EVCS1805-S-00A Current Sensor Evaluation

Simulation Tools and GUIs
1

Hi,

I have the EVCS1805-S-00A Current Sensor Evaluation board and I am using it to measure current in my circuit. My current measurements are 2V off. I’m using an electronic load to verify my current measurements.

  1. In the datasheet of the EVCS1805-S-00A under the performance summary, what does VOUT for bidirectional options mean vs VOUT for unidirectional options?
  2. Right now I am test DC current but I will need to test AC current. How can I do so? Is that what the bidirectional vs unidirectional options are referring to? I’m guessing that I don’t have to make any changes on the board it’s just a matter of the calculation, right?
  3. In the datasheet, VOUT for the bidirectional option is:
    VOUT = .1 VCC + Sens Ip
    This means Ip, the current I am sensing, is:
    Ip = (VOUT - (.1 * VCC))/ Sens

If VOUT is 0V because there is no current then Ip doesn’t equal zero based on the equation.
(0 - ( .1*3.3))/.00264 V/A)
What am I missing? Is the calculation wrong? Please tell me the correct equation for calculating the current for both DC current and AC current.

2

I wanted to add that in order for me to get accurate current values, I have to add an baseline offset to the current equation based off of what the current reading is when there is no current through the device. I understand that this could be normal but I want to make sure.

3

@help I haven’t gotten a response in a week. Kindly please help me. Thanks

4

@Rubas.FAE Would you be able to help me get someone to answer my question please? It’s been almost 2 weeks.