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  • Users: iamyo
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  1. iamyo

    Conformal coating needed for BCMs?

    Well, the answer to "why" is cost. They want to reduce cost at the minimum level! So they give you lower target price in the competition due to the fact that no conformal coating is included... but it's your responsibility to meet rqmts. I hate them! And you never know whether your competitor is...
  2. iamyo

    Conformal coating needed for BCMs?

    Comcokid, interesting answer. Let's say that you agree with me that removing the coating and making a great robust design would still not be sufficient and we would need some cleanning process right? I was thinking in ways to also avoid cleanning process therefore saving this high investment...
  3. iamyo

    Conformal coating needed for BCMs?

    Sorry! BCM stands for: Body control module or Body computer module located in the passenger compartment of the car. In general my question would be valid for any electronic module located in the passenger compartment. Thanks
  4. iamyo

    Conformal coating needed for BCMs?

    Hi, I work for a Tier1 supplier of BCMs. All our BCMs are coated during the manufacturing process. We do this because, historically, it was the only way to meet customer requirements (Humidity tests, Dewing tests, Salt Spray, ...) Recently, several OEMs are requiring to remove the coating but...
  5. iamyo

    CAN for Trucks: SAEJ1939

    Hello, I am confused with this SAE. According this SAE the typical 82C250 trasnceiver is a possible interface. However, looking for internet I saw the B10011 transceiver from ATMEL which seems to be the one for J1939. They work at different voltage levels on CAN but don't know which one is the...
  6. iamyo

    How to control bulbs in Trucks?

    Hello guys, First of all, let me congratulate all of you because of this helpful forum. Lets go to my question. I have to control bulbs of a truck in my next project. Intelligent PowerFETs in the market are design for Car environment, am I right? Which kind of intelligent FETs should I use for...
  7. iamyo

    24-volt battery vehicles?

    Félix, 1.5Amps? I guess you are using a DC/DC converter, or?. Which EMC directive do you have to fulfil? A DC/DC converter which such a high current probably gives you EMC troubles. Do you have any shielding? Antonio
  8. iamyo

    Regenerative Braking

    I have a request from a car manufacturer to include the 'regerative braking' function in an ECU but I do not know what electronics is to be included. Is just software?
  9. iamyo

    WETTING CURRENT IN CONNECTOR

    My input can tolerate switch contact impedances very high (i.e. 10Kohm) but I think it could not be enough. If there is an oxidation of the contact the process could be exponential. If there is oxidation the current through the contact is lower, as lower the current as more oxidation appears and...
  10. iamyo

    WETTING CURRENT IN CONNECTOR

    The application intends to read the switch state. The switch is connected to two modules (one of them is my module). The switch has enough weetting current (specified 10mA) because the second module has a pulsed 1Kohm pull-down resistor (10mA pulsed). Sw Bat__o/o_____ |...
  11. iamyo

    WETTING CURRENT IN CONNECTOR

    The real application is an input comming from a switch connected to battery (12v). This switch has enough weetting current. But the input of my module has a 80Kohm pulldown resistor. I cannot decrease the resistor because this would increase the current consumption. The thing is: Is it really a...
  12. iamyo

    WETTING CURRENT IN CONNECTOR

    In my application there is a wetting current of 150uA. And I think it could be a lifetime problem but I cannot guarantee. I'm using a header connector of 0.635mm2. Do you know if there is any formula or something like that which give you the minimum wetting current depending on the connector or...
  13. iamyo

    WETTING CURRENT IN CONNECTOR

    Hello, I know that for a switch, it is needed a minimum of wetting current (normally 10mA). But is it needed for a connector? Imagine a plug-in module, there is no switch between both modules, is it also needed a wetting current? Antonio
  14. iamyo

    Fog-Lamp ECU-Relay WHAT?!?!?

    When you say ECU, you mean Electronic control module? I find is too much just to control one relay. From my point of view the best solution would be to use a bistable relay i.e. from NEC as you said. I hope helps
  15. iamyo

    Highest voltage seen while engine is running

    Usually there are several requirements on voltage levels. Normal limits for Ford for example are until 15volts. Then, it exist the jump start (28v 1min), the overvoltage (19v 1hour) and the Load dump (30volts 400ms for centralized protection or even 60volts for not centralized protection) Iamyo
  16. iamyo

    SMART FETS ON 24V TRUCKS

    Hi all, Has any one experince on Smart FETs controlling 24v loads like exterior or interior lights on a truck? The most common ones like ST or Infineon seem not to be designed for this battery voltage. What's being used in the market then?? Relays? Normal MOSFETS? Thanks Iamyo
  17. iamyo

    Voltage regulator in Trucks

    Yes, what I meant is that nominal voltage is 24 volts but it is specified that it must work between 14 and 32 volts. Thanks anyway! Regards Antonio
  18. iamyo

    Voltage regulator in Trucks

    Hello, I'm an experienced designer in car body electronics. However, now, I've to design a body controller for a truck. My doubt is that I don't know which voltage regulator to use. I expect arround 150mA of current consumption which would give around 3watts of power dissipated in a linear...

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