【经验】基于双向电压电平转换器SGM4556解决渗漏检测仪5V转3.3V数据传输问题
单片机有多种电压等级,1.8V、3.3V、5V等等,对应的各种芯片也是有不同的电压等级。单片机之间、单片机和芯片之间的数据通讯让开发者费尽心思。由于耐受压电不同,不同等级电压的芯片之间通讯时需要搭建各种电压等级的转换电路,来实现通讯,并且转换效率不高,波形变形,极易造成数据丢失。文中主要介绍笔者在项目中做3.3v芯片和5v单片机之间的数据传输时遇到的问题和解决办法。
笔者参与渗漏检测仪的项目设计,需要使用E931.96芯片进行人体的检测,但是由于笔者使用的是5v的单片机,而E931.96使用电压为3.3V,根据资料5v的单片机需要对3.3V的芯片写指令已完成某些功能。因此需要将5V的数据转换为3.3V。首先想到的最简单的电路是使用电阻分压的方法,原理图如下:
图1 电阻分压法5V转3.3V电路原理图
此方法理论可行实际使用中发现单片机输出的波形和分压后输出的波形不一致,单片机给出的波形为方波,分压后得到的波形发生了变形。如下图:
图2 单片机输出波形
图3 电阻分压法分压后波形
但是E931.96芯片是采用非标准通讯协议,因此对波形时序要求很严格,电阻分压法波形变形严重,芯片读取到的信息为错误信息。因此需要使用更好的办法。了解到世强代理的圣邦微电子有一款专门用于双向电压电平转换器,可以应用于不同电压等级芯片之间的数据传输,数据传输速度最高可达100Mbps。于是申请了样品测试。
图4 SGM4556电压电平原理图
图5 使用SGM4556电平转换后的波形图
从波形图中可以看出,双向电压电平转换器SGM4556电平转换中之后的波形几乎没有发生形变。数据完全可以被E931.96接收到,并正确识别。
双向电压电平转换器SGM4556可以支持A端口1.2V到5V和B端口1.65到5.5V的宽范围电压,值得注意的是VCCA≤VCCB。并且SGM4556具有使能控制功能,可以通过控制OE,改变输入输出状态。SGM4556采用超低功耗设计,最低静态电流仅0.1uA。-40到85℃的工作温度范围,使其可以更好的适用于工业用场所。良好的性能使得SGM4556可以广泛应用于UART和GPIO的数据通讯功能,解决了不同电压等级之间的数据传输问题。
总结双向电压电平转换器SGM4556典型特点:
• 端口为1.2V至5.0V,B端口为1.65V至5.5V(VCCA≤VCCB)
• VCC隔离:如果VCC处于GND时,则所有输出均处于高阻状态
• OE输入电路取决于VCCA
• 低功耗,最低静态电流仅0.1uA
• 推拉输出,拥有更好的驱动能力
• IOFF:支持部分掉电模式操作
• -40℃至+ 85℃工作温度范围
• 提供绿色XTDFN-1.4×1-8L和SOT-23-8包装
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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.
