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manford_desmond 12-06-2011 05:18 AM

Freescale MC33290 Replacement
This info was hard to find, so I decided to make a thread. The SI9243 seems to be a replacement for the Freescale IC described in the OBDuino documentation and is available in small quantities at Newark (not Mouser or Digikey):

The relevant posts in the OBDuino thread are on page 69 (I can't post links).

icynjuve 12-22-2011 11:11 PM

the Si9241A seems to be a suitable replacement as well...
Someone else commented in the OBDuino wiki that the Vishay Si9241A works as well (tried and tested). I have ordered the Si9241A and am waiting for it to arrive.

Will provide feedback again after trying it out for myself.

lamb.chop 01-19-2012 11:46 AM

What about the Freescale MC33660, available from Freescale as samples for $6 for 5......

lamb.chop 01-24-2012 06:28 AM

Ordered 5 samples, received yesterday, excellent service........

dar 02-10-2012 02:34 PM

I used SI9243 (only K line) and it works. Better quality schematic:


OLD link:

blinder 08-25-2012 09:49 AM

Here you take +12V on car cigar socket? You take only +12V without car sigar socket's ground?

dar 08-27-2012 12:57 PM

There is no need for additional +12V supply from car cigaret socket. The schematic gets +12V from OBD socket.
This schematic was used instead of MC33290 in standard OBDuino ISO diagram.
Link: OBDuinoDiagram - opengauge - Whole diagram of the Arduino board, LCD, interface - Open Source Fuel Efficiency Instrumentation - Google Project Hosting
P.S. Only difference is in 510R, which was increased to 560R (That I found in internet).
P.P.S. 1N4004, 100R was used for protection SI9243 (from SI9253 datasheet).

Best regards

blinder 09-03-2012 12:58 PM

I'm trying to make it with 9243. And for example pin1 of DB9 connects to 9243 and also somewhere else. On the other side that DB9's pin1 goes to OBD pin5. In my car, OBD pin5 doesn't have contacts. My car is a Rover. Any ideas?

dar 09-07-2012 04:40 PM

1. I had very similar situation: In my car (VW Passat) in the cars OBD connector wasn't pin 4, which goes to DB9 pin 1 (GND ground). So I connected together DB9 pins 1 and 2 (OBD 4 and 5).
Have You looked in OBDuino page?
Link: OBDuinoInterface - opengauge - OBDuino OBD2 cable and Interfaces - Open Source Fuel Efficiency Instrumentation - Google Project Hosting
Link: OBDuino32K - opengauge - Homepage of the OBDuino32K Project - Open Source Fuel Efficiency Instrumentation - Google Project Hosting
2. Which OBD protocol is used in yours car (Rover) it is necessary to check in internet?
From OBDuino page link: OBD-2 Liste (erfolgreich) gescannter Fahrzeuge - Rover (2000 year) - ISO 9141-2

Best regards

blinder 09-10-2012 11:19 AM

Yeah I've looked at these pages.
My rover is older, 1997, as far as I know it uses the older iso 9141 standard.
How did you know which pins to connect together? I don't even know the correct orientation of my car's obd connector. But I checked either ways and in none of these pin 5 would have contacts.

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