Measuring Power Consumption on CY8CKIT-042-BLE

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Anonymous
Not applicable

I tried to measure the power consumption of CY8C4247LQI-BL483 device while it is in DeepSleep mode. I followed the instruction in "Project # 27: PSoC 4 BLE - Power Consumption Optimization" by measuring current across the jumper J15. The main() function consists of four lines of code as follows:

   

CySysClkIloStop();
CySysClkEcoStop();
CySysPmDeepSleep();
while(1);

   

The current across the jumper J15 shows around 1mA. But when I took the device out of the development kit and feed 3V directly to the device via VDDD and GND and measured the power consumption (between 3V source and VDDD), I got around 3uA as expected. I'm not sure what I did wrong when I try to measure the power consumption from the jumper J15.

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rola_264706
Level 8
Level 8
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Tkosiyat: Check out these manuals.

rola_264706
Level 8
Level 8
50 likes received 25 likes received 10 likes received

Tkosiyat: The multimeter used in this application note in not a normal DVM.  This is an expensive Multimeter that can remove current injection from the multimeter.
Input bias current:Ideally, no current flows into the measurement terminals
of your DMM. In real measurement situations, there are always input currents
creating additional measurement errors. Truevolt DMMs take care of input bias
current. Some alternative DMMs offer 20% to infinitely poorer performance
(some are too noisy to measure).  I think you are measuring noise and other current loops not the device.

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Anonymous
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I think I need a a good multimeter. Can you recommend me one?

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