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SN1701022 || PIN_ALT funtionality

Hi Team  

We  are  using  SN1701022 in one of  our  design , in datasheet  page no  5  it is  written that PIN_ALT  will asserts  low  when power reaches  "PWR_IN_alert " SVID  register, 

1) Does  these  register  can be  acesses  by  fusion Digitial power  designer  ?

2) If  this  pin will be  asserted  when volatge for  both channel will reach to  Progrmmed  value  or  single  channel

  • Hi Abhishek,

    1. No, this should be set by the processor.

    2. Its based on input power. If using sensed Iin, input power will be determined by both rails combined, as well as any other load after the input shunt. If using calculated Iin, you can choose whether you want to include the 2nd rail power in the GUI.

    Thanks,

    Travis

  • Hi  Travis  
    thanks  for  for  quick  response  . What is  difference  between sensed  lin and  calculated  lin . Can  you  please  share  me  some  litreture  or  more  details  about this  ?

  • Hi Abhishek,

    Sensed Iin uses a current sense resistor and measures the voltage across it. To do this, you use pins 37 & 38. This allows for accurate input current sensing.

    Alternatively, most customers use calculated Iin because it is cheaper & more efficient (no input shunt). This measures the output voltage, output current, and input voltage, then makes an assumption about efficiency to calculate the input current. This method is less accurate.

    You can choose between calculated & sensed Iin in Fusion GUI, under the telemetry tab.

    Go to page 55 of the datasheet for more information if desired.

    Thanks,

    Travis