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ELM323

ELM
Part Number ELM323
Manufacturer ELM
Description OBD (ISO) to RS232 Interpreter
Published Oct 17, 2005
Detailed Description ELM323 OBD (ISO) to RS232 Interpreter Description Since the 1996 model year, North American automobiles have been requi...
Datasheet PDF File ELM323 PDF File

ELM323
ELM323


Overview
ELM323 OBD (ISO) to RS232 Interpreter Description Since the 1996 model year, North American automobiles have been required to provide an OBD (On Board Diagnostics) data port for the connection of test equipment.
This port is used to obtain emissions-related diagnostics information, and in some cases can also be used to obtain real-time vehicle operating parameters.
The ELM323 is a 14 pin integrated circuit that, with only a few external components, is able to convert between the OBD data format and the standard RS232 serial data format.
This allows virtually any personal computer or PDA to communicate with a vehicle using only a standard serial port and a terminal program.
If desired, hobbyists can even create their own custom ‘scan tool’ by adding an interface program.
Please note that while this integrated circuit has undergone significant changes recently, it is still considered to be an experimenter’s circuit.
It does support a great many of the ISO9141 and ISO14230 (KWP2000) protocol vehicles, but not all of them, due to the many interpretations of these standards that are to be found in use.
Applications • Diagnostic trouble code readers • Automotive scan tools • Teaching aids Features • Low power CMOS design • Crystal controlled for accuracy • ISO 9141-2 and ISO 14230-4 protocols • Configurable with AT commands • Standard ASCII character output • Four high current LED drive outputs Connection Diagram PDIP and SOIC (top view) VDD 1 XT1 2 XT2 3 LFmode 4 RS232Rx 5 RS232Tx 6 RSRx 7 14 VSS 13 OBDK 12 OBDL 11 OBDIn 10 OBDTx 9 OBDRx 8 RSTx Block Diagram LFmode 4 RS232Rx 5 RS232Tx 6 RS232 Interface 3.
58 MHz XT1 2 3 XT2 Timing and Control Interpreter OBD Interface 13 OBDK 12 OBDL 11 OBDIn RSRx 7 RSTx 8 10 OBDTx 9 OBDRx ELM323DSD Elm Electronics – Circuits for the Hobbyist < http://www.
elmelectronics.
com/ > 1 of 19 ELM323 Pin Descriptions VDD (pin 1) This pin is the positive supply pin, and should always be the most positive point in the circuit.
I...



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