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Description
The foundation here represents the minimum system of the single chip
microcomputer, which is the simplest working environment in which the single
chip microcomputer can normally execute the program. Without these, the single
chip computer is unable to run the program.
The minimum system consists of a power supply circuit, a clock circuit, and a reset
circuit. The minimum system of most chips needs to contain these three circuits, while
some chips can use no external clock, and their internal chip can provide a clock reference
for the program to run through the RC oscillator.
abb DSPC 150
The power supply circuit of the foundation. Taking STM32 series single-chip microcomputer as
an example, its operating voltage is 2.0V~3.6V, and it usually uses 3.3V power supply.
Suppose we use a 5V power supply to supply power to the circuit board, so we need to convert
5V to 3.3V to supply power to the MCU. Considering that the microcontroller needs to work in a
low-ripple power supply environment, linear step-down power supply (LDO) is chosen here. After
the design purpose is clear, it is necessary to choose the scheme.
What needs to be done: Use the LDO chip to reduce the 5V voltage to 3.3V and meet the power
requirements. There are many programs that can achieve these needs, and I briefly listed several commonly used chips below.
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