PPM is one of the basic units of quartz crystal oscillators, indicating the accuracy and relative deviation of the crystal oscillator. PPM stands for one part per million, which indicates how much the
-Sun Wenbo, our reporter Analog chips and digital chips are like twins. Unlike the high speed and quickness of digital chips, the analog chip family that came into being earlier seems so peaceful and
The CH554 manual introduces that the chip has a unique ID number:Using the ID number, we can perform encryption, identity recognition and other functions. In order to read this ID number, you need to
1 Introduction The navigation and positioning signals sent by GPS satellites are an information resource that can be shared by countless users. For the vast number of users on land, sea and space, as