LTC6820HMS#TRPBF

Specifications

LTC6820HMS#TRPBF Key Features

• isoSPI™ single-pair differential line communication technology

  • Full-duplex SPI communication can be achieved using only one pair of differential lines, which greatly reduces the wiring and isolation overhead compared to the four signal lines (MOSI, MISO, SCK, CS) required by traditional SPI, and is particularly suitable for long-distance or multi-slave node systems.

• Master-slave dual mode compatibility, flexible expansion

  • The LTC6820 can operate in master or slave mode, allowing for flexible construction of cascaded BMS systems, daisy-chain topologies or remote IO systems.

• High anti-interference and long distance support

  • The differential signal transmission method has strong anti-EMI capability, and the communication distance can reach more than 100 meters, meeting the needs of industrial and automotive wiring.

• No additional isolation components required, simplifying design

  • Isolated communication is achieved through transformer coupling, eliminating the need for traditional optocouplers or digital isolators, reducing system complexity and cost.

• Support high-speed SPI communication (1Mbps)

  • It meets the high bandwidth requirements of BMS real-time battery status monitoring, electric vehicle power battery data transmission, etc.

• Compact Package + Industrial Temperature Range

  • It adopts MSOP-10 package with heat dissipation pad, which is suitable for high-density board design and adaptable to harsh industrial and automotive environments.

Typical application scenarios

The high isolation, low latency and anti-interference capabilities of the LTC6820HMS#TRPBF make it widely used in the following fields:

• Battery Management System (BMS)

  • Used for multi-string battery isolation communication in electric vehicles and energy storage systems, connecting the main control MCU and battery monitoring chip (such as LTC6811/LTC6813).

• Automotive powertrain

  • Realize reliable communication between ECU and high voltage module, and ensure the integrity of system control instructions and status feedback.

• Industrial Remote IO Control

  • Used for SPI bus extension and signal isolation in remote PLC modules, distributed sensor and actuator networks.

• Smart Grid/Energy Storage System

  • Used in modular power management and status monitoring systems to achieve data interaction under high voltage isolation.

• High voltage power supply system

  • The low-voltage control unit and the high-voltage power stage are connected via isoSPI isolation to ensure safety and anti-interference.

Advantages comparison analysis

The LTC6820 significantly reduces system cost and EMI sensitivity while maintaining high performance through isoSPI technology, making it the preferred solution for SPI communication isolation in modern industrial and electric vehicle systems.

Manufacturer introduction: Analog Devices (ADI)

Analog Devices is a leading global supplier of high-performance analog, mixed-signal and power management solutions. The LTC series of products was originally a Linear Technology brand and is now incorporated into the ADI system. As one of the core components of the isoSPI solution, the LTC6820HMS#TRPBF is widely deployed in electric vehicles, energy storage, battery monitoring and industrial control systems. It is ADI’s technical masterpiece in the field of electrical isolation communications.

Why Choose LTC6820HMS#TRPBF?

● Patented isoSPI technology, using only two wires to achieve fully isolated SPI communication

● Long communication distance, strong anti-interference ability, suitable for complex industrial and automotive wiring

● Support master/slave mode, flexible topology structure construction

● No need for additional isolation chip, reducing cost and layout complexity

● Support 1Mbps high-speed communication to meet real-time data transmission needs

● Compact package, support -40°C to +125°C industrial temperature environment

FAQ

Q1: Does the LTC6820 support communication with standard SPI devices?
Yes, it fully supports it. The LTC6820 is designed to convert standard SPI signals into isoSPI (isolated SPI) protocols to achieve reliable communication over long distances or in high-noise environments. The chip can be connected to a standard SPI host (such as MCU, FPGA) at one end, convert the signal into a single pair of differential isoSPI signals, and transmit it through a twisted pair for physical layer transmission; the remote end then decodes it back to a standard SPI interface through another LTC6820 to communicate with a regular SPI slave device. The entire process is transparent to the master and slave devices, and is fully compatible with the standard SPI protocol (up to 1Mbps), making it very suitable for scenarios such as distributed systems and BMS (battery management systems).

Q2: Is an external isolator required?
No additional digital isolation chip is required. The LTC6820 itself achieves electrical isolation through magnetic coupling, using a small transformer to transmit differential signals at both ends of the isoSPI interface. This design not only reduces system complexity and cost, but also significantly improves the anti-interference ability of communication. Users only need to configure a small communication transformer for each end (see the data sheet for recommended models) to complete isolation and communication transmission, without the need to use digital isolators such as the ADuM series, further saving PCB space and power budget.

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