NHD-2.4-240320CF-CTXI#-F spec on VDDIO

mjhuslig

• November 19, 2016 14:07

I want to use the NHD-2.4-240320CF-CTXI#-F in a battery application.  The uP and VDDIO connected to the battery and VDD connected to a charge pump controlled by the uP.  When the unit is off, the uP turns off the charge pump and goes to sleep.  Can VDDIO be left powered while VDD is off?  What is the current draw on VDDIO if it were left powered?

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  Saurabh_B

  • November 22, 2016 14:07

  Hello,
  
  We often recommend tying the VDDIO to the VDD pin.
  The 3.3V is still within the safe operating voltage for the Controller IC.
  
  According to the Datasheet (Page 131), the VDDIO needs to be powered down before the VDD.
  Datasheet: http://www.newhavendisplay.com/app_notes/ST7789S.pdf
  
  Because of these we have not tried to test power drain while VDD is not applied.

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