TDA5225 Datasheet, PDF (44/176 Pages) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

TDA5225
Functional Description
2.5
System Interface
In all applications, the TDA5225 receiver IC is attached to an external microcontroller.
This so-called Application Controller executes a firmware which governs the TDA5225
by reading data from the receiver when data has been received on the RF channel and
by configuring the receiver device. The TDA5225 features an easy to use System
Interface, which is described in this chapter.
The TDA5225 supports the so-called Transparent Mode, which provides a rather
rudimentary interface by which the incoming RF signal is demodulated and the
corresponding data is made available to the Application Controller. The usage of the
Transparent Mode will be described in Chapter 2.5.1.2.
2.5.1 Interfacing to the TDA5225
The TDA5225 is interfacing with an application by three logical interfaces, see
Figure 22. The RF/IF interface handles the reception of RF signals and is responsible
for the demodulation. Its physical implementation has been described in Chapter 2.4.3
and Chapter 2.4.8, respectively. The other two logical interfaces establish the
connection to the Application Controller.
For the sake of clarity, the communication between the TDA5225 and the Application
Controller is split into control flow and data flow. This separation leads to an
independent definition of the data interface and the control interface, respectively.
RF interface
TDA5225
data interface
RX data
configuration
status & alerts
control interface
Application
Controller
(µC)
Figure 22 Logical and electrical System Interfaces of the TDA5225
Data Sheet
44
V1.0, 2010-02-19