型号- 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
SGMicro(圣邦微)-TI/ADI/ON产品对照表
型号- OPA335,OPA698,SGM8273-1AXN5,OPA2364,OPA330,SGM8955XN5G/TR,AD8605ARTZ,SGM724,LMV821M7 NOPB,SGM8199A3XC6G/TR,OPA2357,SGM80582XS8G,OPA2355,OPA2354,SN74LVC1G08DCKR,TPS61240,SGM8261-2,74LVC1G32GW,LMP2021MF/NOPB,AD8531ART,LM7301IM5 NOPB,OPA2350,SGM8094,MC33272ADR2G,SGM8091,SGM8092,SGM8093,SGM722,ADTL084,TLV3542,OPA376AIDCKR,TLV3541,LMC7660,SGM810-SXN3/TR,NCV33274ADR2G,OPA2170AIDGKR,AD8629ARMZ-REEL,SGM809-SXN3/TR,OPA364IDBVR,SN74LV4051,SGM8557-1XN5,TS321IDBVR,SGM8270-2XS8G/TR,TLV3544,SN74LVC1G00DCKR,IMP809T,IMP809S,IMP809M,SGM8770XS8G/TR,SGM8416-1,SGM8957-1XN5G/TR,SGM8416-2,TLV271IDBVR,ADM708SARZ,SGM8271BYN5G/TR,TPS73433DDCR,SGM809-RXN3L/TR,AF809N293MR-3,AD8091,SGM7SZ125YC5G/TR,SGM58031,AD8094,AD8093,AD8092,SGM8273-2,LT1797CS5#TRMPBF,SN74AHCT1G125D,SGM8273-4,OPA2365,SGM8273-1,SGM809-XXN3/TR,AME8500AEETAF31Z,74AVCH8T245PW,OPA376,SGM8557-3,LMV321IDBVR,SGM8557-1,SGM8557-2,LMH6611MKX/NOPB,SGM7SZ00YN5G/TR,SGM809-SXN3L/TR,AD8062,AD8061,SGM721XS/TR,OPA330AIDBVR,AD8063,SGM42609,AME8500AEETAF44Z,PT7M7810STEX,SGM7SZ08YN5G/TR,SGM8541XN5/TR,INA214B,SGM7SZ04YC5G/TR,LM358,SGM8957-2XMS8G/TR,TXB0104RUTR,NCS20074DTBR2G,SN74LVC1G3157DCKR,LMV324,TL343,OPA3355,SGM8270-2,SGM8270-4,OPA357,OPA2188,OPA354,OPA355,SGM61230,SGM8558-1,SGM8301YN5,NCS199A2SQT2G,OPA350,OPA4357,SGM8T245XTS24G/TR,OPA2171,OPA4354,SGM2205-3.3XKC3G/TR,SGM8210-1AXN5G/TR,OPA365,OPA4350,TSV321RILT,TLV4333,TL082IDR,AD8051,AD8055,AD8054,AD8053,LMV934MTX/NOPB,AD8052,LMV824DR2G,SGM721XN5/TR,SGM8255A-1XN5G/TR,SGM8274YTS14G/TR,SGM2040-3.3YUDH4G/TR,MC33202,UA78M33CKCS,LMV358,SN74LVC1G32DCKRE4,SGM2036-3.3YN5G/TR,OPA4170AIDR,SGM8557-1AXN5G,SGM8622XMS/TR,LP2980,MC33179DR2G,SGM809-1.63V,SGM8255A-2XS8G/TR,SGM8551XN5,TLV2171,SGM8740YN5,SGM8273-2XS,LM393,SGM8632C,SGM8273-1AXN5G/TR,ADM706SARZ,LMV822MMX/NOPB,ISL28290FBZ-T7,AD8615_6,TLV274IPWR,AD8666ARMZ-REEL,OPA172IDBVR,SGM8965,MC33178DR2G,SGM8604,MCP6004T-E/ST,TLC2272,LM258,SGM7SZ245XTS20G/TR,LMV393,TL082,SGM8965-2,SGM8965-1,INA199A1DCKR,MCP6561T-E/OT,SGM8957,SGM8959,SGM8955,OPA2320,TPS54218ARTE,LM2904,AD8614ARTZ-R2,SGM3749YTDI6G/TR,SGM811-SXKA4/TR,TPS61165,OPA2171AIDGKR,SGM4564YUQN12G/TR,LMC6482AIMX NOPB,TPS61160,SGMOP07EXS8G/TR,SGM8557-2XS8G/TR,MAX4239,SGM7SZ08YC5G/TR,SGM3157YC6/TR,TS321ILT,OPA2301,SGM8210-2XMS8G/TR,"SGM8255A-1XN5G/TR