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ELM630 Schematic ( PDF Datasheet ) - ELM Electronics

Teilenummer ELM630
Beschreibung LIN Monitor
Hersteller ELM Electronics
Logo ELM Electronics Logo 




Gesamt 12 Seiten
ELM630 Datasheet, Funktion
ELM630
LIN 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 ELM630 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 analysis.
The baud rate measurements, data formatting,
synchronizing, and checksum calculations are all
done for you by the ELM630.
The LIN specification has recently been updated
to revision 2.0, incorporating several improvements.
The ELM630 has been updated to be compatible
with this new specification, as well as the previous
ones.
Applications
• LIN logic probes
• Diagnostic PC interfaces
www.DataSheInest4tUru.ccotmion 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
• Autobaud from 1200bps to 19200bps
• 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
RS232Rx 5
LFmode 6
RS232Tx 7
14 VSS
13 LIN
12 MTime
11 Monitor
10 b0
Baud
9 b1 Rate*
8 b2
*see Table 1 on Page 3
Block Diagram
Rxmode 4
RS232Rx 5
RS232Tx 7
RS232
Interface
6
LFmode
3.58MHz
XT1 2
3 XT2
Timing
Formatting
and
Control
LIN
Interface
11 12
Monitor MTime
8 9 10
b2 b1 b0
13 LIN
ELM630DSB
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
1 of 12






ELM630 Datasheet, Funktion
ELM630
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 that
it is currently operating at. If the IC is set for auto
and no rate has yet been determined, the reply will
be ‘AUTO’. Otherwise, it will be one of the allowed
rates (1200, 2400, 4800, 9600 or 19200).
D [ set all to Defaults ]
This command resets all of the options to their
default values as are set after a power-up, or
manual reset command. This includes the baud rate,
echo, linefeed, and the measurement period. Note
that if the Monitor pin was at a high level during
power-up, 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).
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I [ Identify yourself ]
Issuing this command causes the chip to identify
itself, by printing the startup product ID string (this is
currently ‘ELM630 v2.0’). Software can use this to
determine exactly which integrated circuit it is talking
to, without resorting to resetting the entire IC.
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 AT L1 is issued, linefeed generation
will be turned on, and AT L0 will turn it 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 that case).
The default setting is determined by the logic level at
the LFmode pin on powerup or reset: if it is a ‘1’ or
high level, then the default is L1, otherwise it is L0.
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.
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.
SB n
[ Set the Baud rate to n ]
Issuing this command causes the chip to configure
itself for operation at baud rate n, where n is a
number from 0-7. The possible values for n, and the
corresponding baud rates are shown under the SB
column in Table 1 on page 3. (For example, issue
AT SB 5 to monitor a 19200bps LIN bus).
SM hh
[ Set the Measurement period to hh ]
This command adjusts the time allowed for a baud
rate measurement to that specified by hh, in
100 msec increments. A value of 00 is special, and
causes the default period to be used, while values of
01 to FF provide times of 0.1 sec to 25.5 sec.
Z [ reset all ]
This command causes the chip to perform a
complete reset, as if the power was cycled off and
then on again. All settings are returned to their
default values, and if the Monitor input is at a low
level, 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.
ELM630DSB
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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6 Page









ELM630 pdf, datenblatt
ELM630
LIN
Interface
LIN Data
Signal
Ground
22K
10K
+4.5V
0.01µF
4.7K
14 13 12 11 10 9 8
630 10K
1234567
3.58MHz
27pF
27pF
RS232
Interface
4.7K
2 (RxD)
3 (TxD)
5 (SG)
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Figure 3. LIN Logic Probe
ELM630DSB
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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