Power module design Power module design ARM microprocessors are particularly suitable for portable system applications due to their high performance and low power consumption. System-level power supply issues are also very important for effective power management. On the one hand, the power module should meet the different power voltages of each module as much as possible, and on the other hand, efforts should be made to reduce the power consumption of the embedded system. [52RD.com] 1 Example description [52RD.com] The power supply system of electronic equipment includes AC power supply and DC power supply. The power supply part is the basis of the entire system. The stable operation of this part plays a vital role in the stable operation of the entire ARM core board, and the ARM processor also has advanced system status control and power management. In terms of power supply, the level signals on each component or even on each pin of the same component may be different, so the power supply requirements of the entire system must also be clear. [52RD.com] This example mainly analyzes the working state of the power supply, and then gives the hardware design of the power supply part in the ARM system and the software operation of power management. [52RD.com] 2 Power supply working principle [52RD.com] 2.1 System working state [52RD.com] Almost all ARM processor designs have an idle mode. In the idle mode, the processor clock stops to reduce the power consumption of the processor in the idle state. When the embedded operating system finds that the processor currently has no executable tasks, it puts the processor in the idle state. When an interrupt occurs in the system, the processor is awakened from the idle state. Most systems have operating system timer interrupts, so the processor may enter the idle state thousands of times in a second. [52RD.com] It is worth noting that the processor idle mode only affects the processor itself and has no effect on other hardware in the system. The system state switching is shown in Figure 5-1. [52RD.com] Figure 5-1 shows the basic power management and working states, which are as follows. [52RD.com] [52RD.com] [52RD.com] 1. System suspend mode [52RD.com] In the system suspend mode (also known as sleep mode), only the following components continue to work: SDRAM, processor power management circuit, wake-up circuit. [52RD.com] Because the contents of SDRAM are affected by...
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