tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 115

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

pattern is missed. Therefore the Off time depends mainly on the duration of the expected
wake-up pattern.
For basic timing of WU on RSSI in COO mode, please see
Figure 81
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_WURSSIBH1)
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.
Instead of the single RSSI criterion also the Signal Recognition criterion can be
activated.
Data Sheet
RF signal
RX ON
SLEEP
if (RSSIPWU_value > x_WURSSITH1) and (RSSIPWU_value > x_WURSSIBH1)
if (RSSIPWU_value > x_WURSSITH1) and (RSSIPWU_value < x_WURSSIBL1 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 2.4.8.5 Wake-Up
115
t
ON
Figure
t
n-1
WULOT
Functional Description
n
t
partially
WULOT_part
81.
Generator):
latest decision here !
V1.0, 2010-02-19
window is forced to end by
t
t
last observation time
TDA5235
Figure
end of t
ON
10,