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ADE9153A Grounding Layout Clarifications

Category: Hardware
Product Number: ADE9153A
Software Version: N/A

Hi there,

I'm a student currently working with the ADE9153A energy measurement chip for a project related to power measurement and management. I've had a couple issues getting accurate measurements even after correctly calibrating with mSure, but I suspect this may be due to how I have laid out the associated circuitry and would like clarification. For reference, the voltage being measured is the US standard of 120VAC (rms) out of a wall outlet, 15A maximum, at 60Hz.

In the wiring diagram, we see there's a ground right before the shunt resistor on the live wire, shown below:

I've seen a question answered about this already confirming that it should be there, apparently as part of the mSure calibration, but I would like to verify that this ground is the same ground that is referenced by AGND and DGND on the ADE9153A chip. If this is the case, I must be misunderstanding it conceptually, because it sounds like this could lead to 120V going into the chip unimpeded. Is the ground before the shunt resistor for sure the same ground referenced by the ADE9153A chip?

With my latest setup, I have 120V coming from a wall outlet and into a series of terminal blocks; one set for the ground wire, one set for the live wire, and one set for the neutral wire. The terminal blocks just serve as a middleman for the 120V to be measured by the chip as well as powering the system after going through an AC-DC converter. If the ground before the shunt resistor is indeed the same as the ground for the ADE9153A chip, does this also imply I should be putting a wire going from the ADE9153A chip's ground to the ground terminal block, which itself is connected to the ground pin of the outlet? This makes sense to me, but I want to make sure for safety's sake as well as proper operation of the ADE9153A. I appreciate any help that can be provided.

  • Hi,

    Thanks for your patience here, there is a very important distinction between "ground" and "earth". In a standard 3-prong US outlet you typically have Live, Neutral and Earth. In this case, earth potential is 0V but ground is different because the ground of the ADE9153A is floating on the Live voltage. This high-side current sense is a very common setup for measuring current. This brings up the point that you have to be very careful with anything interfacing with the ADE9153A, especially any component that can be touched by a human, because it is floating at the Live voltage. For example a comms port on a connected microcontroller, in which case you have to make sure to have isolation in your system much like the ADE9153A evaluation board.