TDA5252G2 INFINEON [Infineon Technologies AG], TDA5252G2 Datasheet - Page 66

• Manufacturer Part Number: TDA5252G2
• Description: ASK/FSK 915MHz Wireless Transceiver
• Manufacturer: INFINEON [Infineon Technologies AG]

Note 1: Chip internal signal „Sequencer enables data detection“ has a LOW to HIGH transition
about 2.6ms after RX is activated (see Figure 2-15).
Note 2: The positive edge of the „Window Count Complete“ signal latches the result of comparison
of the analog to digital converted RSSI voltage with TH3 (register 08H). A logic combination of this
output and the result of the comparison with single/double TH x defines the internal signal
„data_valid“.
Figure 3-27 shows that the logic is ready for the next conversion after 3 periods of the data signal.
Timing in Single Shot mode can be seen in the subsequent figure:
Figure 3-29
3.7.1
The high time of data is used to measure the frequency of the data signal. For Manchester coding
either the data frequency or half of the data frequency have to be detected corresponding to one
high time or twice the high time of data signal.
A time period of 3*2*T is necessary to decide about valid or invalid data.
Data Sheet
Frequency Window for Data Rate Detection
Frequency Detection timing in Single Shot mode
Compare with double
(Frequency) Window
Compare with single
Sequenzer enables
TH and latch result
TH and latch result
Count Complete
Counter Reset
data detection
Gate time
Data
possible
possible
GATE 1
GATE 2
start of conversion
DATA
reset
0
0
T2
T1
T
no possible start of next conversion
count
0
0
because of Single Shot Mode
2*T2
2*T1
2*T
66
comp.
1
1
comp.
ready*
0
t
t
t
t
t
t
t
t
t
t
Frequ_Detect_Timing_singleShot_wmf
TDA5252 G2
Version 1.1
Application
2007-02-26