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[原创] TI ISO7041超低功耗四路数字隔离器解决方案

关键词:工业控制 工厂自动化 过程控制 GPIO UART ISO7041

时间:2019-09-19 11:15:36       来源:中电网

TI公司的ISO7041是超低功耗四路数字隔离器,用来隔离CMOS或LVCMOS数字I/O.每个隔离通路有逻辑输入和输出缓冲器,它们由双层容性二氧化硅(SiO2)绝缘层所分开.基于创新的一流架构和ON-OFF键控调制方案的组合,使得隔离器消耗非常低的功耗而满足3000-VRMS隔热指标perUL1577.每路动态电流消耗小于120 μA/Mbps,每路静态电流消耗在3.3V时小于3.5μA,使得ISO7041在功耗和热严格要求的系统设计中都能用到.器件工作电压低到2.25V,高达5.5V,四路隔离器采用16-QSOP封装.信令速率高达2Mbps,大于100年预期寿命,绝缘指标3000 VRMS,典型的CMTI为±100 kV/μs,安全标准为UL 1577,DIN V VDE V 0884-11,CQC, TUV 和CSA证书和IECEx (IEC 60079-0 & IEC 60079-11) 以及ATEX (EN 60079-11).主要用在4mA-20mA回路供电发送器,工厂自动化与过程控制以及其低功耗GPIO,UART和SPI隔离.本文介绍了ISO7041主要特性,功能框图和应用电路,以及评估模块ISO7041DBQ EVM配置图,工作图,电路图,材料清单和PCB布局图.

The ISO7041 device is an ultra-low power,multichannel digital isolator that can be used to isolate CMOS or LVCMOS digital I/Os. Each isolationchannel has a logic input and output buffer separatedby a double capacitive silicon dioxide (SiO2)insulation barrier. Innovative edge based architecturecombined with an ON-OFF keying modulationscheme allows these isolators to consume very-lowpower while meeting 3000-VRMS isolation rating perUL1577. The per channel dynamic currentconsumption of the device is under 120 μA/Mbps andthe per channel static current consumption is 3.5 μAat 3.3 V, allowing for use of the ISO7041 in bothpower and thermal constrained system designs.

The device can operate as low as 2.25 V, as high as5.5 V , and is fully functional with different supplyvoltages on each side of isolation barrier. The fourchannel isolator comes in a 16-QSOP package withthree forward-direction channels and one reversedirection channel. The device has default output highand low options. If the input power or signal is lost,default output is high for the ISO7041 device withoutthe suffix F and low for the ISO7041F device with theF suffix.

ISO7041主要特性:

• Ultra-low power consumption
– 3.5 μA per channel quiescent current (3.3 V)
– 15 μA per channel at 100 kbps (3.3 V)
– 116 μA per channel at 1 Mbps (3.3 V)
• Robust isolation barrier
– >100-year projected lifetime
– 3000 VRMS isolation rating
– ±100 kV/μs typical CMTI
• Wide supply range: 2.25 V to 5.5 V
• Wide temperature range:
– 2.25 V to 3.6 V: –55℃ to +125℃
– 3.6 V to 5.5 V: –40℃ to +125℃
• Small 16-QSOP package (16-DBQ)
• Signaling rate: Up to 2 Mbps
• Default output High (ISO7041) and Low(ISO7041F) options
• Robust electromagnetic compatibility (EMC)
– System-level ESD, EFT, and surge immunity
– ±8 kV IEC 61000-4-2 contact dischargeprotection across isolation barrier
– Very low emissions
• Safety-related certifications (planned):
– UL 1577 Component Recognition Program
– DIN V VDE V 0884-11
– CQC, TUV and CSA certifications
– IECEx (IEC 60079-0 & IEC 60079-11) andATEX (EN 60079-11)

ISO7041应用:

• 4-mA to 20-mA loop powered field transmitters
• Factory automation, process automation
• Low-power GPIO, UART and SPI isolation

图1.ISO7041功能框图

图2. ISO7041用于温度现场发送器的隔离SPI电路图

图3.典型 ISO7041电路连接图

ISO7041低功耗隔离数字绝缘器评估模块EVM

This user’s guide describes the ISO7041 Low-Power Isolator Digital Isolator Evaluation Module (EVM).

This EVM allows designers to evaluate device performance for fast development and analysis of isolatedsystems. The EVM supports evaluation of any of the quad-channel Low-Power digital isolators in a 16-pinSSOP (DBQ) package.

图4.评估模块ISO7041DBQ EVM配置图

图5.评估模块ISO7041DBQ EVM外形图

图6.评估模块ISO7041DBQ EVM基本工作图

图7.评估模块ISO7041DBQ EVM电路图
评估模块ISO7041DBQ EVM材料清单:


图8.评估模块ISO7041DBQ EVM PCB布局图
详情请见:
http://www.ti.com/lit/ds/symlink/iso7041.pdf
http://www.ti.com/lit/ug/slau797a/slau797a.pdf
slau797a.pdf
iso7041.pdf

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