TDA5240 Datasheet, PDF (119/284 Pages) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

TDA5240
Functional Description
numbers of RF channels and whether or not Multi- or Single-Configuration is used, the
On time is defined with the Configuration A On-Timer. The deactivation of the receiver
can happen at different times, but this event does not influence the timer stage, because
the On time is still the same. So the master period is constant. The following scenarios
are the same as before, but with Fast Fall Back to SLEEP.
Only the following receive modes (see Chapter 2.5.1.2 Data Interface) can be used:
• Packet Oriented FIFO Mode (POF)
• Packet Oriented Transparent Payload Mode (POTP)
• Transparent Mode - Chip Data and Strobe (TMCDS)
Single Channel, Single Config
run mode
RX polling
A
1
sleep mode
TAON
TMasterPeriod
TOFF
Channels = 1
T_MasterPeriod = T_AON + T_OFF
Multi Channel, Single Config
run mode
RX polling
A
1
A
2
A
3
sleep mode
TAON
TOFF
TMasterPeriod
Channels = m
T_MasterPeriod = T_AON + T_OFF
Multi Channel, Multi Config
run mode
RX polling
A
1
A
2
AB
31
B
2
sleep mode
TAON
TOFF
TMasterPeriod
Channels Config A = m
Channels Config B = n
T_MasterPeriod = T_AON + T_OFF
Figure 84 Fast Fall Back to SLEEP
Calculation of the On time:
The On time, which is now a sum for all of the channels and configurations used, must
include enough time to ensure proper detection of the specified wake-up pattern on all
channels. To cover the worst case scenario, the maximum time is required on all
channels as in Constant On-Off.
T_ON must also include the relevant start-up times. In case of the first channel after T_OFF,
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.
In addition, it has to be considered that some data bits are required for synchronization
and internal latency (see Chapter 2.4.8.8 RUNIN, Synchronization Search Time and
Inter-Frame Time).
Data Sheet
119
V4.0, 2010-02-19