隔離工業(yè)接口時(shí)，需要區(qū)分過程控制和工廠自動(dòng)化應(yīng)用。這是因?yàn)閮烧咧�間的差別會(huì)影響
到數(shù)字接口設(shè)計(jì)的隔離工作。過程控制一般涉及到檢測(cè)某些設(shè)備、系統(tǒng)或過程的不同物理量
(如壓力“與”溫度)。每一個(gè)物理量都用--特定類型的傳感器或變換器，其輸出信號(hào)需要特定
的信號(hào)調(diào)理。因此，多種不同的傳感器需要不同的參數(shù)設(shè)置，如內(nèi)部增益、采樣率、測(cè)量重復(fù)
性、以及阻抗緩沖。支持寬范圍設(shè)置的ADC提供有多個(gè)接口控制線，除標(biāo)準(zhǔn)串行接口線要求
隔離之外，所有這些控制線也都要求隔離。
圖4中，許多不同靈敏度(mV/K)的傳感器測(cè)量不同的過程參數(shù)，如溫度、壓力和電流。要
求有多種增益設(shè)置來使各傳感器的ADC的輸入動(dòng)態(tài)范圍最大化。如果期望-一個(gè)或多個(gè)通道輸
入變化能比別的通道快，可能就要求采樣率(速度)之間有切換。降低功率功能用來節(jié)省測(cè)量
后的功耗，此功能可使控制器執(zhí)行其它系統(tǒng)功能。這種高度多功能性要求許多控制通道用兩個(gè)
四路隔離器隔離。
與過程控制相比，工廠自動(dòng)化常涉及監(jiān)測(cè)多個(gè)器件和設(shè)備的單個(gè)物理量(如溫度‘或壓
力)。因此，這些系統(tǒng)采用多個(gè)同類型傳感器，靈敏度和響應(yīng)時(shí)間一致。
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