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Difference between LTC6820 and ADBMS6822

Category: Hardware
Product Number: LTC6820

Can someone please explain me what the difference between the LTC6820 is and ADBMS6822 ?

LTC6820 Demo board ( DC1941D ) is used to convert SPI signal to ISO-SPI.    EVAL-ADBMS6822 board also convert SPI to ISO-SPI.

What is the difference between these boards? 

The EVAL-ADBMS6822 evaluation board is a dual SPI to 2- wire isolated serial-port interface (isoSPI) adapter.  it is supporting reversible isoSPI support. what is the meaning of reversible isoSPI.

  • The parts perform the same functions with a few minor differences.  ADBMS6822 is newer and contains 2 transceivers in one QFN package rather than LTC6820 with a single transceiver in a QFP package.  The isoSPI current for ADBMS6822 is fixed at 25mA and threshold fixed at 300mV, avoiding the confusion of setting IBIAS and ICMP on LTC6820.  The common-mode range of the IP and IM pins is increased for both transmission and receiving of data on ABMS6822, allowing for more robust EMC performance when capacitor isolation is used.  ADBMS6822 supports LPCM monitoring if used with a new ADBMS6830B cell monitor or other cell monitor supporting LPCM.

    None of these differences impact the core functionality of translating SPI to isoSPI.  The parts perform the same function in the system and are both compatible with any isoSPI cell or pack monitoring IC.

  • what is the meaning of reversible isoSPI.

    This simply refers to there being 2x isoSPI ports on the IC, allowing the use of a ring-bus with the single IC to allow for full daisy-chain operation even with a single broken communication wire in the system.

    From the ADBMS6830B datasheet: