TDA5252G2 INFINEON [Infineon Technologies AG], TDA5252G2 Datasheet - Page 67

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

Figure 3-30
Example to calculate the thresholds for a given data rate:
- Data signal manchester coded
- Data Rate: 2kbit//s
- f
Then the period equals to
respectively the high time is 0,25ms.
We set the thresholds to +-10% and get: T1= 0,225ms and T2= 0,275ms
The thresholds TH1 and TH2 are calculated with following formulas
This yields the following results:
which have to be programmed into the D0 to D11 bits of the COUNT_TH1 and COUNT_TH2
registers (subaddresses 06H and 07H), respectively.
Default values (window counter inactive):
TH1= 000000000000
TH2= 000000000001
Note: The timing window of +-10% of a given high time T in general does not correspond to a
frequency window +-10% of the calculated data frequency.
3.7.2
The RF input power level is corresponding to a certain RSSI voltage, which can be seen in Section
3.5. The threshold TH3 of this RSSI voltage can be calculated with the following formula:
Data Sheet
clk
= 19.0625 MHz
RSSI threshold voltage - RF input power
Window Counter timing
b
b
TH1~ 1072 = 010000110000
TH2~ 1310 = 010100011110
TH2
TH1
2
⋅
T
=
=
=
T2
2kbit/s
T1
⋅
1
⋅
f
f
clk
4
clk
4
67
=
0,5ms
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b
b
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TDA5252 G2
window_count_timing.wmf
Version 1.1
Application
2007-02-26