LTC6820

PRODUCTION

isoSPI Isolated Communications Interface

Data Sheet (Rev. C) Product Selection Table
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    Part Details

    • AEC-Q100 Qualified for Automotive Applications
    • 1Mbps Isolated SPI Data Communications
    • Simple Galvanic Isolation Using Standard Transformers
    • Bidirectional Interface Over a Single Twisted Pair
    • Supports Cable Lengths Up to 100 Meters
    • Very Low EMI Susceptibility and Emissions
    • Configurable for High Noise Immunity or Low Power
    • Engineered for ISO26262 Compliant Systems
    • Requires No Software Changes in Most SPI Systems
    • Ultralow, 2µA Idle Current
    • Automatic Wake-Up Detection
    • Operating Temperature Range: –40°C to 125°C
    • 2.7V to 5.5V Power Supply
    • Interfaces to All Logic from 1.7V to 5.5V
    • Available in 16-Lead QFN and MSOP Packages
    LTC6820
    isoSPI Isolated Communications Interface
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    Documentation

    Data Sheet 1

    Reliability Data 1

    User Guide 4

    Application Note 1

    Technical Articles 5

    Safety and Regulatory Compliance 1

    Learn More

    Hardware Ecosystem

    Parts Product Life Cycle Description
    Battery Monitors & Fuel Gauges 3
    LTC6804-1
    		PRODUCTION 12 Channel Multicell Battery Monitor with Daisy Chain Interface, Generation 3
    LT8584
    		RECOMMENDED FOR NEW DESIGNS 2.5A Monolithic Active Cell Balancer with Telemetry Interface
    LTC3300-1
    		RECOMMENDED FOR NEW DESIGNS High Efficiency Bidirectional Multicell Battery Balancer
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    Tools & Simulations

    IBIS Model 1

    Evaluation Kits

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    DC1941D

    LTC6820 isoSPI Demoboard (DC590B required)

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    Product Details

    Demonstration circuit 1941 is an isoSPI™ transceiver board, based on Linear Technology’s LTC6820. The LTC6820 provides a method of interconnecting standard serial peripheral interface (SPI) devices using a single twisted pair connection. This proprietary 2-wire interface is called isoSPI. The LTC6820 encodes SPI signals, up to 1Mbps, into a differential isoSPI signal which is transmitted via a simple pulse transformer through a twisted pair. At the other end of the twisted pair, the isoSPI signal can be translated back to SPI (using another LTC6820).


     


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    DC2100B-C

    12 Cell 4A Controller Board Bi-Directional Active Cell Balancer with LTC3300-1, LTC6804-2 and LTC6820

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    Product Details

    Demonstration Circuit DC2100B-D is a stackable, bidirectional cell balancer slave board using the LTC6804-2 and the LTC3300-1 ICs to achieve active balancing of up to 12 Li-Ion cells. It requires the DC2100B-C for proper operation. The DC2100B-D uses a single LTC6804-2 Multi-Cell Addressable Battery Stack Monitor IC to measure cell voltages and two LTC3300-1 Synchronous Flyback ICs to provide active cell balancing. The DC2100B-C controller board contains a PIC18F47J53 microcontroller, the LTM2884 isolated USB transceiver, the LTC6804-2, two LTC3300-1 ICs, and the LTC6820 isoSPI Interface IC to facilitate isolated communication. Up to seven DC2100B-D boards can be connected to a DC2100B-C to build a stacked system of eight total boards.

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    AD-CELLPACKBM-SL

    Cell and Pack Monitoring Kit for Broad Market Applications

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    Features and Benefits

    • Accurate voltage and current measurement
    • Highly scalable and ease of integration
    • Robust isoSPI capability implementable in daisy chain high count
    • Inclusive passive balancing with individual pulse-width modulation
    • Isolated power supply between microcontroller and battery monitoring devices
    • High voltage and current supply measurement
    • Fast overcurrent (OC) measurement
    • Redundancy measurement
    • Modular BMS Solution
    • Ready to use Broadmarket BMS GUI for Evaluation

    Product Details

    The AD-CELLPACKBM-SL is a complete BMS kit consisting of the EVAL-ADBMS6830BMSW 16-channel cell monitoring module, the EVAL-ADBMS2950-BASIC pack monitoring module, EVAL-ADBMS6822 isoSPI adapter, and a microcontroller board.​

    The AD-CELLPACKBM-SL can operate either in embedded mode or through a PC-based graphical user interface. Complete with working software and hardware, as well as software examples, this kit makes it easier for customers to prototype and create connected systems and solutions for BMS applications.​

    This package comes with the SDP-K1 as its MCU module, but the BMS components included in this kit are also compatible for use with other controller boards such as the AD-APARD32690-SL or MAX32690EVKIT.​

    Upon purchase, the AD-CELLPACKBM-SL kit comes with the following boards and accessories:​.

