【经验】圣邦微电压电平转换器SGM4551无法双向转换分析

时间： 2023-02-09 来源：世强

技术问答

SGM4551是圣邦微的一款双通道双向I²C和SMBus电压电平转换器，支持输入工作电压范围为1.2V至3.3V VREF1和1.8V至5.5V VREF2。SGM4551允许在1.2V和5V之间进行双向电压转换，无需使用方向引脚。某用户在实际测试中反馈SGM4551无法实现双转换，并且波形毛刺明显，本文将分析并给出解决办法。

测试问题：

用SGM4551实现3.3V和5V双向转换，实际测试无法正常工作。原理图和测试波形见图1、图2：

图1

图2

解决办法：

检查原理图，发现VREF2和EN脚处电路图画法有问题，按照图1所示，VREF2未接上拉电阻R2，直接与5V连接，而SGM4551的VREF2脚是开漏输出类型，需要上拉才可以，改为下图3接法后，测试正常。

图3

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描述- SGMICRO specializes in high-performance and high-quality analog and mixed-signal integrated circuits, and is committed to building a comprehensive portfolio of the highest quality analog and mixed-signal integrated circuits to address all customer needs.

型号- 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型号- SGM4564YS14G/TR,SGM4564YS14,SGM4564,SGM4564YTQM12G/TR,SGM4564YUQN12G/TR

数据手册 - SGMICRO - REV. A. 1 - 2015年09月10日 PDF 英文下载

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型号- SGM4578YTQG20G/TR,SGM4578,SGM4578YTS20G/TR

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