tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 36

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

reading RSSIPRX, the peak detector will still hold the higher RSSI level. After reading
RSSIPRX the lower RSSI level is loaded into the Peak Detector and can be read by
reading RSSIPRX again.
Register RSSIPRX should not be read-out faster than 41µs in case AGC is ON (as
register value would not represent the actual, but a lower value).
When the RX_RUN signal is inactive, a read access has no influence to the peak
detector value. The register RSSIPRX is reset to 0 at power up reset.
Peak Detector Wake-Up RSSIPWU (see
power during Wake-Up search. The internal signal RSSIPWU gets initialized to 0 at start
of the first observation time window at the beginning of each configuration. The peak
value of this signal is tracked during Wake-Up search.
In case of a Wake-Up, the actual peak value is written in the RSSIPWU register. Even
in case no Wake-Up occurred, actual peak value is written in the RSSIPWU register at
the end of the actual configuration of the Self Polling period. So if no Wake-Up occurred,
then the RSSIPWU register contains the peak value of the last configuration of the Self
Polling period, even in a Multi-Configuration setup. This functionality can be used to track
RSSI during unsuccessful Wake-Up search due to no input signal or due to blocking
RSSI detection.
For further details please refer to
Chapter 2.6.2 Polling Timer
Figure 14
Data Sheet
RSSIPPL&RSSIPRX
RSSIPPL Register
internal RSSIPRX =
RSSIPRX Register
internal RSSIPPL
internal RSSI
internal RSSI
Data Pattern
SPI read out
*1 Computation Delay due to filtering and signal calculation.
Input
Peak Detector Behavior
Noise
Reset
Run-In
FSYNC clears the
internal RSSI P PL
TSI
D0
D1
*1
Unit.
FSync
....
Dn
-1
Dn
n = PKBITPOS
Dn
+1
*1
Chapter 2.4.8.5 Wake-Up Generator
Figure
36
Dn
+2
Dn
+3
10) is used to measure the input signal
SPI
....
EOM
Functional Description
Noise
*1
EOM
Run-In
V1.0, 2010-02-19
TSI
TDA5235
D0 D1
*1
FSync
....
and