Application Note
28 of 38
001-86233 Rev. *I
2021-11-04
PSoC™ 4 MCU low
-power modes and power reduction techniques
Code examples
Figure 15
Measuring project active mode parameters
If you average the power for both active and deep sleep modes, as shown in
, it is easy to see that using
the deep sleep low-power mode reduced the 5-mA current from active mode to an average of 6.7 µA, almost by
three orders of magnitude!
Table 4
Average power calculation
Deep sleep
Active
Total
Unit
Time (ms)
999.4
0.63
1000
ms
Current (µA)
3.5
5000
µA
Time × I
3498
3150
6648
ms × µA
Average current
6.7
µA
To put all this into perspective, if this project were running on a 300-mAh battery without using the low-power
mode, the battery life would be about 60 hours (300 mAh / 5 mA). With power mode cycling, the same 300-mAh
battery would last almost 44,800 hours, or over 5 years!
Of course, the duty cycle time in both active and deep sleep modes greatly affects the average power, but so
does the power consumed in each of those modes. Cycling between two power modes does add some
complexity to the design, but for battery-powered applications, it may be well worth it.
