tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 114

• Manufacturer Part Number: tda5235
• Description: Enhanced Sensitivity Double-configuration Receiver With Digital Baseband Processing
• Manufacturer: Infineon Technologies Corporation

Figure 80
Calculation of the On time:
The On time must be long enough to ensure proper detection of a specified wake-up
criterion. Therefore the On time depends on the wake-up pattern, and the wake-up
criterion. It has to include transmitter data rate tolerances.
A widely used wake-up pattern is a sequence of equal Bi-phase encoded bits or a certain
Bi-phase encoded bit pattern.
T
T
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. 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
There are other wake-up patterns in use as well, which have several (up to 10 and more)
short wake-up sequences (a few byte each) that are separated by a certain pause (again
a few byte each). In this case the On time has to be set, so that a possible wake-up can
be found within two wake-up sequences including the pause in-between.
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
Data Sheet
RX polling
RX polling
ON
OFF
sleep mode
sleep mode
also must include the relevant start-up times. In case of the first configuration after
, this is the Receiver Start-Up Time. In case of the following Configuration B (RF
run mode
run mode
T
T
AON
A
AON
A
Single Config
Multi Config
Constant On-Off Time
T
BON
B
T
MasterPeriod
T
T
MasterPeriod
OFF
T
OFF
114
T
T
MasterPeriod
MasterPeriod
Functional Description
= T
= T
AON
AON
V1.0, 2010-02-19
+ T
+ T
Time.
TDA5235
OFF
BON
+ T
OFF