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PDF ELM633 Data sheet ( Hoja de datos )

Número de pieza ELM633
Descripción 19200bps miniLIN Monitor
Fabricantes ELM Electronics 
Logotipo ELM Electronics Logotipo



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No Preview Available ! ELM633 Hoja de datos, Descripción, Manual

ELM633
19200bps miniLIN Monitor
Description
LIN or ‘Local Interconnect Network’ is a low cost
and relatively simple networking system that is used
predominantly in the automotive world. Recently, it
has been gaining in popularity with proposals to use
it in major appliances as well. For more information,
visit the LIN web site (http://www.lin-subbus.de/).
The ELM633 is a monitoring device designed
for troubleshooting LIN bus systems. It is capable of
continually monitoring a LIN network, translating the
LIN messages to standard ASCII characters, and re-
transmitting them to an RS232 system (personal
computer or PDA) for display and possibly for
analysis. The synchronizing, data formatting, and
checksum calculations are all done for you by the
ELM633.
The LIN specification has recently been updated
to revision 2.0, incorporating several improvements.
The ELM633 has been updated to be compatible
with this new specification, as well as the previous
ones.
Applications
• LIN logic probes
www.DataSheeDt4iaUg.cnoomstic PC interfaces
• Instruction triggered (breakpoint) devices
• Educational or training devices
Features
• Low power CMOS design
• Crystal controlled for accuracy
• Standard ASCII character output
• Special power-on monitor mode
• Permanently set to a 19200bps LIN rate
• High speed (57600 baud) RS232 interface
• Works with LIN1.x and LIN2.0
Connection Diagram
PDIP and SOIC
(top view)
VDD 1
XT1 2
XT2 3
Rxmode 4
8 VSS
7 LIN
6 RS232Tx
5 RS232Rx
Block Diagram
RS232Tx 6
RS232Rx 5
Rxmode 4
RS232
Interface
3.58MHz
XT1 2
3 XT2
Timing
Formatting
and
Control
LIN
Interface
7 LIN
ELM633DSB
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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ELM633 pdf
ELM633
AT Commands (continued)
Remember that they are not case-sensitive, they can
have spaces or tab characters embedded as you wish,
and that for the on/off type commands, the ‘0’
character is the number zero.
BR [ display the Baud Rate ]
This command asks the IC for the LIN baud rate it is
currently operating at. Th ELM633 only supports one
baud rate, so this command will always return with
the response ‘19200’.
MA [ Monitor All ]
This command causes the IC to immediately begin
monitoring the LIN bus for messages, displaying all
that it finds. It can be interrupted at any time by
activity on the RS232 receive input.
D [ set all to Defaults ]
This command resets all of the options to their
default values which were set at the last power-up,
or manual reset command. This usually only affects
the echo and linefeed modes, but if the RS232Rx
pin was at an active level during the last reset, the
IC will immediately enter the Monitor All (AT MA)
mode after this command is issued.
E0 and E1
[ Echo off(0) or on(1) ]
These commands control whether or not characters
received on the RS232 port are re-transmitted (or
echoed) back to the host computer. To reduce traffic
on the RS232 bus, users may wish to turn echoing
off by issuing AT E0. The default is E1 (echo on).
www.DataISheet4U.com
[ Identify yourself ]
Issuing this command causes the chip to identify
itself, by printing the startup product ID string (which
is currently ‘ELM633 v2.0’). Software can use this to
determine exactly which integrated circuit it is talking
to, without resorting to resetting the entire IC.
MR hh
[ Monitor for a Response to hh ]
This is a special version of the AT MA command.
Only identifier/command bytes matching the hex
characters ‘hh’ will be displayed, and all others will be
ignored. This can be useful if trying to track down a
troublesome switch problem, or for triggering another
action on a specific input.
Z [ reset all ]
This combination causes the chip to perform a
complete reset, as if power was cycled off and then
on again. All settings are returned to their default
values, and if the RS232Rx input is not held at an
active level for the entire reset time, the chip will be
put in the idle state, waiting for characters to arrive
on the RS232 bus. Note that the level at the Rxmode
input is measured again at this time, so the RS232Rx
input may be affected if the level at pin 4 has
changed since the initial power-up.
L0 and L1
[ Linefeeds off(0) or on(1) ]
The option of transmitting a linefeed character after
each carriage return character is controlled by these
commands. If an AT L1 is issued, linefeed
generation will be turned on, and for AT L0, it will be
off. Users may wish to have this option on if using a
terminal program, but off if using a custom interface
(as the extra characters serve no real purpose in
such a case). The default setting is L1 (linefeed
characters are sent after every carriage return).
ELM633DSB
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
5 of 11

5 Page





ELM633 arduino
ELM633
Example Applications (continued)
This mode is entered into automatically if the
RS232Rx input is found to be at an active level for the
entire startup time period. This is the period of time
that it takes for the ELM633 to stabilize on a power-up
or reset, prior to issuing the first ‘ELM633 v2.0’
message. Since pin 4 is shown connected high, if pin 5
is held low for at least the initial period, the device will
immediately enter the AT MA mode, as if a user had
sent the command. This is convenient if one wants to
monitor all LIN bus data, but does not particularly want
to manually have to initiate the monitoring. This would
be useful if making a ‘smart’ adapter cable, for
example. Circuit power is from three button cells,
which provide 4.5V to the circuit through a momentary
action pushbutton switch. The 4.5V is at the lower
level of recommended voltages, but is still within
specified limits, so works fine.
These examples have hopefully provided enough
information to get you started with LIN devices. The
LIN standard shows considerable promise for low-cost
circuits that can be used in lower speed networks such
as for man-machine interfaces. While they are
relatively new and not too frequently found at this time,
they are beginning to turn up everywhere…
LIN
Interface
LIN Data
Signal
Ground
www.DataSheet4U.com
+4.5V
22K
10K
4.7K
0.01µF
10K
8765
633
1234
3.58MHz
27pF
27pF
RS232
Interface
4.7K
2 (RxD)
3 (TxD)
5 (SG)
Figure 4. LIN Logic Probe
ELM633DSB
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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