Clarification for CHIP_PU voltage levels

[SomeCallMeTim]

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]

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.