ltc4291 vs 4291-1

What's the difference?

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  • +1
    •  Analog Employees 
    on Oct 31, 2018 4:54 PM

    The LTC4291-1/LTC4292 chipset comes preloaded (in ROM) with version 1.6 firmware. Firmware version 1.6 is fully qualified as IEEE compliant.  When using the LTC4291-1 with the default firmware no code download is required and IEEE compliant operation can be run autonomously. However, it is recommended that early 802.3bt PSE systems be capable of field upgrade (via firmware download).

    Firmware updates must be re-downloaded following any LTC4291-1 power cycle. Code is downloaded to RAM. RAM contents are volatile, meaning the RAM download will not be preserved when 3.3V power is lost. Moving forward, the LTC4291-1 is recommended for all new designs.

    The LTC4291/LTC4292 chipset is released, but does not come preloaded with firmware and requires code download. A fully compliant IEEE firmware image, version 1.6, is available and fully qualified. The LTC4291, though not suggested for new designs, will remain available for existing customers.

    For the LTC4291, a code download must be performed at every power cycle. Code is downloaded to RAM. RAM contents are volatile, meaning the RAM download will not be preserved when 3.3V power is lost.

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  • +1
    •  Analog Employees 
    on Oct 31, 2018 4:54 PM

    The LTC4291-1/LTC4292 chipset comes preloaded (in ROM) with version 1.6 firmware. Firmware version 1.6 is fully qualified as IEEE compliant.  When using the LTC4291-1 with the default firmware no code download is required and IEEE compliant operation can be run autonomously. However, it is recommended that early 802.3bt PSE systems be capable of field upgrade (via firmware download).

    Firmware updates must be re-downloaded following any LTC4291-1 power cycle. Code is downloaded to RAM. RAM contents are volatile, meaning the RAM download will not be preserved when 3.3V power is lost. Moving forward, the LTC4291-1 is recommended for all new designs.

    The LTC4291/LTC4292 chipset is released, but does not come preloaded with firmware and requires code download. A fully compliant IEEE firmware image, version 1.6, is available and fully qualified. The LTC4291, though not suggested for new designs, will remain available for existing customers.

    For the LTC4291, a code download must be performed at every power cycle. Code is downloaded to RAM. RAM contents are volatile, meaning the RAM download will not be preserved when 3.3V power is lost.

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