Analysis of two isolation chips commonly used in the SPI bus: 6N137 and ADuM315x

SPI is a serial peripheral interface. It is a high-speed, full-duplex, synchronous communication bus. Because it only takes four wires on the pins of the chip, it saves the pins of the chip and at the same time lays out the PCB. Space saving and convenience. For this simple and easy to use feature, many AD converters transmit data in SPI bus mode.

SPI Isolation Chip: 6N137 In the industrial field data acquisition, due to the complex situation on site, there is a high common mode voltage between each node. It is easy to cause the SPI interface to fail to work properly, and even severely burn the chip and equipment. Therefore, in a strong interference environment, or high performance requirements, it is necessary to electrically isolate the various communication nodes of the SPI bus. The traditional SPI bus isolation method is optocoupler technology, which uses beams to isolate and protect the detection circuitry and provide a secure interface between the high voltage and low voltage electrical environments. At present, 6N137 opto-isolated devices are generally used. Take Toshiba's 6N137 as an example. The device operates at 5V, the maximum speed is 10Mbps, the operating temperature is generally 0°C to 70°C, the isolation voltage is 2500Vrms, and it is packaged in DIP8 type. Only one isolation channel is provided. These capabilities have limited the use of 6N137 in more demanding environments.

SPI isolation chip: ADuM315x

ADI's new four-channel digital isolators, the ADuM315x, offer a wide range of applications in the SPI bus and other demanding applications due to their superior performance advantages over opto-isolated devices. The circuit that uses the 6N137 to isolate the SPI is complex, requiring a large number of resistors and transistors to ensure the normal operation of the 6N137. The ADuM315x in ADI's ADuM digital isolators can completely replace the entire circuit. It only requires two bypass capacitors of a general-purpose integrated circuit to work properly. The ADuM315x family of isolators is more than six times faster than competing optocoupler or digital isolator-based solutions, with a size that is less than 80% smaller and a lower cost of 85%. Faster SPI clock rates help increase the throughput of your data acquisition system, providing higher performance and faster system response times. The high level of functional integration provides system designers with a simple high-speed SPI signal isolation solution that integrates the low-speed state and control signals typically required in a single package. At the same time, the ADuM315x family supports a wide range of high-speed, SPI communication applications, including distributed control systems, programmable logic controllers, and sensor monitors used in industrial automation, instrumentation, and motor control. The highly integrated ADuM315x SPI digital isolator family requires only three components to simplify the design of a complete SPI digital isolation solution compared to 18 to 32 components required for alternative digital isolators or optocoupler solutions.

The ADuM3151, ADuM3152, and ADuM3153 offer four high-speed channels in different configurations and three additional independent, low data rate channels with integrated auxiliary/control signal isolation.

The ADuM3154 digital isolator provides a slave-selectable multiplexing system that can hold up to four slave devices with one isolator. The digital isolator supports a 17MHz clock and requires only two pins, saving one MCU's GPIO. The slave can be selected by two pin-addressable slaves while the fast SS channel is used to gate the slave for precise timing.

ADI, also known as Analog Devices Semiconductor (Shanghai) Co., Ltd., is a world leader in the design, manufacture and marketing of high performance analog, mixed-signal and digital signal processing (DSP) integrated circuits (ICs) for virtually any type of product. Electrical and electronic equipment, established in 1965, with 15,000 employees and more than 4,700 patents, innovative products including data converters, amplifiers and linear products, radio frequency (RF) ICs, power management products, sensors based on microelectromechanical systems (MEMS) technology, Other types of sensors and signal processing products, including DSPs and other processors.

Analog Devices also offers engineers the evaluation boards EVAL-ADUM3150Z, EVAL-ADUM3151Z and EVAL-ADUM3154Z for this series of isolators. These EV kits provide access to all data channels, multiple connectivity options, support for Tektronix active probes, cable termination, support for PCB edge mounted coaxial cable connectors, and ease of configuration for engineers.

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