STR9 - Inrush current on the VDD supply

jtual · ‎2014-07-29

Posted on July 29, 2014 at 16:52

Hi,

I have a issue with the power supplies of my electronic board at start up of microcontroller STR912FAW47. Someone know the inrush current of microcontroller on VDD (1,8V) and VDDQ (3.3V) at power on?

With an oscilloscope, it seems that the microcontroller starts to consume at the VDD treshold of 0,7V because I have an inrush current when the VDD supply is above 0,7V.

Thanks,

Jerome

Tesla DeLorean · ‎2014-08-02

Posted on August 03, 2014 at 05:13

Do you have NRESET/NRST clamped to ground at this point?

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jtual · ‎2014-10-08

Posted on October 08, 2014 at 12:04

No, the RST input is connected to pull up of 10K and a 100nF capacitor to the ground.