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Visitor II
June 8, 2006
Question

ADC connections if not used, RTC VBATT connection

  • June 8, 2006
  • 4 replies
  • 812 views
Posted on June 08, 2006 at 12:33

ADC connections if not used, RTC VBATT connection

    This topic has been closed for replies.

    4 replies

    sab964Author
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:30

    Hello,

    I'm working on a design with the 128 pin STR912FW44X6.

    I don't need to use the internal ADC(but I want to use GPIO Port 4 as general purpose I/Os). Are there any recommendations for connections to the pins AVSS, AVDD and AVREF ?

    I want to use the RTC but don't need to supply power to the RTC Unit when

    the main digital supplies (VDD and VDDQ) are switched off. Can I tie VBATT to GND oder are there other recommendations ?

    Thank you in advance,

    Sascha

    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:30

    Hi Sascha,

    I don't have the correct answer right now, I will ask and I will let you know rapidly.

    Best regards,

    STARM ;)

    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:30

    Hi Sascha,

    Please find the answers to your questions:

    1- connect the AVDD, AVREF to VDDQ and AVSS to VSS

    2- When not using battery for RTC, please connect the VBATT pin to VDDQ (do not connect to ground).

    Best Regards,

    STARM

    sab964Author
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:30

    Thank you very much!