Clarification for CHIP_PU voltage levels

SomeCallMeTim
Posts: 12
Joined: Fri Sep 01, 2017 3:50 pm

Clarification for CHIP_PU voltage levels

Postby SomeCallMeTim » Mon Apr 20, 2020 3:33 pm

Hello -

For CHIP_PU, the datasheet states:
  • High: On; enables the chip
  • Low: Off; the chip powers off
  • Note: Do not leave the CHIP_PU pin floating.
What voltage is "high" to enable the chip? Typically it'd be something like 75% of VDD, but the diagrams for Vil_nrst (such as "Figure 5: ESP32 Power-up and Reset Timing") seem to indicate that it just matters that it's above 0.6V.

(We're curious if it's okay for CHIP_PU to be set to 1.8V when it's on.)

Thanks,
Tim

ESP_Sprite
Posts: 9761
Joined: Thu Nov 26, 2015 4:08 am

Re: Clarification for CHIP_PU voltage levels

Postby ESP_Sprite » Tue Apr 21, 2020 7:52 am

Datasheet seems pretty clear in that reset needs to be >0.6V, so from what I can see there's all indication that 1.8V should work.

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