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TPS23881: about SRAM and MSP430

Tommy Tzeng
Genius 4805 points
Part Number: TPS23881

Hi Sir,

could help reply the following question? thanks for your great support.

MCU MSP430F5234IRGZR can be omitted. (Yes or No)?
If no, whether to add SRAM on external?

We use TPS23881 need add the I2C SRAM component.

Q1. Because of the datasheet, TPS23881 SRAM 16K (Does it include the code size?)
PS1: how much space does the code occupy?
PS2: Can we plug-in Flash or SRAM to achieve Programmable and application? (Do you have an actual SRAM application data or design guide?)
PS3: If need use external SRAM, can you provide the relevant information? (Which brand and specification is the size of the SRAM used?)

Q2. SDAI and SDAO can be connected with non-Isolation. (Can you provide us with a reference design link?)

  • 0
    TI__Mastermind 40100 points

    Hi Tommy,

    There needs to be some host controller or MCU to drive the PSE and system software. If customer cannot create their own software, we recommend using TI's full system software solution called FirmPSE that uses the MSP430 you reference above.

    Yes the latest SRAM is needed with the TPS23881 to be compliant and interoperable.

    Q1) 16k is the amount of SRAM available in the IC. This means the SRAM patches provided by TI will be 16k or less.

    PS1) SRAM patch is ~10kB

    PS2) Yes I recommend looking at the TPS23881 technical documents in the link below.

    PS3) The above document gives guidance and link on where to download the latest SRAM patches.

    Q2) Majority of the designs will use isolation on I2C. This is to protect the host and MCU side from the high voltage at the PSE side. So unfortunately, we do not have a reference design with non-isolated I2C. However, I imagine you just need to remove the optoisolators and have the host or MCU drive the I2C bus of the PSE directly.