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ELM634

ELM Electronics
Part Number ELM634
Manufacturer ELM Electronics
Description 9600bps miniLIN Monitor
Published Jan 27, 2010
Detailed Description ELM634 9600bps miniLIN Monitor Description LIN or ‘Local Interconnect Network’ is a low cost and relatively simple netw...
Datasheet PDF File ELM634 PDF File

ELM634
ELM634

Overview
ELM634 9600bps miniLIN Monitor Description LIN or ‘Local Interconnect Network’ is a low cost 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/).
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 retransmitting 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.
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.
Applications • LIN logic probes • Diagnostic PC interfaces • Instruction triggered (breakpoint) devices • Educational or training devices Features • Low power CMOS design • 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 Connection Diagram PDIP and SOIC (top view) VDD 1 XT1 2 XT2 3 Rxmode 4 8 VSS 7 LIN 6 RS232Tx 5 RS232Rx Block Diagram RS232Tx 6 RS232Rx 5 Rxmode 4 RS232 Interface 3.
58MHz XT1 2 3 XT2 Timing Formatting and Control LIN Interface 7 LIN ELM634DSB Elm Electronics – Circuits for the Hobbyist < http://www.
elmelectronics.
com/ > 1 of 11 ELM634 Pin Descriptions VDD (pin 1) This pin is the positive supply pin, and should always be the most positive point in the circuit.
Internal circuitry connected to this pin is used to provide power on reset of the microprocessor, so an external reset signal is not required.
Refer to the Electrical Char...


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