Re: ISO 9141 interface board

Antmar,

Unfortunately I never drew a schematic for the circuit. I prototyped
it out, then drew up the PCB design and sent it out to be
manufactured. There are no other components on the board besides the
MC33199 chip. I later added a Pull up resistor across the +12V line
and the L line to be able to flash my target ECU with a new HEX code.

Here is a link to a pic of the board (top side only):
http://www.cannondaler.com/gallery/upload/P1010021

The Chip is basically standalone to implement a K line interface. The
DLP module provides the +5V, and the ECU provides the +12V. The
grounds of the computer and the ECU are tied together. The only other
connections are the transmit and recieve lines from the DLP to the
MC33199 chip. The chip also has a "high current drive" pin that gets
tied to the K line. Other than that there is nothing to the circuit.
In the pic you can see the silkscreen square dot indicates pin 1 of
the MC33199 and the square pin land just below the +12V connector is
the pin 1 of the DLP USB232M module.

BTW, the boards are production quality, with soldmask on both sides
and silkscreen on the top layer. They were made by expressPCB using
there ProtoPro service.

--- In opendiag@yahoogroups.com, "antmar" <antmar@b...> wrote:
>
> maybe you can provide a schematic for that board what do you say ?
> ----- Original Message -----
> From: "Tim" <tstark0529@y...>
> To: <opendiag@yahoogroups.com>
> Sent: Wednesday, December 21, 2005 7:21 PM
> Subject: [opendiag] ISO 9141 interface board
>
>
> > Hi,
> >
> > I designed and had manufactured a small PCB that mounts a motorola
> > MC33199 chip. The PCB is designed to mount a DLP Designs USB232M USB
> > interface module. The DLP USB module runs about $25. To simplify the
> > design I tied the K&L lines together because my target application
> > didn't need a seperate L line. In my application I added a pull up
> > resitor across the +12V line and the L line. If anyone is interested
> > in purchasing the bare PCB, a PCB with a MC33199 chip on it, or one
> > with a USB module drop me an email. I can provide pics as well.
> >
> > P.S. - The USB module has several lines available that could be used
> > for L line if you designed some additional circuitry.

 
Received on Fri Dec 23 14:04:39 2005