TDA5230 Datasheet, PDF (62/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Functional Description
T_{WakeUp_ConfigBChannel2}=0.06 ms+(7.625 bits+10 bits)/(5kb/s*0.9)=3.98 ms
2) Calculation of usable Wake Up Pattern Time:
The Wake Up Pattern time is the minimal duration of wake up patterns.
T_{Wakeup_PatternA}=Wake Up Pattern/(Data Rate*tolerance)=2000/(10 kb/s*1.1)=181.81 ms
T_{Wakeup_PatternB}=2000/(10 kb/s*1.1)=363.62ms
T_{usable_Wakeup_PatternA}=T_{Wakeup_PatternA}-T_{WakeUp_ConfigAChannel1}=181.81ms-2.55ms=179.26 ms
T_{usable_Wakeup_PatternB}=T_{Wakeup_PatternB}-T_{WakeUp_ConfigBChannel1}=363.62ms-3.98ms=359.64 ms
3) Calculation of the Master Period
T_MasterPeriod is smaller then T_{usable_Wakeup_PatternA} or T_{usable_Wakeup_PatternB} whichever is
shorter. In our example:
T_MasterPeriod<T_{usable_Wakeup_PatternA}=179.26 ms
Calculation of the On Time
In Mixed Wake Up Mode, the On Time for Configuration A limits the search for a Wake
Up Criteria for each used channel in Configuration A. The On Time for Configuration B
limits the Wake Up search for all used channels in Configuration B. Therefore the On
Time is the sum of On Time for all used channels and configurations.
T_{ON_ConfigA}>T_{WakeUp_ConfigAChannel1}=2.55ms
T_{ON_ConfigB}>T_{WakeUp_ConfigBChannel1..2}=3.98 ms +3.98 ms =7.96 ms
Calculation of the Off Time
The Off Time is the Master Period minus the sum of On Times for Configuration A and
the On Time for Configuration B.
T_OFF=T_MasterPeriod-3*T_{ON_ConfigA}-T_{ON_ConfigB}=179.26 ms-3*2.55 ms-7.96 ms=163.65 ms
Note: Use the TDA523x IAF Configuration Tool to translate the calculated values into
register settings. Enter On and Off Time as calculated. Watch the Master Period and
vary Off Time till the resulting Master Period is shorter than the result of the calculation.
Take care that T_ON must be always longer and T_MasterPeriod always shorter than the
calculated values!
2.4.6.5 Permanent Wake Up Search
When the SFR control bit PERMWUSEN is set and the Self Polling Mode is set to
Constant On/Off, the receiver will work in Fast Fall Back Mode but it will not go back to
the sleep state after the last channel has been searched. Instead, it will start again from
Data Sheet
58
Version 4.0, 2007-06-01