Single/Dual isoSPI Transceiver

Show More showmore-icon

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 4
1ku List Price Starting From $3.36
  • Up to 2 Mbps isolated bidirectional serial data communications
  • Drop in compatible: single (ADBMS6821) and dual (ADBMS6822)
  • Fully independent dual transceivers (ADBMS6822)
  • Simple galvanic isolation using capacitors or transformers
  • Bidirectional interface over a single twisted pair
  • Supports cable lengths up to 100 meters
  • Very low EMI susceptibility and emissions
  • LPCM support for Analog Devices battery monitors
  • Interrupt output for LPCM system wake-up
  • 4 Mbps unidirectional mode
  • Requires no software changes in most SPI systems
  • Ultralow idle current
  • Automatic interface wake-up detection
  • Operating temperature range: –40°C to +125°C
  • 3.0 V to 5.5 V isoSPI driver power supply
  • 1.7 V to 5.5 V interface to microcontrollers
  • 3.0 V to 30 V input for powering wake-up and monitoring functions (12 V battery compatible)
  • Available in 32-lead, side solderable LFCSP package
  • AEC-Q100 qualified for automotive applications
Additional Details
show more Icon

The ADBMS6821 (single) and ADBMS6822 (dual) provide bidirectional isolated serial port interface (isoSPI) communications between two isolated devices through a single twisted pair connection for each data link. Each transceiver encodes logic states into signals that are transmitted across an isolation barrier to another transceiver. The receiving device decodes the transmission and drives the slave bus to the appropriate logic states. The isolation barrier can be bridged by capacitors or by a pulse transformer to achieve hundreds of volts of isolation.

The ADBMS6821/ADBMS6822 transceivers drive differential signals using matched source and sink currents, eliminating the requirement for a transformer center tap and reducing electromagnetic interference (EMI). Precision window comparators in the receiver detect the differential signals.

The transceivers can be paired with advanced Analog Devices, Inc., battery stack monitors to enable cell voltage and sensor monitoring even while the system controller is powered down (low power cell monitoring, or LPCM). The transceivers provide a timeout function that wake up or alert the system when a pass heartbeat message has not been received in the programmed time period.

Throughout the data sheet, all pin names refer to both transceivers on the ADBMS6822. For example, VDD refers to both VDD and VDD2.


  • Electric and hybrid electric vehicles
  • Backup battery systems
  • Industrial networking
  • Remote sensors
Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA). Send your project details, company information and contact by e-mail to Additional support is available from your Analog Devices local sales.
Part Models 4
1ku List Price Starting From $3.36

close icon


Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
  • HTML
  • HTML
  • HTML
  • HTML
  • HTML
  • HTML
  • HTML
  • HTML
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image


Evaluating the ADBMS6822 Dual isoSPI® Adapter



Evaluating the ADBMS6822 Dual isoSPI® Adapter

Evaluating the ADBMS6822 Dual isoSPI® Adapter

Features and Benefits

  • Full-featured evaluation board for the ADBMS6822 
  • Demonstrates SPI to isoSPI 2-wire datalinks
  • Includes two isoSPI ports for reversible isoSPI support
  • Configurable powering options for LPCM support isoSPI connections through simple DuraClik® connectors
  • Compatible boards EVAL-ADBMS68xx, battery monitor boards EVAL-SDP-CK1Z, controller board
  • PC software for control and data analysis when used with the Analog Devices, Inc., SDP-K1 microcontroller

Product Detail

The EVAL-ADBMS6822 evaluation board is a dual SPI to 2- wire isolated serial-port interface (isoSPI) adapter featuring the ADBMS6822. Multiple ADBMS68xx battery monitors can be linked through daisy-chain interconnections. The EVAL-ADBMS6822 evaluation board also features reversible isoSPI, which enables a redundant communication path to the peripheral units. The PCB, components, and DuraClik™ connectors are optimized for low electromagnetic interference (EMI) susceptibility and emissions.

The EVAL-ADBMS6822 evaluation board can communicate to a PC by connecting together with EVAL-SDP-CK1Z. The EVALADBMS6822 evaluation board provides a standard SPI, which can be translated to isoSPI and then onward to a peripheral device or daisy chain as applicable.

The EVAL-ADBMS6822 evaluation board can also be used to evaluate the ADBMS6821. Note that, for the ADBMS6821, there is only one SPI port; therefore, ignore the second SPI port and auxiliary isoSPI port when using the ADBMS6821.

Full specifications on the ADBMS6822 dual isoSPI adapter are available in the ADBMS6821/ADBMS6822 data sheet available from Analog Devices, Inc., and must be consulted with this user guide when using the EVAL-ADBMS6822 evaluation board. Design files for this circuit board are available at Design Center.

Recently Viewed