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전자부품 데이터시트 검색엔진 |
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ELM327LP 데이터시트(PDF) 1 Page - ELM Electronics |
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ELM327LP 데이터시트(HTML) 1 Page - ELM Electronics |
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1 / 94 page  ELM327L Elm Electronics – Circuits for the Hobbyist www.elmelectronics.com OBD to RS232 Interpreter The ELM327L is a low voltage version of our popular ELM327 integrated circuit. It supports all of the features of our current ELM327 IC, and only differs physically in how pin 6 is used. The following pages discuss the ELM327L in detail, how to use it and how to configure it, as well as providing some background information on the protocols that are supported. There are also schematic diagrams and tips to help you to interface to microprocessors, construct a basic scan tool, and to use the low power mode. Because of the similarity with the ELM327, much of this data sheet has been copied from the ELM327 data sheet. Throughout this document, we will use the term ‘ELM327’ to refer to either the ELM327 or the ELM327L. If there is something different between the two, we will be specific as to which it applies to. • Works with a 2.0V to 5.5V supply • Universal serial (RS232) interface • Automatically searches for protocols • Fully configurable with AT commands • Low power CMOS design • Diagnostic trouble code readers • Automotive scan tools • Teaching aids Description Applications Block Diagram Features 1 of 94 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 PwrCtrl / Busy IgnMon / RTS MCLR Memory Filter Cap LFmode J1850 Volts XT1 XT2 VSS ISO In PWM In J1850 Bus+ VPW In J1850 Bus- Vmeasure VSS ELM327L DSA 18 17 Command and Protocol Interpreter 6 RS232Tx RS232Rx RS232 Interface 2 ISO 15765-4 SAE J1939 ISO 9141-2 ISO 14230-4 SAE J1850 PWM & VPW 24 23 A/D Converter 15 16 Filter Cap OBD interfaces 1 PwrCtrl / Busy 12 22 21 11 13 4 3 14 4.00 MHz 9 10 XT1 XT2 MCLR Vmeasure IgnMon / RTS 26 27 status LEDs 25 28 Power Control LDO Regulator LFmode 7 5 Memory |
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