TDA5250D2_07 Datasheet, PDF (72/94 Pages) Infineon Technologies AG – ASK/FSK 868MHz Wireless Transceiver

TDA5250 D2
Version 1.7
Application
Default values:
ON= 65215 = 1111111011000000_b
OFF= 62335 = 1111001110000000_b
t_ON ~10ms @ f_RC= 32kHz
t_OFF ~100ms @ f_RC= 32kHz
3.9
Example for Self Polling Mode
The settings for Self Polling Mode depend very much on the timing of the transmitted Signal. To
create an example we consider following data structure transmitted in FSK.
4 Frames
Data
Data
Data
50ms 50ms
400ms
Data
t [ms]
Frame-
details
Preamble
Data
t [ms]
Sync
Syncronisation Preamble
t [ms]
data_timing011.wmf
Figure 3-34 Example for transmitted Data-structure
According to existing synchronization techniques there are some synchronization bursts in front of
the data added (code violation!). A minimum of 4 Frames is transmitted. Data are preferably
Manchester encoded to get fastest respond out of the Data Rate Detection.
Target Application:
- received Signal has code violation as described before
- total mean current consumption below 1mA
- data reception within max. 400ms after first transmitted frame
One possible Solution:
t_ON = 15ms, t_OFF= 135ms
Data Sheet
72
2007-02-26