TDA5230 Datasheet, PDF (57/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Functional Description
The Wake Up Time includes Receiver Start Up Time for the first channel scanned, or
Channel Hop Latency for the following channels plus 7.625 bits (The 7.625 bits are
required for synchronisation and Data Framer Latency) and Wake Up Criterion length at
minimal Data Rate.
T_{WakeUp_ConfigAChannel1}=0.576 ms+(7.625 bits+10 bits)/(10kb/s*0.9)=2.55 ms
T_{WakeUp_ConfigAChannel2}=0.06 ms+(7.625 bits+10 bits)/(10kb/s*0.9)=2.02 ms
T_{WakeUp_ConfigAChannel3}=0.06 ms+(7.625 bits+10 bits)/(10kb/s*0.9)=2.02 ms
T_{WakeUp_ConfigBChannel1}=0.06 ms+(7.625 bits+10 bits)/(5kb/s*0.9)=3.98 ms
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
Note: In many transmit frame descriptions the Wake Up Pattern is terminated by a single
bit for synchronisation. In this case, the Wake Up Pattern has to be reduced by the
number of bits (or chips) used for TSI (See Chapter 2.4.13 Frame Synchronization).
The usable Wake Up Pattern Time is the Wake Up Pattern Time reduced by the longest
Wake Up Time of a channel in the related configuration. This is T_{WakeUp_ConfigAChannel1} for
Configuration A, and for Configuration B the scanning of both channels requires the
same time.
T_{usable_Wakeup_PatternA}=T_{Wakeup_PatternA}-T_{WakeUp_ConfigAChannel1}=181.81ms-2.55ms=179.26ms
T_{usable_Wakeup_PatternB}=T_{Wakeup_PatternB}-T_{WakeUp_ConfigBChannel1}=363.62ms-3.98ms=359.64ms
3) Calculation of the Master Period Time
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}=179.26ms
Calculation of the On Time
In Constant On/Off Time Wake Up Mode, the On Time limits the search for a Wake Up
Criterion for each channel in both configurations. There is an independent On Time for
Configuration A channels, and a ON Time for Configuration B channels. The On Time in
each configuration has to be longer than the longest Wake Up Time in this configuration.
T_{ON_ConfigA}>T_{WakeUp_ConfigAChannel1}=2.55ms
T_{ON_ConfigB}>T_{WakeUp_ConfigBChannel1}=3.98ms
Data Sheet
53
Version 4.0, 2007-06-01