TDA5230XT Infineon Technologies, TDA5230XT Datasheet - Page 75

• Manufacturer Part Number: TDA5230XT
• Manufacturer: Infineon Technologies

Specifications of TDA5230XT

• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 4.4mm
• Product Length (mm): 9.7mm
• Lead Free Status / Rohs Status: Compliant

2.4.8.3
As mentioned earlier, RSSI is also sampled by an ADC, delivering an 8-bit resolution. All
four RSSI signals are connected to the differential inputs, and True RSSI with optimal
temperature compensation is automatically generated.
The Chip possesses two digital RSSI peak level detectors. The RSSI level from the ADC
is averaged over four samples before it is sent to the two Peak Detectors. This reduces
the influence of single noise peaks.
Figure 34
Peak Detector 1 is used to measure the input signal power of a received and accepted
data telegram. It is read via SFR RSSI1.
Observation of the RSSI signal starts at the detection of a TSI (FSYNC) and ends with
the detection of EOM. The internal RSSI1 value is cleared after FSYNC. The evaluated
RSSI peak level RSSI1 is transferred to the RSSI1 register at EOM. Starting the
observation of the RSSI level can be delayed by a selectable number of data bits and is
controlled by the register PKBITPOS. A latency in the generation of FSYNC and EOM of
approx. 2..3 bits in relation to the contents of the Peak Detector must be considered.
Within the boundaries described, the register RSSI1 always contains the peak value of
the last completely received data telegram. The register RSSI1 is reset to 0 at power up
reset only.
Data Sheet
Generator
RSSI-
from
RSSI Peak Detector
Clock Generation
ADC Sampling-
A
Peak Detector Unit
f
sys
f
ADC
D
Data-Filter
to
ADCSPLRDIV
Integrate
I&D-Averaging Filter
Divide
RSSI
by 4
Dump
f
ADC/4
71
Peak-Detector 1
Peak-Detector 2
Compare
Compare
Update
Update
Peak-
Value
Peak-
Value
Load
Load
Functional Description
&
Read-Access to Register RSSI2
Version 4.0, 2007-06-01
Peak-Value
Detector
Register
Control
Track-
Update
Peak-
RX-RUN
TDA523x
EOM
FSYNC
PKBITPOS
from
FSM
from
SPI-Controller
RSSI1
RSSI2