ELM634
9600bps miniLIN Monitor
Description
Features
LIN or ‘Local Interconnect Network’ is a low cost
• Low power CMOS design
and relatively simple networking system that is used
predominantly in the automotive world. Recently, it
has been gaining in popularity with proposals to use
it in major appliances as well. For more information,
visit the LIN web site (http://www.lin-subbus.de/).
• Crystal controlled for accuracy
• Standard ASCII character output
• Special power-on monitor mode
• Permanently set to a 9600bps LIN rate
• High speed (57600 baud) RS232 interface
• Works with LIN1.x and LIN2.0
The ELM634 is a monitoring device designed
for troubleshooting LIN bus systems. It is capable of
continually monitoring a LIN network, translating the
LIN messages to standard ASCII characters, and re-
transmitting them to an RS232 system (personal
computer or PDA) for display and possibly for
analysis. The synchronizing, data formatting, and
checksum calculations are all done for you by the
ELM634.
Connection Diagram
PDIP and SOIC
(top view)
The LIN specification has recently been updated
to revision 2.0, incorporating several improvements.
The ELM634 has been updated to be compatible
with this new specification, as well as the previous
ones.
1
2
3
4
8
7
6
5
VDD
XT1
VSS
LIN
Applications
XT2
RS232Tx
RS232Rx
Rxmode
• LIN logic probes
• Diagnostic PC interfaces
• Instruction triggered (breakpoint) devices
• Educational or training devices
3.58MHz
Block Diagram
2
3
XT1
XT2
Timing
6
RS232Tx
RS232
Interface
LIN
Interface
7
LIN
Formatting
and
5
RS232Rx
Control
4
Rxmode
ELM634DSB
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