ELM329LP Datasheet, PDF (1/87 Pages) ELM Electronics – Fully configurable with AT commands

ELM329L
CAN Interpreter
Description
The ELM329L is a low voltage version of our
popular ELM329 integrated circuit. It supports all of
the features of our current ELM329 IC, and only
differs physically in how pin 6 is used.
The following pages discuss the ELM329L 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 ELM329, much of this data sheet has been
copied from the ELM329 data sheet.
Throughout this document, we will use the term
‘ELM329’ to refer to either the ELM329 or the
ELM329L. If there is something different between
the two, we will be specific as to which it applies to.
Applications
• Diagnostic trouble code readers
• Automotive scan tools
• Teaching aids
Block Diagram
LFmode ⁷
Memory 5
Features
• Works with a 2.0V to 5.5V supply
• Universal serial (RS232) interface
• Fully configurable with AT commands
• Compatible with the popular ELM327
• Low power CMOS design
Connection Diagram
PDIP and SOIC
(top view)
MCLR
Vmeasure
Active LED
Control
Memory
Filter Cap
LFmode
VSS
XT1
XT2
CAN Monitor
In1
In2
PwrCtrl
OBD Tx LED
OBD Rx LED
RS232 Tx LED
RS232 Rx LED
CAN Rx
CAN Tx
M0
M1
VDD
VSS
RS232 Rx
RS232 Tx
PwrCtrl / Busy
IgnMon / RTS
RS232Rx 18
RS232Tx 17
MCLR 1
VDD 20
Filter Cap 6
VSS 8
VSS 19
RS232
Interface
4.00 MHz
9
10
Control
Module
Protocol
Interpreter
11 _{CAN Monitor}
14 _{IgnMon / RTS}
16 _{PwrCtrl / Busy}
15 _PwrCtrl
CAN
Interface
ISO 15765-4
SAE J1939
ISO 11898
I/O
Module
24 _{CAN Rx}
23 _{CAN Tx}
22 _M0
21 _M1
2 Vmeasure
12 _In1
13 _In2
4 _Control
3 25 26 27 28
status LEDs
ELM329L DSA
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