tda5251f1 Infineon Technologies Corporation, tda5251f1 Datasheet - Page 69

• Manufacturer Part Number: tda5251f1
• Description: Ask/fsk 315mhz Wireless Transceiver
• Manufacturer: Infineon Technologies Corporation

Confidential
Default values:
ON= 65215 = 1111111011000000
OFF= 62335 = 1111001110000000
t
t
3.9
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.
Figure 3-32
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:
One possible Solution:
t
Preliminary Specification
ON
OFF
- received Signal has code violation as described before
- total mean current consumption below 1mA
- data reception within max. 400ms after first transmitted frame
ON
~10ms @ f
= 15ms, t
~100ms @ f
Example for Self Polling Mode
OFF
RC
Example for transmitted Data-structure
= 135ms
RC
= 32kHz
= 32kHz
4 F ra m es
F ra m e-
deta ils
S ync
b
5 0m s
b
D ata
P re am b le
50m s
S yn cron isation P re am b le
D a ta
69
D ata
4 00 m s
D ata
D a ta
t [m s]
t [m s]
t [m s]
TDA5251 F1
Version 1.0
Application
data_timing011.wmf
2003-02-18