CMOS or TTL logic

[dmleone]

On the UART and I2C operations, are the input/output pins configured using CMOS or TTL logic levels? I am trying to design a test to test signal integrity and there are some range differences between the 2 logic levels and I cannot find the info

[awneil]

The logic levels are defined - in terms of VDD -  in the Product Specification:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/gpio.html?cp=3_1_0_19_3#unique_1820404704