SGM8425AYN5G/TR",SN74LVC1G14DBVRG4,VIC5111-293BDI,TPS54202,SGM8552XMS8G/TR,TSZ122IST,ISL28177,STR8293-263BSI,OPA2335,TLV272IDGKR,MC74HC1G04DFT2G,OPA365AIDBVR,SGM8557-1AXN5G/TR,SGM8631,SGM8632,SGM8554XTS14G/TR,LSP2200CALS,AP7335-33WG-7,SGM7SZ14YC5G/TR,LM358AN NOPB,LSP2200CALR,SGM8634,NC7SZ08P5X,INA199B1DCKR,AD8538,TLV3201AIDBVR,SN74AVC2T244DQ,SGM8542,SGM8301,SGM8544,SGM8302,SGM8199A1XC6G/TR,INA199A3DCKR,SGM809-TXN3/TR,SGM8304,SGM8428,AD8668,NCS333SN2T1G,SGM8555-1XN5,SGM8631XN5/TR,SGM8959-1,SGM4556YXDO8G/TR,MC33272,SGM8652,SGM8199A2XC6G,SGM8653,TLV62565DBV,SGM8654,SGM8959-1XN5G/TR,SGM8655,125,SGM8770,NCS20072DR2G,SGM8651,AD8552,SGM8538,LMV824IPT,SN74AHCT245DWR,TLC272,TL064IDT,TLE2021,TLE2142,SGM8199A2,NCS2333DR2G,PT7M7809S,TP5552,SGM41298,SGM6011,LM7321MF/NOPB,SGM8210-2XS8G,SGM8556,SGM8957-2XS8G/TR,SGM2558BYS8G/TR,SGM8552,ISL28133FHZ-T7,OPA340UA,MAX9617AXT+T,SGM8557,SGM8558,IMP811SEUS-T,MCP664,MCP662,SGM6605-5.0YN6G/TR,ADN8834,INA199A2DCKR,NCV33274ADTBR2G,MCP661,SGM3209YS8G/TR,INA199B2DCKR,MC33074ADTBR2G,SGM8199A3XC6G,SN74LVC2244APWR,LM7322MME/NOPB,NL17SZ08DFT2G,MC33078,MCP651,MCP652,AD8628,OPA376AIDBVR,SGM8255-4XS14G/TR,SN74LVC1G125DC,ADA4891-1,LMV342MM NOPB,ADA4891-2,LMV710M5 NOPB,SN74AHC1G14DBVR,AD8510,NCS199A1SQT2G,SN74AVC8T245PWR,AD823,OPA4330AIPWR,74LVC1G08GW,TPH2502,TPH2501,TPH2504,ADA4891-4,LM2903MX,AD8605ARTZ-REEL7,AD8602,SGM8295-4XS14G/TR,AD8605,OPA4277UA,MC33172,SGM7SZ32YC5G/TR,LMC7101QM5/NOPB,SN74LVC1G14DCKR,SGM8210-1,SGM8210-2,TSZ121ILT,AIC809-29,TLV2333IDR,LMV611MF/NOPB,SGM8199A2XC6G/TR,SGM8740YN5G/TR,SGM8632CXMS8G/TR,NC7S04P5X,SGM8271AYN5G/TR,LM3526,OPA2197,SGM8958-1XC5G/TR,AD8665ARJZ-REEL,SGM7SZ244,SGM321,TLV2314IDGKR,SGM8251XS8G/TR,LM258DR2G,TPS61410,SGM8294YTS14G/TR,STR8210-293BSI,SGM80584,SGM8273-2XS8G/TR,AME8500AEETAF26Z,OPA177GS/2K5,LM4871,SGM8252A,SGM809-RXN3/TR,LMV824MX NOPB,SGM7SZ14YN5G/TR,TS507IYLT,SGM8270,LMH6643,SGM8271,LMH6644,SGM8273,LMH6642,MP2459,SGM3749YTN6G/TR,SGM80581,SGM80582,SGM8581XN5G/TR,TS321AILT,LMV822,SGM706B,TLV2372IDGKR,LMV722MMX-NOPB,NJM3403AV,ISL28130CHZ-T7,SN74LVC1G08DBVR,SGM8061,SGM8062,SGM8063,TP2412,SGM4871YS8/TR,OPA2171AIDR,LF353DR,LMV710,TLV333,SGM809-MXN3/TR,LM293ADR,PT7M7809STEX,SGM8965-1XN5G/TR,SGM8051,SGM8052,SGM8295,SGM8053,TPS72733,SGM8054,LMV842,AME8500AEETAF29Z,SGM8055,DRV8837DSGR,SGM708B,SGM8199A1XC6G,SN74AHC1G00DBVR,CY74FCT2245CTQ,SGM8965-1XN5,TS5A3157,MCP6004T-I/SL,SGM2300-ADJYN5G/TR,SGM48751YTS16G/TR,LMC7101AIM5 NOPB,ADA4807-1,LMP2022MAX/NOPB,TLV9062,CY74FCT2244ATQ,LMP7715MFX/NOPB,ADS1115,NCS20081SN2T1G
