Hi Support team,
The Online Power Profiler is calculating the Average Current consumption for nRF52840 DK board in a wrong way.
Calculation is of blocks. => Pre-processing, Crystal ramp up, Standby, Start radio .. and so on
Take a block, say, Pre-processing. In case of my trial,
Current 8 mA over 60 us is Average Current over that period. It is NOT Total Current.
So, when averaging out for the final result of Total average current, it is not (sum of all current from blocks) divided by (Total time).
Rather it should be sum of (current from block * length in time) divided by total time.
E.g. above,
(8 mA * 60 us) + (Crystal ramp up current * its length time) + (Standby current * its length time) + (Start Radio current * its length time) + .... divided by Total Time (4.09 ms).
This leads to Average current for the above example, 4.93 mA
| Δ (time) (µs) | Avg Current (mA) | ||||||
| Actual result (DC Power Analyzer) |
Online Power Profiler |
Actual result (DC Power Analyzer) |
Online Power Profiler |
(Actual result) µs * mA |
(Online Profiler) µs * mA |
||
| Pre-processing | 82 | 60 | 3.944961 | 8 | 323.486802 | 480 | |
| Crystal ramp up | 369 | 400 | 1.315642 | 1.6 | 485.471898 | 640 | |
| Standby | 1024 | 1072 | 0.194566 | 0.2 | 199.235584 | 214.4 | |
| Start radio | 123 | 130 | 3.017489 | 4.9 | 371.151147 | 637 | |
| Radio Tx | 328 | 288 | 11.70975 | 11.6 | 3840.798 | 3340.8 | |
| Radio switch | 164 | 159 | 7.456234 | 6 | 1222.822376 | 954 | |
| Radio Rx | 123 | 60 | 7.85647 | 10.9 | 966.34581 | 654 | |
| Standby | 205 | 155 | 1.853382 | 3.7 | 379.94331 | 573.5 | |
| Start radio | 82 | 126 | 4.511664 | 3.9 | 369.956448 | 491.4 | |
| Radio Tx | 328 | 288 | 11.607017 | 11.6 | 3807.101576 | 3340.8 | |
| Radio switch | 123 | 159 | 7.19594 | 6 | 885.10062 | 954 | |
| Radio Rx | 164 | 60 | 6.950762 | 10.9 | 1139.924968 | 654 | |
| Standby | 164 | 155 | 1.317042 | 3.7 | 215.994888 | 573.5 | |
| Start radio | 123 | 126 | 5.722221 | 3.9 | 703.833183 | 491.4 | |
| Radio Tx | 328 | 288 | 11.730833 | 11.6 | 3847.713224 | 3340.8 | |
| Radio switch | 164 | 159 | 6.583572 | 6 | 1079.705808 | 954 | |
| Radio Rx | 82 | 60 | 8.647814 | 10.9 | 709.120748 | 654 | |
| Post-processing | 451 | 350 | 2.843615 | 3.5 | 1282.470365 | 1225 | |
| Total Sum (Calculated from the above items) |
4427 | 4095 | 104.458974 | 118.9 | 21830.17676 | 20172.6 | |
| Average | 104.46 / 4427 = 0.024 | 118.9 / 4095 = 0.029 | 4.931144512 | 4.926153846 | |||
| from actual result / as Online Tool displays |
4465 | 4090 | 4.744113 | 0.024 | |||
| ==> 4.93 mA | ==> 4.93 mA | ||||||
Kindly correct the Online Power Profiler !
Thanks !
