy)
If there is a WU event at the end of an observation time window while walking through
the observation time windows, freeze/hold this decision/peak value in register RSSIPWU
for optional read out and switch to run mode self polling.
Data Sheet
RF signal
if (RSSIPWU_value > x_WURSSITHy) and (RSSIPWU_value > x_WURSSIBHy)
RX ON
SLEEP
if (RSSIPWU_value > x_WURSSITHy) and (RSSIPWU_value < x_WURSSIBLy or
then WU
else NOT
then WU
else NOT
e.g . ASK
COO Polling in WU on RSSI Mode
t
Startup
t
WULOT
1
t
WULOT
2
and
Chapter 2.4.8.2 Wake-Up
70
t
ON
Figure
t
n-1
WULOT
Functional Description
n
t
partially
WULOT_part
46.
Generator):
latest decision here !
V1.0, 2010-02-19
window is forced to end by
t
t
last observation time
TDA5225
Figure
end of t
ON
10,