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TCAN1044V: TCAN transciever who can handle a voltage dump from battery up to 130 V

Kristoffer Stenberg
Intellectual 1845 points
Part Number: TCAN1044V
Other Parts Discussed in Thread: TCAN1043

Hi there,

Is there a TCAN device who can handle a dump of a battery voltage level similar to the one described in the link here:https://e2e.ti.com/blogs_/b/analogwire/archive/2018/02/28/transients-in-24v-automobiles

That article mentions LIN and not CAN, I am looking for a CAN TRX who can handle a transient of 130V. I took a quick look at TCAN1044 and its transient which goes from +100 V to -150 V which I assume means it cannot handle a voltage discharge of 130 V?

Would be perfect if there is a tech note or a whitepaper describing this?

Many thanks,
Kris

  • 0
    TI__Mastermind 47895 points

    Hi Kris,

    Both CAN and LIN transceivers experience similar transient exposure in a variety of automotive applications. Though some CAN devices like TCAN1044 are not intended to be directly connected to battery voltages, they will still be exposed to transients that exist on the CAN bus. Other CAN devices such as TCAN1043 are supplied directly by battery voltages and therefore share the same transient concerns as LIN devices. Because of these similarities, both device types use standardized waveforms to conduction transient immunity evaluation. In short - much of the information in the article you shared also applies to CAN devices. 

    The pulses defined in ISO-7637 standard (Electrical disturbances from conduction and coupling) were used to characterize TCAN1044. These pulses differ in several characteristics and present different stresses to the device under test. This is why the device has a higher voltage rating for some pulses than for others (2a at 75V vs. 33 at 100V for example). Do you know the waveform characteristics of the 130V transient you would like to endure? 

    Also note that the testing done to characterize these values may be done to a recommended standard level or to equipment limits - not necessarily to device failure. This does not mean we guarantee performance in more extreme conditions, but the device may be able to withstand more than is listed. This limit can be increased further by designing in peripheral transient protection circuits into the end equipment. In extreme conditions, this external circuitry can limit the stresses a transceiver experiences during a transient event. Let me know if you have questions about implementing these circuits.

    Regards,

    Eric

  • 0 in reply to Eric Schott1
    TI__Mastermind 47895 points

    Hi Kris,

    Were you able to find a CAN device with suitable protection specifications?

    Regards,
    Eric