How to select MCU?

Hello everyone , I remember .

Today's article , Talk about it MCU How to select .

Tell me my thoughts .

1、 Count which peripherals

If there are multiple in a system MCU, At this time, we should allocate well , If the temperature hangs 1# MCU, Bluetooth hook 2# MCU, wait .

2、 Determine the communication interface of the peripheral

Some peripherals support multiple interfaces , Such as I2C and SPI, At this time, according to the data volume of peripherals 、 Development workload 、 Previous product experience 、 Product definition 、 Power consumption and other aspects to determine the interface .

3、 Determine the level of peripheral communication interface

The level of some peripheral communication interfaces , The reference is not the supply voltage . Such as power supply 2.8V, The communication interface is 1.8V, Give chip VDDIO The voltage of ,I2C According to the external pull-up source voltage, etc , These are determined first .

4、 Determine the power supply range of peripherals

The current of some peripherals is very small , Supply voltage and MCU The voltage is the same , We can directly IO drive , Such as G-sensor.

The voltage of some peripherals needs to be converted by the power chip , At this time, we should consider increasing GPIO（ Power control pin ）.

5、 Determine the peripheral GPIO Number

According to the circuit in the specification , First, roughly determine , For example, does the power supply of peripherals need to be controlled , Break the foot , Wake up feet , Need level conversion , Do you need to add... For level conversion GPIO Enable to control .

6、 Determine peripherals GPIO The type of

What is common GPIO Can , What needs to be interrupted GPIO, Which can be configured as PWM wait .

7、 determine ADC The number of

Such as battery voltage detection ,ID Identification, etc .

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