TDA5235 Datasheet, PDF (119/259 Pages) Infineon Technologies AG – Enhanced Sensitivity Double-Configuration Receiver with Digital Baseband Processing

TDA5235
Functional Description
The On and Off time setting is different from the Constant On-Off Time Mode. The entire
On time is defined in the SPMONTA0 and SPMONTA1 registers. Regardless of the
numbers of Configurations, 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 Config
run mode
RX polling A
sleep mode
TAON
TMasterPeriod
TOFF
T_MasterPeriod = T_AON + T_OFF
Multi Config
run mode
RX polling ^A
sleep mode
B
TAON
TOFF
TMasterPeriod
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 configurations used, must include enough
time to ensure proper detection of the specified wake-up pattern on all configurations. To
cover the worst case scenario, the maximum time is required on all configurations as in
Constant On-Off.
T_ON must also include the relevant start-up times. In case of the first configuration after
T_OFF, this is the Receiver Start-Up Time. In case of the following Configuration B (RF
Receiver is already on, there is only a change of the configuration), e.g. if Configuration
B is used, this is the Configuration Change Latency Time.
Data Sheet
119
V1.0, 2010-02-19