TLE9221SX Datasheet, PDF (12/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Overview Functional Blocks
BP
BM
Bus
Biasing
R_CM1
Input Filter
Clock Source
Activity
Detection
Differential
Receiver
+
Communication
Controller
-
Interface
R_CM2
Bus Guardian
Interface
uBias
GND
Figure 5 Block diagram of the Receiver
Apart from receiving data, the Receiver is responsible for biasing the FlexRay bus. The biasing of the FlexRay bus
depends on the selected mode of operation.
In BD_Normal mode and BD_ReceiveOnly mode, the voltage uBias is connected to the BP and BM pins across
the common mode resistors R_CM1 and R_CM2. In BD_Sleep mode, BD_Standby mode and in the BD_GoToSleep
command the I/O pins BP and BM are connected to GND via the common mode resistors R_CM1 and R_CM2.
When TLE9221SX is not supplied, the bus biasing is open and is neither switched to uBias nor to GND, the BP
and BM pins appear to the FlexRay bus as a high-impedance input (see Table 3 and Figure 5).
Table 3 Bus biasing
Mode of Operation
BD Normal
BD_ReceiveOnly
BD_Standby
BD_GoToSleep command
BD_Sleep
BD_Off condition
Bus Biasing
uBias
uBias
GND
GND
GND
Open
Transmitter
active or disabled
disabled
disabled
disabled
disabled
disabled
5.3
Communication Controller Interface
The Communication Controller Interface is the interface between the FlexRay transceiver TLE9221SX and the
FlexRay Communication Controller (CC). It comprises three digital signals:
• The TxEN (Transmit Data Enable Not) input pin
• The TxD (Transmit Data) input pin
• The RxD (Receive Data) output pin
Data Sheet
12
Rev. 1.10, 2013-07-15