How to choose chips?-Part Two



3.1 Consider whether the chip has PWM function.

3.2 Consider that the most complex system requires several PWM output functions. See if the chip meets.

3.3Consider whether the PWM output meets the existing functions. For example, duty cycle, period. Lumen timer PWM does not support prescaler.

3.4RTC: Consider whether the chip has its own RTC function. If it comes with RTC function, you need to consider how the chip's RTC software and hardware work, whether there is a data retention function, and enter the RTC . What is the power consumption after mode. After all, low power consumption requires consideration of how long the battery can work.

3.5 Heartbeat: Since the IO port interrupt function is adopted, it is necessary to consider whether the chip supports the IO port interrupt, and what kind of interrupt (rising edge/falling edge/level) the IO port supports. and It is necessary to consider whether the number of IO port interrupts is sufficient in the most complex system.

3.6 ADC: Consider whether it has ADC function, as well as ADC conversion rate and ADC accuracy. And it is necessary to consider whether the reference power of the chip ADC is generated internally, if it is generated internally,It depends on whether the internal reference power supply can be input to the outside through the IO port, because if the voltage of the reference power supply is inconsistent with the chip supply voltage, and then due to accuracy requirements, if full scale is required, then it needs to be made externally. The reference power supply of the same voltage. Luminous ADC has its own internal reference voltage, but it does not provide external output.

3.7 Capture: Consider whether the capture function is suitable. Capture the number of bits of the timer, whether the input clock source can be divided, and whether the timer overflow can be interrupted.

4. Consider the difficulty and cost of building a software and hardware platform.

4.1 Consider whether the chip has an emulation and debugging interface, what tool is used for emulation, and whether it is compatible with the company’s existing debugging tools.

4.2 Consider what software is the software development environment of the chip, such as IAR. Of course, it is best if it is compatible with the company's existing development software, so as to minimize the development cycle and difficulty.

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