Hello everyone, I am Goat-kun. In electronic circuit hardware development, if you want the circuit board system to operate normally, its signal quality must be flawless. Issues with signal quality can lead to signal recognition errors or reduced longevity, among other problems. Therefore, a qualified electronic hardware product must ensure signal integrity (SI). Signals can … Read more
Click the blue text Follow us Abstract: Why is it necessary to install terminal resistors in CAN bus networks? In the article detailing the characteristics of CAN bus: high-speed CAN bus and low-speed CAN bus, it is stated that both high-speed and low-speed CAN networks require terminal resistors to be installed. High-speed CAN networks require … Read more
The CAN bus terminal resistor, as the name suggests, is the resistor added at the end of the bus. Although small, this resistor plays a very important role in CAN bus communication. The Role of Terminal Resistors There are two main roles of the CAN bus terminal resistor: 1. Improve anti-interference capability, ensuring the bus … Read more
When it comes to snake lines, many PCB engineers are not unfamiliar with them. Snake lines are a commonly used routing method in PCB design, primarily aimed at adjusting delays and meeting system timing design requirements. However, many engineers often misuse snake lines, leading to reduced signal quality and a less aesthetically pleasing board. So … Read more
The terminal resistance of the CAN bus is generally 120 ohms. In fact, during the design phase, it consists of two 60 ohm resistors connected in series. There are typically two 120Ω nodes on the bus, which is a basic understanding for anyone who knows a little about CAN bus.However, as a struggling student, I … Read more
Another colleague has encountered a problem. After receiving the prototype circuit board, they found that the Ethernet could not be pinged at all. While helping to check the circuit, I discovered a detail that 99% of people overlook: 🧐 The most feared thing when designing a PCB is this “Schrödinger’s Pin” — the center tap … Read more
Introduction In some EMI testing items (such as RE), there may be cases where radiation exceeds standards due to SPI communication. A common solution is to add an RC filter to the SPI communication loop, which can attenuate high-frequency noise to improve radiation levels. However, adding an RC filter can affect the signal quality of … Read more
The RS-485 bus is widely used in industrial environments, which may experience high levels of electrostatic or surge interference. Engineers typically use gas discharge tubes and TVS diodes to build protection circuits. However, the capacitance of these circuits can be high, and improper application may affect communication. This article will introduce a low-capacitance peripheral circuit. … Read more
Hello everyone, I am Goat.I2C signals are a very common type of signal. It is a two-wire serial bidirectional bus used to connect microcontrollers and external devices. Because it only requires two pins (CLK and DATA), the hardware implementation is simple and highly scalable, making it widely used for communication between multiple integrated circuits ICs … Read more
In PCB (Printed Circuit Board) design, factors such as signal transmission stability and impedance matching are typically considered. Choosing the appropriate stacking scheme is crucial to meet design requirements. In certain cases, especially when designing six-layer boards, a special design scheme known as ‘pseudo eight-layer’ may be adopted. The ‘pseudo eight-layer’ actually refers to a … Read more