The current drawn by the nRF21540 FEM can be monitored on the nRF21540 EK.
Current can be measured using any of the following test instruments:
- Power Profiler Kit II (PPK2)
- Oscilloscope
- Ampere meter
- Power analyzer
Power analyzer and Power Profiler Kit measurements are not described in this document. For more information on PPK2, see Power Profiler Kit II.
For measurement instructions, see Measure current profile with an oscilloscope and Measure average current with an ampere meter.
The nRF21540 FEM has a single VDD supply from 1.7 V to 3.6 V. The nRF21540 EK is prepared for measuring current on this domain. See the following table for the corresponding components.
| Component | VDD |
|---|---|
| Measurement connector | P5 |
| Series resistor | R3 |
Note: It is not recommended to use a Universal Serial Bus (USB) connector to power the system during current measurements. USB ports typically have significant noise that might impact measurement accuracy.
For more information on current measurement, see the Current measurement guide tutorial.