Summary

In industrial automation and communication systems, the reliability of signal isolation and transmission efficiency have always been technical bottlenecks. Traditional optocouplers are limited by low transmission rates (typically ≤10 Mbps), weak interference resistance (CMTI <50 KV/μS), and short lifespan (<100,000 hours), making it difficult to meet the demands of high-speed communication and extreme environments. The CBMuD120X dual-channel digital isolator introduced by Corebai Microelectronics, with capacitor isolation technology at its core, integrates 90Mbps high-speed transmission, 3000V RMS isolation voltage, and 150 KV/μS common-mode transient suppression capability. It redefines the standards for industrial-grade digital isolation, providing a "robust, efficient, and low-power" domestic solution for scenarios such as RS232 communication, motor control, and power grid protection.

 

2、Industry pain points: The three core challenges of industrial communication isolation

In the complex industrial environment, signal isolation faces multiple technical bottlenecks, which directly restricts the stability and performance improvement of the system:

1、Insufficient suppression of high frequency electromagnetic interference

Frequency converters, motor start and stop, radio frequency equipment and other devices in industrial sites generate strong electromagnetic noise. The common mode transient suppression capability (CMTI) of traditional optocouplers is generally less than 50KV/μS, which makes it difficult to resist high-frequency interference, resulting in a significant increase in signal transmission error rate and a significant decrease in system reliability.

2、Transmission delay and bandwidth limitation

The transmission rate of traditional optocouplers and some magnetic isolation devices is limited (usually less than 10Mbps), and the transmission delay exceeds 100ns, which cannot meet the real-time requirements of high-speed buses such as PROFINET and CAN FD. In industrial robots and precision control scenarios, it is easy to cause instruction lag or data distortion.

3、The performance of traditional isolation devices decreases in wide temperature range

Traditional technologies such as optocouplers and early magnetic isolation devices lack sufficient performance stability at extreme temperatures: the LED light efficiency of optocouplers drops by over 30% below-20℃, and prolonged operation above +85℃ can lead to accelerated light degradation; some magnetic isolation devices experience fluctuations in magnetic permeability due to temperature changes, causing drift in isolation performance. These devices struggle to meet the long-term reliable operation requirements of industrial automation equipment in the wide temperature range from-40℃ to +85℃, while modern industrial scenarios (such as outdoor base stations, northern factories, and high-temperature production workshops) demand increasingly stringent wide-temperature stability.

3、Product breakthrough: CBMuD120X How capacitor isolation technology solves the problem of industrial communication

CBMuD120X is a high-speed 2-channel digital isolator that employs high-performance capacitor isolation technology. It can achieve a maximum signal transmission rate of 90Mbps with minimal pulse width distortion. These isolators can withstand isolation voltages up to 3000V RMS and meet conventional testing standards (UL standards), making them suitable for various applications such as industrial control signal transmission, power grid relay protection devices, and isolated power control.

In RS232 communication, the dual-channel digital isolator CBMuD120X is used to achieve electrical isolation between the controller and the RS232 transceiver, thus improving the anti-interference capability. It is usually placed between the MCU and the RS232 transceiver to achieve system isolation.

CBMuD120X Application block diagram

CBMuD120X Product features

l 2.5V—5.5V Power supply

l The isolation voltage is 3000V RMS

l The common mode transient suppression CMTI is as high as 150KV/uS

l 2.1V, under-voltage protection

l The maximum signal transmission is 90Mbps

CBMuD120X Product advantages

 

l High common-mode transient interference suppression capability: It can effectively resist the interference of external electromagnetic field environment and ensure the stability and reliability of signal transmission. In the complex and changeable industrial environment, this characteristic is particularly critical for communication systems, which can effectively reduce data transmission errors and system failure caused by external interference.

l High-speed transmission: The maximum signal transmission rate can reach 90Mbps, the transmission delay is as low as 10ns, and the pulse width distortion is as low as 5ns, which can meet the needs of high-speed data communication. Therefore, it is very suitable for scenarios with high requirements on data transmission speed, such as high-speed serial communication interface and data acquisition system.

l Low power consumption: the working current is small, and the power consumption is only 1/10 to 1/6 of that of the optocoupler under the same signal data rate. For battery-powered devices or systems that need to run for a long time, the low power consumption feature helps to extend the battery life of the device.

l Dual-channel design: Provides two isolated channels to enable two-way communication, increasing the flexibility and scalability of the system. In applications that require simultaneous isolation of multiple signals, the dual-channel design can reduce the number of devices used and simplify circuit design.

l Wide power supply voltage range: supports 2.5V-5.5V power supply voltage, can adapt to different system power supply requirements, convenient in different voltage environment.

l High isolation voltage: With an isolation voltage of up to 3000Vrms, it can effectively isolate the high voltage and low voltage parts in the system, provide safety protection, and prevent high voltage from damaging the low voltage circuit.

l Diverse and compact packaging: using SOIC8_150MIL and other packaging forms, the size is small, easy to integrate in the limited space, suitable for a variety of circuit board design and installation scenarios.

l Good compatibility: Angle compatible ADUM120X series, so that users do not need to make major changes to the circuit design when upgrading or replacing products.

 

CBMuD120X Product application

 

industrial computer:

l Signal Transmission: In industrial automation control systems, CBMuD120X can be used for signal transmission between various sensors and controllers. Its high common-mode transient interference suppression capability effectively resists electromagnetic interference in industrial settings, ensuring the stability and accuracy of signals. For example, in factory production line control systems, data such as temperature, pressure, and position collected by various sensors need to be accurately transmitted to the controller for processing. CBMuD1201 can effectively ensure the stable transmission of these data in complex electromagnetic environments.

l Motor Control: For the control of industrial motors, CBMuD120X can achieve electrical isolation between control signals and motor drive circuits, preventing high voltage or interference signals from damaging the control circuit. At the same time, its excellent high-speed transmission performance fully meets the real-time response requirements of motor control, ensuring that the motor can respond quickly and achieve precise control.

electric power system:

l Power Grid Relay Protection Devices: In power systems, relay protection devices play a crucial role in ensuring the safe and stable operation of the grid. CBMuD120X is widely used for signal isolation and transmission between different circuit modules within relay protection devices, effectively enhancing the system's resistance to interference and reliability. For example, in current detection and fault diagnosis, CBMuD120X can ensure accurate signal transmission, preventing malfunctions or failures due to interference.

l Solar Inverter: A solar inverter is a critical device that converts the direct current generated by solar panels into alternating current. CBMuD120X can be used to isolate the control circuit from the power circuit of the inverter, preventing high voltage and large currents from affecting the control circuit. Additionally, the low-power characteristics of digital isolators help reduce the overall energy consumption of the inverter, thereby improving energy conversion efficiency.

communication apparatus:

l Alternative Optocouplers: In some communication devices, traditional optocouplers may be limited by factors such as size and cost. CBMuD120X can serve as an alternative to optocouplers, enabling the isolated transmission of digital signals. It is compact, stable, and reliable, eliminating the need for external drivers and other discrete components, thus simplifying circuit design and further reducing overall costs.

l Data transmission interface: In the data transmission interface part of communication equipment, CBMuD120X can provide high-speed digital signal isolation transmission to ensure reliable data exchange between different modules. For example, in serial communication interface, Ethernet interface and other scenarios, CBMuD120X can play an important role.