Other Low-Power Mode Considerations; Clocks - Infineon PSoC 4000S Manual

PSoC™ 4 MCU low-power modes and power reduction techniques

Other low-power mode considerations

6 Other low-power mode considerations
This section presents tips, tricks, and recommendations related to the use of PSoC™ low-power modes.
6.1

Clocks

In some cases, running the clocks faster can result in a lower average current consumption. For example,
consider a PSoC™ MCU design that takes a reading from a sensor once every second, performs several
calculations, and then transmits the results to another device.
You can use sleep or deep sleep mode to reduce the power when the PSoC™ MCU device is idle, but the average
current consumption is higher because of the time spent in active mode.
current consumption of this example with the system clocks set at 3 MHz.
Figure 4 Example current profile with 3-MHz clock
Depending on the tasks or calculations that are being performed when the PSoC™ 4 MCU device is awake, it
may be possible to complete them sooner by running the system clocks faster. This can reduce the average
current consumption because the PSoC™ 4 MCU device is in active mode for less time.
representation of active mode timing, broken up into tasks.
Figure 5 Analysis of tasks in active mode at 3 MHz
Application Note
A B C
A – Wake from sleep
B – Read sensor data
C – Manipulate data
D – Transmit result
E – Go back to sleep
16 of 38
Figure 4 is a representation of the
Figure 5
D E
Time
is a
001-86233 Rev. *I
2021-11-04