Average Power - Infineon PSoC 4000S Manual

PSoC™ 4 MCU low-power modes and power reduction techniques
Code examples
Figure 14 AN86233_DeepSleepADC program flow
7.3.3.1

Average power

To determine the average power of this example, you need to measure both the time and current in each mode,
assuming that the duty cycle between power modes is consistent. This period of the firmware is about 1
second. So, if you add up the time that the PSoC™ 4 MCU device stays in Active and deep sleep modes in one
period, it would be about 1 second.
First, measure the current consumption and the time that the device stays in active mode.
that the duration in active mode is about 630 µs, and it consumes about 5000 µA (5.0 mA) during that time. You
can also see the UART communication in
deep sleep until the UART has completed its transmission. The duration of the LED drive (active LOW) signal,
along with the current measurement, is used to determine whether the device is in active mode versus deep
sleep mode. In deep sleep mode, the current is about 3.5 µA, and the signal duration is about 999.4 ms.
Application Note
Reset
Init HDWR
Set up WDT0 for 1-
second wakeup
Ready to Yes
trim ILO?
No
Get ADC reading
Convert to temp
Send out UART
UART No
done?
Yes
Go into
deep sleep
Yes
WDT0 No
1 sec?
Figure 15 and notice that the PSoC™ 4 MCU device does not return to
27 of 38
Trim ILO every
60th time through
the loop.
Trim
ILO
Make sure data is
totally sent before
going to sleep.
Figure 15 shows
001-86233 Rev. *I
2021-11-04