    Boards​

    • 2x EVAL-ADBMS6830BMSW 16-Channel Battery Cell Monitor (can be purchased separately)​
    • 1x EVAL-ADBMS2950-BASIC Battery Pack Monitor (can be purchased separately)​
    • 1x EVAL-ADBMS6822 Dual isoSPI Adapter (can be purchased separately)​
    • 1x EVAL-SDP-CK1Z (SDP-K1) Controller Board (can be purchased separately)​
    • 2x DC2472A Battery Cell Emulator (can be purchased separately)​
    • 1x MAX32625PICO Programming Adapter with 10-pin SWD cable (can be purchased separately)​

    Cables and Other Accessories​

    • 2x Cell Connector Block (18-cell connector)​
    • 3x DuraClik isoSPI Twisted Pair Cables​
    • 3x USB Type A to Micro-B Cable​
    • 3x Alligator Clip / Test Lead​

    APPLICATIONS

    • IoT Battery Management
    • Industrial Machine Vision
    • Power Tools
    • Mobile Robotics Battery Management
    • Industrial Equipment Battery Monitoring
    • Adaptive Battery Type System Monitoring
    • Portable Energy Storage Systems
    • Electric Two-Wheelers (E2W such as E-scooter, E-bikes)
    • Light Electric Vehicles

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    DC1907A

    OBSOLETE: LTC6820 isoSPI 2-Wire Serial Analyzer

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    Product Details

    This evaluation board is obsolete and no longer recommended. The replacement board is the DC1941D.

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    DC2617A

    LTC6820 Demo Board | Arduino Interface for isoSPI or Isolated CAN

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    Product Details

    Demonstration circuit 2617A implements the isoSPI and isolated CAN interface hardware on a single Arduino shield. It allows Arduino-compatible controller boards to communicate with isoSPI and/or CAN bus networks.

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    DC2792A

    OBSOLETE: LTC6820 Demo Board | Dual Master isoSPI Adapter

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    Product Details

    This evaluation board is obsolete and no longer recommended. The replacement board is the DC2792B.

    Demonstration circuit DC2792A is an SPI serial to dual-port isoSPI adapter that uses a pair of multiplexed LTC6820 isoSPI transceivers. The board can replace a DC1941 in cases where isoSPI battery-management (BMS) devices are being evaluated, but provides a second isoSPI master to exercise the reversible isoSPI feature where available. The SPI interface can be provided via the legacy 14-contact ribbon cable from either a DC590 or DC2026 USB adapter, or directly installed on the DC2026 as a Linduino ‘shield’. The two isoSPI ports are MAIN and AUXiliary, with activity of each indicated by blue LEDs. For use in place of DC1941, the MAIN port must be used. Power for the DC2792A comes indirectly from the USB port of the host computer, via the USB to serial adapter being used.

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    DC2792B

    LTC6820 Demo Board | Dual Master isoSPI Adapter

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    Product Details

    The demonstration circuit DC2792B is an SPI serial to dual-port isoSPI adapter that uses a pair of multiplexed LTC6820 isoSPI transceivers and miniaturized isoSPI connectors (2 contact DuraClik). The board can functionally replace a DC1941 in cases where isoSPI battery-management (BMS) devices are being evaluated, but provides a second isoSPI master to exercise the reversible isoSPI feature where available. The SPI interface can be provided via the legacy 14-contact ribbon cable from either a DC590 or DC2026 USB adapter, or directly installed on the DC2026 as a Linduino shield. The two isoSPI ports are MAIN and AUXiliary, with activity of each indicated by blue LEDs. For use in place of DC1941 or non-reversible isoSPI networks, the MAIN port must be used. Power for the DC2792B comes indirectly from the USB port of the host computer, via the USB to serial adapter being used.
    DC1941D
    LTC6820 isoSPI Demoboard (DC590B required)
    DC2100B-C
    12 Cell 4A Controller Board Bi-Directional Active Cell Balancer with LTC3300-1, LTC6804-2 and LTC6820
    AD-CELLPACKBM-SL
    Cell and Pack Monitoring Kit for Broad Market Applications
    DC1907A
    OBSOLETE: LTC6820 isoSPI 2-Wire Serial Analyzer
    DC2617A
    LTC6820 Demo Board | Arduino Interface for isoSPI or Isolated CAN
    DC2792A
    OBSOLETE: LTC6820 Demo Board | Dual Master isoSPI Adapter
    DC2792B
    LTC6820 Demo Board | Dual Master isoSPI Adapter

    Reference Designs
    CN0410
    Programmable, 3-Channel LED Current Source Driver with isoSPI Repeater

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