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TCAN1042HV: need to cut off VCC power to achieve Max 5uA at standby mode ?

Part Number: TCAN1042HV
Other Parts Discussed in Thread: TCAN1042-Q1, TCAN1042V-Q1

Hi team

TCAN1042 D/S say Devices with "V" suffix consume Max 5uA at standby mode,

and I found the sentence that "VCC not needed in standby mode".

my question is,,,

to achieve Max 5uA at standby mode,

I have to cut off VCC power intentionally by using external power FET ?

or without doing that, IC will consume Max 5 uA at standby mode even if VCC power is still connected on VCC pin ?

it is confused.

  • Paul,

    The parameter you are referring to, ICC, is the current from the VCC supply. The datasheet is stating that if a device with the "V" suffix is used, VCC is not needed because the device can function off of the VIO supply. In devices with the V suffix, the VCC supplies the CAN bus, but since in Standby the CAN bus is not used, the supply is not necessary.

    If there is no VCC supply, then there is no ICC parameter. Otherwise, if VCC is connected during Standby mode, this is the current you will see being consumed by the transceiver from the VCC supply.

    Regards,
  • Hi Eric

    I am a little confused about I have to add IIO(I/O supply current) for total current consumption,

    and I would like to konw what is IIO.

    here is my further questions.

    [1] at Standby mode with "V" suffix, the total current consumption is Max 22uA(= Icc + Iio = 5uA + 17uA) ?

    [2] at Standby mode without "V" suffix, the total current consumption is Max 39uA(= Icc + Iio = 22uA + 17uA) ?

    [3] at Normal mode regardless of With "V" or Without "V", I have to add 300uA for total current consumption ?

  • Paul,

    Sorry for the confusion.

    IIO is only a parameter on a device with a "V" suffix, as there is a VIO pin which is separately supplied. On a device with no "V" suffix, there is no VIO pin, and thus no VIO supply and IIO current. So a device without the "V" suffix and with the "V" suffix have a total of 22uA current consumption in Standby mode, it's just split between two supplies on the device with the "V" suffix.

    TCAN1042-Q1 = 22uA current consumption in Standby mode, all from VCC

    TCAN1042V-Q1 = 22uA current consumption in Standby mode, 5uA from VIO, 17uA from VCC

    So on devices without the "V" suffix, there is no IIO parameter, because there is no VIO supply at all.

    Does this make sense?

    Regards,