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Electronics => Projects, Designs, and Technical Stuff => Topic started by: ricko_uk on December 28, 2024, 03:47:18 pm

Title: E-Fuse signals referenced to RTN and not GND but GND and RTN are connected?
Post by: ricko_uk on December 28, 2024, 03:47:18 pm

Hi,
I am thinking of using the TPS26600 e-fuse (datasheet links below for both the dev kit and the IC itself).

In the datasheet a lot of input signals look like they are referenced to pin RTN (labelled as "Reference for device internal control circuits").

In the block diagram on page 18 of the IC datasheet it looks like RTN is connected to GND, which makes sense. But in the description it says to connect various signals to RTN not GND, and in the Dev Kit schematic (page 3 of the dev kit datasheet) it also shows most of the signals connected to RTN which is isolated from GND.

It doesn't make much sense. Why not allow to connect/reference the signals to GND if they are connected anyway inside the IC (if I read the datasheet correctly)?

IC Datasheet: https://www.ti.com/lit/ds/slvsdg2g/slvsdg2g.pdf?ts=1735388589544&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTPS26600-02EVM (https://www.ti.com/lit/ds/slvsdg2g/slvsdg2g.pdf?ts=1735388589544&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTPS26600-02EVM)

Dev Kit Datasheet: https://www.ti.com/lit/ug/slvuav3a/slvuav3a.pdf?ts=1735371264696 (https://www.ti.com/lit/ug/slvuav3a/slvuav3a.pdf?ts=1735371264696)

Thank you :)

Title: Re: E-Fuse signals referenced to RTN and not GND but GND and RTN are connected?
Post by: uer166 on December 28, 2024, 09:44:55 pm

It does not show them connected together. The absolute max rating also obviously shows that they're not.

Title: Re: E-Fuse signals referenced to RTN and not GND but GND and RTN are connected?
Post by: ricko_uk on December 30, 2024, 06:48:34 am

Thank you uer166,
I misinterpreted the meaning of that block in the diagram.