TDA5230 Datasheet, PDF (11/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
1.6.2 Baseband Processing
Product Description
TDA523x has integrated all means to process incoming ASK or FSK modulated
Manchester-coded bit streams, and convert them into pure data, which can be read out
via SPI by the host processor.
RF Input
RF Engine:
amplifier, down
converter, filter
Down Converted RF
Manchester Coded
Demodulator
Bit Stream
Manchester ^{Complete Data}
Decoder
Frames
Framer
Payload Data
FIFO
Interrupt,
SPI
Figure 3 Internal Data Processing Flow
The Manchester-coded bit stream is decoded by the Manchester Decoder into a bit
stream containing the wake-up pattern, the TSI (Telegram Start Identifier) and the
payload. The Framer separates the payload and stores it in the FIFO. An interrupt is
generated and data can be read from the FIFO by the host processor via SPI.
1.6.3 Autonomous Self Polling
The TDA523x offers a fully autonomous Self Polling Mode, in which the RF input signal
is scanned for valid data signals base on programmable timing. The host processor is
not burdened with this task, so its full processing power is available for other tasks, or
the host processor may stay in a power save, or sleep mode. When valid data has been
Data Sheet
7
Version 4.0, 2007-06-01