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FAQ
In Power-down mode, how to control a chip to achieve the most energy-efficient state? Issue Date：2015-09-09
In Power-down mode, power consumption of chips can be divided into three parts:
- CPU and chip peripheral;
- GPIO pins;
- Analog modules.
Among these, the CPU and chip peripheral consumes the most power, several times more than the sum of the other two. In Normal mode, the power consumption of GPIO pins and analog modules almost can be ignored. The user can also control the power consumption of chip peripheral by adjusting the frequency of clock sources.
However, when the system enters Power-down mode, the chip will stop HXT and HIRC operations, that is, the CPU and chip peripheral does not consume any power, and only the GPIO pins and analog modules consume power. If both the GPIO pins and analog modules are set incorrectly, in Power-down mode, leakage problems will occur in the system.
To achieve the most energy-efficient state in Power-down mode, the user needs to refer to the following settings:
- When GPIO is set to Output mode, I/O may produce a drive current to drive external components; the user must reduce the drive current in accordance with circuit characteristics. When GPIO is set to Input mode, I/O must be maintained to high or low level, not in floating state. Thus, it is possible to prevent GPIO power consumption due to external interference.
- Due to the factors such as circuits, the power consumption of analog modules cannot be reduced through stopping clock operations. The user has to set the register of the peripheral to disable the power consumption of analog modules, e.g. ADCEN set to ‘0’ to disable A/D converter analog circuit power consumption.
| Products: | Microcontrollers ,Arm Cortex-M0 MCUs ,M051 Base Series ,M0518 Series ,M0519 Series ,Mini51 Base Series ,Nano100/102 Base Series ,Nano110/112 LCD Series ,Nano120 USB Series ,Nano130 Advanced Series ,NUC029 Series ,NUC100/200 Advanced Series ,NUC120/122/123/220 USB Series ,NUC130/230 CAN Series ,NUC131/NUC1311 CAN Series ,NUC140/240 Connectivity Series ,Arm Cortex-M4 MCUs ,M451 Base Series ,M451M Series ,M452 USB Series ,M453 CAN Series ,NUC442/472 Series ,NUC505 Series |
|---|---|
| Applications: | |
| Function: | Peripherals,System Operation,Power-down |