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ELM327P Datasheet(PDF) 1 Page - ELM Electronics |
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ELM327P Datasheet(HTML) 1 Page - ELM Electronics |
1 / 51 page ELM327 Elm Electronics – Circuits for the Hobbyist www.elmelectronics.com OBD to RS232 Interpreter Almost all new automobiles produced today are required, by law, to provide an interface from which test equipment can obtain diagnostic information. The data transfer on these interfaces follow several standards, none of which are directly compatible with PCs or PDAs. The ELM327 is designed to act as a bridge between these On-Board Diagnostics (OBD) ports and standard RS232 ports. The ELM327 builds on improved versions of our proven ELM320, ELM322, and ELM323 interfaces by adding seven CAN protocols to them. The result is an IC that can automatically sense and convert the most common protocols in use today. There are a number of other improvements as well – a high speed RS232 option, battery voltage monitoring, and customizable features through programmable parameters, to name only a few. The ELM327 requires few external components to make a fully functioning circuit. The following pages discuss the interface details, and show how to use the IC to ‘talk’ to your vehicle, then concludes with two schematics to get you started. • Supports 12 protocols • Automatically searches for a protocol • Fully configurable with AT commands • RS232 baud rates to 500Kbps • Voltage input for battery monitoring • Low power CMOS design • Diagnostic trouble code readers • Automotive scan tools • Teaching aids Description Applications Block Diagram Features ELM327DSC 1 of 51 Connection Diagram PDIP and SOIC (top view) OBD Tx LED OBD Rx LED RS232 Tx LED RS232 Rx LED CAN Rx CAN Tx ISO L ISO K VDD RS232 Rx RS232 Tx Busy RTS MCLR Memory Baud Rate LFmode J1850 Volts XT1 XT2 VSS ISO In PWM In J1850 Bus+ VPW In J1850 Bus- Vmeasure VSS 4.00 MHz 9 10 XT1 XT2 18 17 Command and Protocol Interpreter 6 RS232Tx RS232Rx LFmode RS232 Interface 2 7 12 24 23 22 21 CAN ISO 15765-4 SAE J1939* ISO 9141-2 ISO 14230-4 SAE J1850 PWM & VPW 11 13 4 3 14 A/D Converter 15 16 Baud Rate 25 28 … 5 Memory status LEDs OBD interfaces 1 Busy MCLR Vmeasure RTS *some support |
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Similar Description - ELM327P |
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