UMAX140610. LIN
– J1939 CAN Protocol Converter with PWM Output. Version 1
Page: 20-81
The output is inherently protected against a short/open circuit. In the case of a dead short, or
an open circuit, the hardware will automatically disable the output drive, regardless of what the
processor is commanding for the output. The processor will be flagged by the hardware that
the output circuitry has been shutoff due to a short or an open at the output, but it will not know
which type it is.
For this reason, both types of errors would be identified on the CAN network with the same
Failure Mode Indicator (FMI). Unless commanded OFF by some other logic, when an error
disables the output, the processor will still attempt to drive the output to the desired value.
When the error is removed, the output automatically recovers and resumes normal operation.
See Section 3.9 for the complete description of the diagnostic functions available on this
coverter.
3.3 LIN Interface
The converter LIN interface is defined by
LIN Signal
,
LIN Unconditional Frame
,
Event
Triggered Frame
,
Sporadic Frame
,
Main Schedule Table,
Collision Schedule Table
and
LIN
Common
function blocks.
LIN signals are sent and received through
LIN Signal
function blocks. Other function blocks are
used to define the LIN network communication.
The function blocks will be presented in the order they appear in the EA.
3.3.1 LIN Common
LIN Common
function block does not have any signal inputs and outputs.
Figure 6. LIN Common Function Block
It defines the high-level LIN bus configuration parameters, see the following table.
Table 13. LIN Common Function Block Configuration Parameters
Name
Default
Value
Range
Units
Description
Node Type
Undefined
{Undefined, Master,
Slave}
–
LIN node type. The
“Undefined” value is used
to switch off the node, for
example during debugging.
Baud Rate
19200
[2400…20000]
bit/s
LIN bus baud rate. The
minimum baud rate value is
limited by the converter
transceiver hardware.
Tick Time
10
[1…10000]
ms
Tick time, if Node Type is
“Master”.
LIN Common
