How to choose chips?

 Abstract: In the process of electronic research and development, we often face a situation that the product needs more functions, so we have to choose a newer version of the chip. During the evaluation process, we often faced with a variety of chips to choose from. How to choose the most suitable chip becomes especially important at this time. So how to make a correct judgment? Below, chipmall.com-One of the largest electronic components online in China will give you a detailed answer.



1.  Choose a chip in the mature stage.

1.1 Because the product is in the mature stage, the quality is relatively stable and reliable.

1.2 There are many existing materials and reference designs, which are easy to use.

1.3 You can't just look at the datasheet to see if the new features of the product can be realized, but also look at the user guide and errata. For example, if you want to use the USB function for a lumen chip, need two additional IO ports as the configuration pins of the host/device, which cannot be fully controlled by the software. In addition, you also need to check which conditions the chip meets, civilian grade or Industrial grade, do you need special electrostatic protection, for example, several IO ports of lumens need special protection (indicated in errata).

1.4 Products in the mature stage are relatively reliable in supply. The production cycle of a large manufacturer generally takes several years. Even if it is no longer in production, there will be an upgraded version of PIN TO PIN.

1.5 Choose products from larger companies, and there are many reference materials. The reason why this article is ranked last is that the unit price of some products of large companies is more expensive than that of small companies.

 

2. To meet the functions of the existing design.

2.1 The appropriate chip should be selected according to the function of the product. Don't just focus on the main function or the new function, check whether all the functions are in compliance. Often large functions are compliant, but some small functions are not, causing waste. Take our products as an example: our meters are equipped with LED/LCD display, RS485 communication, fan PWM control, I2C communication, UART communication, key scanning,Buzzer PWM control, RTC, heartbeat detection, ADC detection, etc., RPM capture.

2.2 LED/LCD display: Which interface is used, such as SPI, IO port simulation, etc. If you can use SPI, etc., you need to consider how many channels of SPI of the chip are in total and whether it meets the number of SPI channels of the most complex system.

2.3 RS485 communication: What kind of interface is used, such as UART or others. If you use UART, you need to consider how many independent UARTs are needed in the most complex system, and whether the chip is compatible.

2.4 Fan PWM control:

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