tda5225 Infineon Technologies Corporation, tda5225 Datasheet - Page 69

• Manufacturer Part Number: tda5225
• Description: Enhanced Sensitivity Multi-channel Quad-conf Igurat Ion Receiver With Digital Slicer
• Manufacturer: Infineon Technologies Corporation

Figure 45
Calculation of the On time:
The On time for each channel must be long enough to ensure proper detection of a
specified wake-up criterion. Therefore the On time depends on the wake-up pattern. It
has to include transmitter data rate tolerances.
T
this is the Receiver Start-Up Time. In case of following channels (RF Receiver is already
on, there is only a change of the channel or the configuration), e.g. if Configuration B is
used, this is the Channel Hop Latency Time.
Calculation of the Off time:
The longer the Off time, the lower the average power consumption in Self Polling Mode.
On the other hand, the Off time has to be short enough that no transmitted wake-up
pattern is missed. Therefore the Off time depends mainly on the duration of the expected
wake-up pattern.
If there are further channels scanned, T
On times.
Data Sheet
ON
RX polling
RX polling
RX polling
also must include the relevant start-up times. In case of the first channel after T
sleep mode
sleep mode
sleep mode
run mode
run mode
run mode
T
T
T
A
AON
A
AON
A
AON
1
1
1
Single Channel, Single Config
Multi Channel, Single Config
Multi Channel, Multi Config
Constant On-Off Time
T
T
A
AON
A
AON
2
2
T
T
A
AON
A
AON
3
3
T
MasterPeriod
T
T
T
T
BON
B
1
MasterPeriod
MasterPeriod
OFF
T
BON
B
2
T
OFF
T
OFF
OFF
69
has to be reduced by the related additional
Channels = 1
T
Channels = m
T
Channels Config A = m
Channels Config B = n
T
MasterPeriod
MasterPeriod
MasterPeriod
Functional Description
= T
= m*T
= m*T
AON
AON
AON
+ T
V1.0, 2010-02-19
+ T
+ n*T
OFF
OFF
TDA5225
BON
+ T
OFF
OFF
,