User Manual
649
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
LIN Transceiver
Normal Slope Mode
This mode is usually used to transmit and receive messages on the bus. The selected slew rate setting allows
a transmission rate of up to 20 kBaud.
Low Slope Mode
The usage of this mode is linked to a communication with lower baudrate. With this setting the emission of the
transmitter can be reduced. The selected slew rate setting allows a transmission rate of up to 10.4 kBaud.
Fast Slope Mode
In this mode it is also possible to transmit and receive messages on the bus. The selected slew rate setting
allows a transmission rate of up to 40 kBaud.
Flash Mode
In this mode it is possible to transmit and receive messages on the bus. Transmission rates of up to 115 kBaud
are allowed due the internal slew rate control. This mode can be used for EoL programming.
Change of Slope modes
It is not possible to change the slope modes if the module is operating in LIN Normal Mode to avoid
transmission errors. To change the slope mode for example from Normal Slope Mode to Flash Mode, it is
necessary to change to LIN Receive-Only Mode or LIN Sleep Mode, configure the desired slope mode and to go
back to LIN Normal Mode.
20.3.4
LIN Transceiver Status for Mode Selection
The LIN transceiver provides the possibility to monitor the on chip status through internally generated
feedback signals. This provides additional protection functionality for the application to avoid wrong
configuration of the transceiver, which may lead to a blocking of communication on the LIN Bus. The table
below shows the decoding of feedback signals to check the current status of the transceiver.
A Mode Error indicates a problem in the LIN configuration. If that applies, check the LIN software
configuration, and whenever this does not improve the feedback mode it is recommended to enter Sleep
Mode.
Table 340 Decoding of Feedback Signals for LIN Transmitter Mode Settings
LIN_MODE_F
B_<2>
LIN_MODE_FB
<1>
LIN_MODE_F
B<0>
Remarks
0
0
0
Mode Error
0
0
1
LIN Sleep Mode
0
1
0
Mode Error
0
1
1
Mode Error
1
0
0
Mode Error
1
0
1
LIN Receive-Only Mode
1
1
0
Mode Error
1
1
1
LIN Normal Mode