lambda probe interface IC - CJ125 from Bosch

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  1. - 2nd April 2007, 10:08 #1
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    Default problem about cj120

    Hi all here
    now I am to complete the oxygen percent measurement employing the cj120 chip . I notice that in its CJ120_Product_Info the chip present volt UR to calculate the internal Ri basing on the Rcal about 82.5 ohm , but I dont know how to get the precise value of Ri, is there any famulation about that? I made the Ri always arroud 120 ohm , it couldn't reach the value 80 of 780 .

    another question is how to use the UA to calculate the lambda value , I made the Ip value with the equation Ip=(UA-1.50)/(61.9*17) but how do I get the lambda value , looking up the table ,but where to get the lambda-IP table? Or is there any other ways to get the lambda because I noticed that they present a formulation between the XO2 % and the lambda =(XO2 /3+1)/(1-4.76*XO2 ).
  2. - 16th November 2007, 17:42 #2
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    Default BOSCH IC - CJ125 - $ 28.95 - Cheapest i've seen.

    Hello Everyone.
    I landed on this forum serching for information about the CJ-125
    I have purchased 8 of them last month from BOSCH and I'm experimenting with them.
    If anyone is interested I will have 7 for sale, ince I don't need all of them.
    They are new.

    I'll post some good diagrams and tech support pdf files later on today.

    Regards.
    Gaston
    [email protected]
  3. - 13th December 2008, 18:34 #3
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    I have been hunting for the CJ125 for ages.
    How the hell do you get your hands on this.
    Why do they make it so hard ?
  4. - 13th December 2008, 18:55 #4
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    Default

    2 min on Google.
    http://www.futureelectronics.com/en/...spx?CrossPart=
    Looks like Future is your best bet for this part, The US Distributor appears only to sell Complete Units here is their link:http://www.chiefenterprises.com/dnn/
    I have a hunch this is the chip used in their Hot Film Mass Airflow Sensors, here is a link to the sensor page of their website.
    http://rb-k.bosch.de/en/powerconsump...ement/hfm.html
    Last edited by Archangel; - 13th December 2008 at 19:27.
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  5. - 14th December 2008, 01:34 #5
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    yeah this time google thru up one name futureelectronics.com wasn't like that last time i checked. they even have a Bangalore office will call them on Monday.
  6. - 14th October 2009, 15:35 #6
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    Anyone have any more information than the thin 7 page datasheet from Bosch? I am starting a design with this chip, and I am getting nowhere with either Bosch or Rutronik.
  7. - 29th March 2011, 19:36 #7
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    Default Re: lambda probe interface IC - CJ125 from Bosch

    For more information you could check my website:
    www.breitband-lambda.de

    I don't have more than these seven sites, but I was able to run it

    Sebastian
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