1. Introduction
This article mainly introduces the principle of the IIC level conversion circuit, and records and summarizes it.
Two, preparation knowledge (chip introduction AW39114BQNR)
Log in to the official website, search for the name of the chip, and view the corresponding chip manual.
Chip introduction:
Typical application circuit:
2. Schematic introduction
MCU pin output "MCU_SCL1, MCU_SDA1":
IIC bus pull-up circuit:
IIC level conversion circuit:
working principle:
1. When the OE pin is at high level, the AW39114 chip works;
2. When the VCCA level is 1.8V, the MCU Convert the incoming 3.3v signal to 1.8v.
3. If you want to do 3.3v-1.8v and 3.3v-3.3v at the same time, you can choose whether the VCCA level is 1.8v or 3.3v by jumping the cap.
Three, summary
This article mainly introduces the working principle of using AW39114 chip to do IIC level conversion, for reference. Welcome to discuss and exchange~