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ETAS ES800 System | User Guide
12.8 LIN Interface (LIN)
The LIN interface is electrically isolated from the other interfaces of the module
and also protected against overload or misuse.
12.8.1 Operating Modes
In the application software, the LIN interface can be configured either as LIN mas-
ter or as LIN slave. Switching between both operating modes is controlled by the
software.
12.8.2 Feature
The LIN applications supported by the module are listed in an overview in
chapter 16.9.10 on page 162.
12.8.3 Bus-Based Voltage Supply
The LIN node of the module can optionally be supplied with voltage externally by
the LIN bus or internally by the module. The type of supply must be configured in
the application software.
To maintain the reference level (and thereby equal switching thresholds) at the
individual nodes of the LIN bus, the LIN transceivers (physical layer) of all nodes of
the bus should be operated with the same voltage. It is recommended to switch off
the internal voltage supplies and operate all nodes of the LIN bus with the external
voltage, which also supplies the other bus nodes (LIN_UBATT, see
Fig. 12-4
on page 105).
Fig. 12-4 Voltage supply at the LIN bus
If there is no access or no possibility of using the LIN_UBATT voltage as reference
and supply voltage, the LIN transceivers of the LIN node of the ES88x/ ES89x mod
-
ule must be supplied by a switchable internal voltage source of the module. This
internal supply voltage is not routed outside via the CAN/LIN plug connector. The
module is not designed for the supply of external nodes at the LIN bus.
An internal pull-up resistance can be switched to the LIN interface of the module
as master resistance. Switching in the master resistance of the LIN interface can
be configured in the application software.
LIN_GND
9
3
7
LINLIN_UBATTDSUB-9
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