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    What if BMP581 CSB pin it tied LOW (VSS, VSSIO)?

    BWX
    New Poster

    What if BMP581 CSB pin it tied LOW (VSS, VSSIO)?

    Regarding BMP581 data sheet v1.2, in section 5.1 for I2C communications it recommends hard-wiring CSB to VDDIO. Later in that section it describes disabling I2C if CSB transitions, which it would not if hard-wired. In section 6.2.3 I2C wiring diagram, it states CSB can be connected to VDDIO or VSSIO. Can operation be described when CSB is tied to VSSIO?

    4 REPLIES 4
    BSTRobin
    Community Moderator

    Re: What if BMP581 CSB pin it tied LOW (VSS, VSSIO)?

    Hi BWX,

    What is the hardware communication interface you used? I2C, I3C, SPI?

    FAE_CA1
    Community Moderator

    Re: What if BMP581 CSB pin it tied LOW (VSS, VSSIO)?

    Hi BWX,

    Thanks for your inquiry.

    If BMP581 CSB pin is tied LOW (VSS, VSSIO), then neither SPI nor I2C/I3C interface will work.

    BMP581 CSB pin has internal pull-up resistor. For I2C or I3C interface, CSB pin needs to be tied to VDDIO by either hard-wiring to VDDIO with internal pull-up resistor disabled or enabling the internal pull-up resistor without being tied to VDDIO. Therefore, BMP581 datasheet Section 6.2.3 has a typo. It says << Leave open (trim_i2c_csb_pup_en = b1) or connect to VDDIO or VSSIO (trim_i2c_csb_pup_en = b0)>>. It should be << Leave open (trim_i2c_csb_pup_en = b1) or connect to VDDIO (trim_i2c_csb_pup_en = b0)>>. We will fix the typo in the new version of BMP581 datasheet.

    Thanks.

    BWX
    New Poster

    Re: What if BMP581 CSB pin it tied LOW (VSS, VSSIO)?

    The target interface is I2C.

    BWX
    New Poster

    Re: What if BMP581 CSB pin it tied LOW (VSS, VSSIO)?

    That explains it, thanks!

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