tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 100

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

2.6.1.4
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
In Self Polling Mode TDA5235 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 TDA5235 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 TDA5235
is given in
Figure 72
Alternatively, a transparent data stream can also be processed externally by the
Application Controller (see
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
TX Telegram:
RX Mode:
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.
Self Polling Mode
On time
Figure
SLEEP Mode
Self Polling Mode (SPM)
RUNIN + Wake-up sequence
SPM - TX-RX Interaction
2)
Wake-up Frame
Self Polling Mode
72.
a
On time
2)
Chapter 2.5.1.2 Data
b
TX - RX interaction in RX - Self Polling Mode
Wake-up Frame continued or Gap
100
Interface).
1)
(RUNIN)
Functional Description
Run Mode Self Polling
TSI
Data Frame
PAYLOAD
V1.0, 2010-02-19
TDA5235
EOM