Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

ELM323 Datasheet(PDF) 2 Page - ELM Electronics

Part # ELM323
Description  OBD (ISO) to RS232 Interpreter
Download  19 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  ELM [ELM Electronics]
Direct Link  http://www.elmelectronics.com
Logo ELM - ELM Electronics

ELM323 Datasheet(HTML) 2 Page - ELM Electronics

  ELM323 Datasheet HTML 1Page - ELM Electronics ELM323 Datasheet HTML 2Page - ELM Electronics ELM323 Datasheet HTML 3Page - ELM Electronics ELM323 Datasheet HTML 4Page - ELM Electronics ELM323 Datasheet HTML 5Page - ELM Electronics ELM323 Datasheet HTML 6Page - ELM Electronics ELM323 Datasheet HTML 7Page - ELM Electronics ELM323 Datasheet HTML 8Page - ELM Electronics ELM323 Datasheet HTML 9Page - ELM Electronics Next Button
Zoom Inzoom in Zoom Outzoom out
 2 / 19 page
background image
ELM323
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
Pin Descriptions
2 of 19
All rights reserved. Copyright 2001, 2003 Elm Electronics.
Every effort is made to verify the accuracy of information provided in this document, but no representation or warranty can be
given and no liability assumed by Elm Electronics with respect to the accuracy and/or use of any products or information
described in this document. Elm Electronics will not be responsible for any patent infringements arising from the use of these
products or information, and does not authorize or warrant the use of any Elm Electronics product in life support devices and/or
systems. Elm Electronics reserves the right to make changes to the device(s) described in this document in order to improve
reliability, function, or design.
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
Characteristics section for further information.
XT1 (pin 2) and XT2 (pin 3)
A 3.579545 MHz NTSC television colourburst crystal
is connected between these two pins. Crystal
loading capacitors (typically 27pF) will also normally
be connected between each of these pins and the
circuit common (Vss).
LFmode (pin 4)
This input is used to select the default linefeed mode
after a power-up or system reset. If it is at a high
level, then by default messages sent by the ELM323
will be terminated with both a carriage return and a
linefeed character. If it is at a low level, lines will be
terminated by a carriage return only. This behavior
can always be modified by issuing AT L0 or AT L1
commands (see the section on AT Commands).
RS232Rx (pin5)
A computer’s RS232 transmit signal can be directly
connected to this pin from the RS232 line as long as
a current limiting resistor (typically about 47K
Ω) is
installed in series. (Internal protection diodes will
pass the resistor current safely to the supply
connections, protecting the ELM323.) Internal signal
inversion and Schmitt trigger waveshaping provide
the necessary signal conditioning.
RS232Tx (pin 6)
This is the RS232 transmit or data output pin. The
signal level is compatible with most interface ICs,
and
there
is
sufficient
current
drive
to
allow
interfacing using only a PNP transistor, if desired.
LED Drive Outputs (pins 7, 8, 9, and 10)
These four pins are driven to low levels when the
ELM323 is transmitting or receiving RS232 or OBD
data. Otherwise, they are at a high level. Current
capability is suitable for directly driving most LEDs
through current limiting resistors. If unused, these
pins should be left open-circuited.
OBDIn (pin11)
The OBD data is input to this pin, with a high logic
level representing the active state of the OBD K line.
No Schmitt trigger input is provided, so the OBD
signal should be buffered to minimize transition
times for the internal CMOS circuitry.
OBDL (pin 12) and OBDK (pin 13)
These are the active high output signals which are
used to drive the OBD bus, using external NPN
transistors. Data transfer normally occurs only by the
K line, but the standards require that the L line be
implemented as well in order to properly initialize the
bus. See the Example Applications section for more
details.
VSS (pin 14)
Circuit common is connected to this pin. This is the
most negative point in the circuit.
ELM323DSC
Ordering Information
These integrated circuits are available in either the 300 mil plastic DIP format, or in the 150 mil SOIC surface mount
type of package. To order, add the appropriate suffix to the part number:
300 mil Plastic DIP...................................ELM323P
150 mil SOIC........................................ ELM323SM


Similar Part No. - ELM323

ManufacturerPart #DatasheetDescription
logo
ELM Electronics
ELM323 ELM-ELM323 Datasheet
97Kb / 19P
   OBD (ISO) to RS232 Interpreter
ELM323506A-S ELM-ELM323506A-S Datasheet
816Kb / 4P
   Single P-channel MOSFET
ELM323P ELM-ELM323P Datasheet
97Kb / 19P
   OBD (ISO) to RS232 Interpreter
ELM323SM ELM-ELM323SM Datasheet
97Kb / 19P
   OBD (ISO) to RS232 Interpreter
ELM323 ELM-ELM323_09 Datasheet
97Kb / 19P
   OBD (ISO) to RS232 Interpreter
More results

Similar Description - ELM323

ManufacturerPart #DatasheetDescription
logo
ELM Electronics
ELM323 ELM-ELM323_09 Datasheet
97Kb / 19P
   OBD (ISO) to RS232 Interpreter
ELM327 ELM-ELM327_1 Datasheet
231Kb / 51P
   OBD to RS232 Interpreter
logo
List of Unclassifed Man...
ELM327 ETC1-ELM327 Datasheet
24Kb / 5P
   OBD to RS232 Interpreter
logo
ELM Electronics
ELM327 ELM-ELM327_10 Datasheet
378Kb / 76P
   OBD to RS232 Interpreter
ELM327 ELM-ELM327_13 Datasheet
393Kb / 82P
   OBD to RS232 Interpreter
ELM322 ELM-ELM322 Datasheet
118Kb / 18P
   OBD (VPW) to RS232 Interpreter
ELM322 ELM-ELM322_09 Datasheet
91Kb / 18P
   OBD (VPW) to RS232 Interpreter
ELM320 ELM-ELM320 Datasheet
100Kb / 16P
   OBD (PWM) TO RS232 INTERPRETER
ELM320 ELM-ELM320_09 Datasheet
80Kb / 16P
   OBD (PWM) to RS232 Interpreter
logo
List of Unclassifed Man...
STN1110 ETC1-STN1110 Datasheet
612Kb / 24P
   Multiprotocol OBD to UART Interpreter
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com