【应用】国产8位非逆变双向电平转换芯片SGM4578助力车载OBU项目，可建立混合电压系统之间的数字开关兼容性

时间： 2022-07-14 来源：世强

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8位非逆变双向电平转换芯片,双向电压电平转换器,8位非逆变转换器,SGM4578

OBU是电子标签的俗称，应用在高速公路不停车收费系统（ETC）中。在ETC系统中，车载单元/车载电子标签（OBU）是安装在车上的部分，通过专用短程通信技术(DSRC)，与路边单元（RSU）通过微波进行通讯，从而识别真假，获得车型，计算费率，扣除通行费。从而实现车辆在过高速公路时，装上OBU的车辆可以实现不停车扣费。

某客户做车载OBU项目，在与后台进行数据互传时，使用到了一款蓝牙SOC来实现。其中主控MCU和蓝牙芯片的电压分别为3.3V和1.8V，即电平不一致。为了保证正常工作时，两个芯片之间能够进行正常通信，就需要使用到一款电平转换芯片。本文推荐圣邦微电子（SGMICRO）的SGM4578，这种8位非逆变转换器是一种双向电压电平转换器，可用于建立混合电压系统之间的数字开关兼容性。车载OBU应用框图如图1所示。

图1.车载OBU应用框图

8位非逆变双向电平转换芯片SGM4578典型应用电路图如图2所示。可以看出，它使用两个独立的可配置电源轨，A端口支持1.65V到5.5V的工作电压，同时跟踪VCCA电源，B端口支持2.3V到5.5V的工作电压，同时跟踪VCCB电源。这允许支持更低和更高的逻辑信号电平，同时在1.8V、2.5V、3.3V和5V电压节点之间提供双向转换能力。

图2.典型应用电路图

除此之外，当输出使能（OE）输入较低时，所有I/O都处于高阻抗状态，这显著降低了电源的静态电流消耗。只要VCCA通电，OE就有一个内部下拉电流源。为了确保在通电或断电期间的高阻抗状态，OE应通过下拉电阻器连接到GND，电阻器的最小值由驱动器的电流源能力决定。

综上所述，SGM4578性能优异，完全满足不同电平芯片之间转换的项目的应用。该芯片平台库存大，供货稳定，且可以提供相关的技术支持，是一个不错的选择。

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SGMICRO（圣邦微）信号链和电源管理芯片选型指南

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.

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型号- SGM2594CD,SGM48757,SGM48111,SGM8544,SGM853,SGM452,SGM450,SGM2564,SGM2522A,SGM2594BD,SGM812C,SGM2040-3.3,SGM48220,SGM836,SGM61220,SGM8773,SGM2591B,SGM8252,SGM2591C,SGM8770,SGM2591A,SGM4578,SGM2553,SGM2036,SGM2575A,SGM809B,SGM48017,SGM2592AD,SGM803B,SGM2580F,SGM259X 系列,SGM2580G,SGM2580D,SGM2580E,SGM61430,SGM2580K,SGM2580I,SGM2592C,SGM2580B,SGM2580,SGM2580C,SGM2592A,SGM8713A,SGM2592B,SGM2580A,SGM8713B,SGM3157,SGM2576B,SGM2588,SGM66051,SGM2207,SGM802B,SGM25701,SGM61280,SGM40642,SGM25661,SGM2572,SGM7220,SGM2571,SGM485211,SGM4995,SGM2574,SGM2210,SGM8958,SGM2576,SGM706B,SGM2212,SGM25701B,SGM8558,SGM72204,SGM7227,SGM8955,SGM25701A,SGM7229,SGM8956,SGM809,LM2904,SGM2591AD,SGM803,SGM804,SGM2592CD,SGM61135,SGM801,SGM802,SGM40666S,SGM2594A,SGM810,SGM2594B,SGM811,SGM41518,SGM41512,SGM2594C,SGM6602,SGM4027,SGM2521,SGM259X,SGM7200X,SGM2523,SGM2566B,SGM2522,SGM2566C,SGM3699,SGM2525,SGM2578A,SGM2566A,SGM2528A,SGM41511,SGM61020,SGM2592BD,SGM48541,SGM2590,SGM2592,SGM2591,SGM2594,SGM2593,SGM2596,SGM3206,SGM37892,SGM4535,SGM2567A,SGM811C,SGM2594AD,SGM851A,SGM851B,SGM2539,SGM708,SGM829,SGM41542,SGM41543,SGM42633,SGM827,SGM706,SGM828,SGM851C,SGM825,SGM61232,SGM826,SGM48211,SGM2591CD,SGM823,SGM824,SGM2572A,SGM40666AS,SGM2572B,SGM2584A,SGM2572C,SGM431,SGM460141,SGM2528B,SGM2528C,SGM2028,SGM3756,SGM810B,SGM2527,SGM2526,SGM48524D,SGM818,SGM816,SGM25062,SGM814,SGM2591BD,SGM815,SGM812,SGM8270N,SGM821,SGM8967-1,SGM40666BS,SGM8477,SGM41528,SGM8631,SGM708-S,SGM820,SGM708-T,SGM8197,SGM708-R,SGM8750,SGM4066X,SGM708-M,SGM6610,SGM708-L,SGM2531,SGM2521A,SGM2534,SGM708-J,SGM2533

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