SGMicro(圣邦微) SGM4568 带自动方向感应的8位双向电压电平转换器数据手册
型号- SGM4568YTQG20G/TR,SGM4568QG,SGM4568YTS20,SGM4568YTS20G/TR,SGM4568
SGMicro(圣邦微)SGM4574系列4位双向电压电平转换器官方数据手册
描述- SGM4574系列4位双向电压电平转换器,SGM4574 4-Bit Bidirectional Voltage-Level Translator for Open-Drain and Push-Pull Applications.
型号- SGM4574,SGM4574YS14,SGM4574YTQM12G/TR,SGM4574YS14G/TR,SGM4574YUQN12G/TR
SGMicro(圣邦微) SGM4564 带自动方向感应的4位双向电压电平转换器数据手册
型号- SGM4564YS14G/TR,SGM4564YS14,SGM4564,SGM4564YTQM12G/TR,SGM4564YUQN12G/TR
SGM4551 Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator Data Sheet
型号- SGM4551,SGM4551YN8G/TR,SGM4551YXDO8G/TR
SGM4556YXET 2-Bit Bidirectional Voltage-Level Translator with Auto Direction Sensing
型号- SGM4556YXET8G/TR,SGM4556YXET
【应用】8位双向电压电平转换器SGM4568助力家用安防网关设计,1.2V至5.5V的输入范围
家用安防网关设计中需要一款高性能的多通道电平转化芯片,连通各个芯片之间的通讯。推荐使用SGMICRO公司推出的具有自动方向感应的8位双向电压电平转换器SGM4568,兼容电平范围宽,A口1.2V至5.5V的输入范围可以兼容市面上大部分通讯IC的电平和主控制器电平;根据两侧输出电平的不同,转换速率从70Mbps至100Mbps不等,可以实现大部分的中低速数据传输功能。
SGMICRO电平转换器选型表
1、2、4、6、8多通道,自动方向感应,可控方向,推挽/开漏输出,DFN小封装
产品型号
|
品类
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Vᴄᴄᴀ Range(V)
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Vᴄᴄʙ Range(V)
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Bidirectional
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Vᴄᴄ Shutdown I/O State
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Logic Output
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Package
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SGM4551
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Level Translators
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1.2 ~ 3.3
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8
|
Bidirectional
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Hi-Z
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Open-Drain
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SOT-23-8 XTDFN-1.4×1-8L
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选型表 - SGMICRO 立即选型
SGM4553 2-Bit Bidirectional Voltage-Level Translator for Open-Drain and Push-Pull Applications
型号- SGM4553YXDO8G/TR,SGM4553YN8G/TR,SGM4553
电子商城
现货市场
服务
可定制单色光灯珠、双色灯珠、全彩灯珠、发光二极管、贴片灯珠、贴片LED等产品,尺寸:0.6*0.3mm-3.2*2.7mm,波长:405-940nm,亮度:24-750mcd,电压:1.5-3.5V。
最小起订量: 3000 提交需求>
整体外形尺寸小至0.6*0.3*0.3mm (DFN0603),工作电压范围覆盖2.5V~36V,电容值低至0.2pF,浪涌能力最高可达240安培,静电等级可达空气放电、接触放电±30KV。提供免费浪涌测试仪、静电测试仪测试。
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