ESP32 with 1.8V SPI flash Question

[Lucas.Hutchinson]

Hi All,

Sorry if this question has previously been asked and answered.

As I understand the ESP32 can be run with 1.8V external flash by having a pullup on the MTDI pin.

In out use case we are also using a separate SPI to interface with another 3.3v microcontroller.

My questions is:
Will pulling the MTDI pin high change all SPI interfaces to use 1.8V?

Meaning that the microcontroller we are interfacing to will also have to communicate at 1.8v

Thanks in advance.

[ESP_igrr]

Only the pins in VSDIO power domain will be affected.
Attached is the relevant part of the ESP32 Pin List document.

Screen Shot 2017-02-13 at 06.07.50.png (118.79 KiB) Viewed 5410 times