Power Profile Kit II doesn't show current value when it is testing the current in GND

[huapage]

I am testing the current consumption of SIM cards with PPK2.

When PPK2 is connected to VCC ( voltage 1.8 v or 3 v ), the PPK2 can display the current properly ( around 9 mA ).

But when PPK2 is connected to GND ( voltage 0 ), the PPK2 cannot display the current properly ( display as 1 mA, but actually it should be 9 mA ). With oscilloscope I can see correct current value.

PPK2 current measurement cannot work properly in low voltage?

Application Version is 4.1.2

[SwRa]

Hello,

Could you perhaps share a picture of your set-up/the connections that you made.?

Regards,

Swathy

[huapage]

Hi Swathy,

With the setup described, do you have any comments?

Especially the test case of Power VCC (5V) --> 500 ohm resistor (R1) --> PPK2 VIN --> PPK2 VOUT --> 0 to 100 ohm adjustable resistor (R2)  --> GND, when you increase the R2, there is a spike when R2 is around 47 ohm. After that spike, the test result becomes correct.

Thanks,

Huang Weichao

[huapage]

If PPK2 cannot measure correctly when VOUT is in low voltage, at least in UI need to show a warning to tell the user the measure may not be correct so that it will not misleading the user.