TDA5240 Datasheet, PDF (100/284 Pages) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

TDA5240
Functional Description
2.6.1.4 SLEEP Mode
The SLEEP Mode is a power save mode. The complete RF part is switched off and the
oscillator is in Low Power Mode. As in HOLD Mode, the chip can be reconfigured. When
switching from SLEEP to Run Mode Slave, the state machine starts with the internal
Start-Up Sequence.
2.6.1.5 Self Polling Mode (SPM)
In Self Polling Mode TDA5240 autonomously polls for incoming RF wake-up data
streams. There is no processing load on the host microcontroller. When a wake-up
criterion has been found, an interrupt can be generated and the TDA5240 mode is
changed to Run Mode Self Polling for automatic verification of TSI, optional MIDs and
for transfer of payload data into the FIFO.
A general overview on a typically transmitted protocol and the behaviour of the TDA5240
is given in Figure 72.
TX - RX interaction in RX - Self Polling Mode
TX Telegram:
Wake-up Frame
RUNIN + Wake-up sequence
Wake-up Frame continued or Gap ¹⁾
(RUNIN)
Data Frame
TSI
PAYLOAD
EOM
RX Mode:
On time ²⁾
On time ²⁾
Self Polling Mode ^{Self Polling Mode}
a
b
Run Mode Self Polling
Legend:
1) There can either be a Wake -up Frame directly followed by a Data Frame or the Wake -up Frame is separated from the Data Frame by a Gap in -between .
2) The position of the O n time can vary (a, b, ...) as there is no synchronization between transmitted telegram and start of the receiver’s On time.
Figure 72 SPM - TX-RX Interaction
Alternatively, a transparent data stream can also be processed externally by the
Application Controller (see Chapter 2.5.1.2 Data Interface).
Self Polling Mode is entered by setting the MSEL register bit to 1.
Configuration changes are allowed only by switching to SLEEP Mode, and returning to
Self Polling Mode after reconfiguration.
Data Sheet
100
V4.0, 2010-02-19