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mail13
Visitor II
January 25, 2008
Question

STR751 ADC and Power Supply Question

  • January 25, 2008
  • 2 replies
  • 732 views
Posted on January 25, 2008 at 08:24

STR751 ADC and Power Supply Question

    This topic has been closed for replies.

    2 replies

    M
    mail13Author
    Visitor II
    January 25, 2008
    Posted on January 25, 2008 at 07:05

    I need some help to understand the datasheet of the STR751 ARM, because some sentences are very unclear:

    There is said that the VDDA_ADC and VSSA_ADC pins are the analog power supply of the A/D converter cell, but how can I set the reference-Voltage? I need 0-5V Measurement.

    There is a chapter named ''Power supply schemes'' but there is nothing said about the STR751-µC -> Does it work with 5V?

    Can I set VDDA_ADC higher than VDD_IO?

    Why is USB disabled in 5V-Mode?

    J
    jgoril
    Visitor II
    January 25, 2008
    Posted on January 25, 2008 at 08:24

    Reference manual says that VDDA_ADC must be equal to VDD_IO. Since it is ''sensitive'' supply, you can use better filtering for this pin. That's all...

    I'm in doubt whether you will find any answer for your second question - Why is USB disable in 5V mode...

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