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Original question:

TPS23881: Measure Power Consumption with TPS23881

TPS23881: Measure Power Consumption with TPS23881

Jesus Manuel Llaiqui Florez
Prodigy 40 points
Part Number: TPS23881

Tool/software:

I need to determine if the SRAM on TPS23881 needs to be loaded every time the microcontroller starts or if it can be initialized just once.

  • 0
    TI__Genius 14745 points

    Hi Jesus,

    SRAM is volatile memory, therefore SRAM needs to be loaded every time the PSE loses power. This should be independent of MCU reset, however if you MCU and your PSE are derived from the same power source, then yes you would need to load everytime.

    Regards,

    Brandon

  • 0 in reply to Brandon Beader
    Prodigy 40 points

    Hi Brandon

    I need assistance with configuring and reading from ports 5 and 6 of the TPS23881 when using a 4-Pair Single Signature PD setup.

    1. Configuration: How can I configure the TPS23881 ports to utilize 4-Pair Single Signature PD?
    2. Readings: How should I perform the readings in this setup?
    In the demonstration code, the readings are performed individually for each port. However, for a 4-Pair Single Signature setup using two ports of the TPS23881, how should the readings be conducted?

    Regards,

    Jesus Manuel

  • 0 in reply to Jesus Manuel Llaiqui Florez
    TI__Genius 14745 points

    Hi Jesus,

    1. Your configuration for a 4-pair single singature AP, the TPS23881 should be setup in 4-pair configuration with two channels of the PSE correctly connected to the port, to support a 4-pair port. Please see schematic below for the connection on these channels. 

    In addition, your Port Power Allocations (Register 29h) need to reflect your power support at the port. 

    2. I would recommend following the TPS23881 reference code available on TI.com for how to handle detection and classification, however your control loop should remain the same, you would just add an "if condition" for 4-pair connected ports to read detection and classification results and power on the subsequent channels accordingly . 

    Regards,

    Brandon