简单的逻辑电平转换接口1.8V的微控制器和3V外设

摘要：一个3V外设接口1.8V的微控制器，构成了设计上的挑战，因为微控制器的逻辑输出不能满足外围设备的VIH和VIL要求。需要使用一个逻辑电平转换接口的两个设备。接口电路，可以组成一个简单的电阻和二极管或集成逻辑电平转换。
Maxim > App Notes > AUDIO CIRCUITS

Keywords: interfacing, interface, level translator, 1.8V to 3V, logic level, micro controller, microcontroller May 11, 2005

APPLICATION NOTE 3498
Simple Logic-Level Translation Interfaces 1.8V Microcontrollers and
3V Peripherals

Abstract: Interfacing a 1.8V microcontroller to a 3V peripheral poses a design challenge, because the logic
output of the microcontroller cannot satisfy the peripheral's VIH and VIL requirements. A logic-level translator
needs to be used to interface the two devices. The interface circuit can consist of a simple resistor and diode
or an integrated logic-level translator.

Microcontrollers (Cs) powered from 1.8V cannot meet the VIH requirements of peripheral devices that have
typical CMOS inputs and are powered from 3V. Genera