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INA216: INA216A4

JH Shin
Guru 11480 points
Part Number: INA216
Other Parts Discussed in Thread: INA210, INA180, INA183

Tool/software:

Hello,

My customer has a question about the input voltage specification while using INA216A4.

According to the specification table below, the input voltage (Common Mode) is confirmed to be GND - 5.5V.

Would it be a problem if they use this voltage a little higher (around 5.7V-6V)? Please let us know what problems you anticipate.

According to comment (3) above, I think you can use a voltage higher than 5.5 V if the input current is less than 5 mA. Is this correct?

Thank you.

JH

  • 0
    Guru 318700 points

    When you exceed the common-mode voltage range, correct operation is no longer guaranteed.

    The absolute maximum ratings merely guarantee that the device does not get damaged. (And you will not be able to limit the input current without clamping the voltage.)

  • 0 in reply to Clemens Ladisch
    TI__Mastermind 35260 points

    Hi JH,

    External limiting circuitry is necessary in order to limit the input current to below 5mA, otherwise we run the risk of damage due to excessive current as Clemens mentioned. But yes, if the current is limited, voltage of higher than 5.5V is allowed.

    Regards

    Guang

  • 0 in reply to Guang Zhou
    Guru 11480 points

    Hi Guang,

    Thanks for your reply.

    The customer has further questions.

    Q1. They believe that the input current of the IC will be limited to less than 5mA by resistors R1 and R2 in the above INA216 block. Could you please explain in more detail why external circuitry is needed to limit the input to less than 5mA?

    Q2. Could you please provide an example of the external circuitry they need to add to get an input voltage of about 5.7V - 6V with INA216?

    BR,

    JH

  • 0 in reply to JH Shin
    Guru 318700 points

    1. The clamping diodes to GND and VCC are not shown in that image. To limit the current, you would need a resistor.

    2. The purpose of this device is to measure the voltage. Using a circuit to change the voltage would make the result meaningless.

    Please specify your actual requirements. But to measure voltages up to 6 V, you must use a device with a wider common-mode voltage range like the INA210 or INA180.

  • 0 in reply to Clemens Ladisch
    TI__Mastermind 35260 points

    Hi JH,

    Please refer to comments by Clemens.

    In addition to the devices Clemens recommended, another option is the INA183. Similar to INA216, it doesn’t have a separate supply pin, but with much wider common mode range.

    Regards

    Guang