3. 數(shù)字化、網(wǎng)絡(luò)化濕度傳感器LTM8901的簡介 a) LTM8901應(yīng)用接線接口 上位機(jī)CPU只需有一個(gè)雙向的I/O引腳，按下面電路連接，即可與LTM8901通訊。 要求MCU的I/O引腳為OC門輸出(或三態(tài)輸出)，同時(shí)具有輸入功能即可。現(xiàn)今大多數(shù)MCU 的I/O腳均有此功能。 b) LTM8901典型特性 工作溫度范圍：-25℃～+85℃ 濕度測(cè)量分辨率：0.5%RH 濕度測(cè)量量程： 1%～99%RH 濕度測(cè)量精度: ±3.0%RH(典型值) 回差： ±2.0%RH(典型值) 年漂移： ±0.5%RH(典型值) 響應(yīng)時(shí)間： 5s(典型值) 工作電壓范圍： 4.5～5.5V 外型尺寸： 70×50×25mm3
三、數(shù)字化、網(wǎng)絡(luò)化傳感器應(yīng)用系統(tǒng)結(jié)構(gòu)簡介
1.數(shù)字化、網(wǎng)絡(luò)化 傳感器 應(yīng)用系統(tǒng)結(jié)構(gòu) 通常應(yīng)用系統(tǒng)由三級(jí)網(wǎng)絡(luò)組成： a)傳感器網(wǎng)絡(luò)，由各種傳感器組成，分布區(qū)域在200～300米范圍內(nèi)。 b)現(xiàn)場(chǎng)總線網(wǎng)絡(luò)，由各種總線采集器組成，如：LTM8000系溫濕度采集模塊，分布區(qū)域在1000～ 2000米范圍內(nèi)。 c) 局域網(wǎng)和廣域網(wǎng)，通常由各種PC及工作站組成，通過INTERNET可實(shí)現(xiàn)遠(yuǎn)程監(jiān)測(cè)和控制。
四、其他數(shù)字化、網(wǎng)絡(luò)化傳感器和相關(guān)產(chǎn)品及應(yīng)用簡介
1. 數(shù)字化、網(wǎng)絡(luò)化計(jì)數(shù)器DS2423 應(yīng)用：多表出戶方案 特點(diǎn)：只需一條3芯線便可將水、電、煤氣等計(jì)量表的數(shù)據(jù)傳遞給單元采集器。 每個(gè)單元為單芯片設(shè)計(jì)，比傳統(tǒng)RS485聯(lián)網(wǎng)方式造價(jià)低、傳統(tǒng)脈沖出戶方式布線簡單。
2. 數(shù)字化、網(wǎng)絡(luò)化煙感報(bào)警器 應(yīng)用：消防監(jiān)控 特點(diǎn)：使用電源線傳輸報(bào)警信號(hào)，多個(gè)傳感器只需兩根線連成網(wǎng)絡(luò)。
3. 信息紐扣DS1991 應(yīng)用：預(yù)付費(fèi)水表、電表等、停車管理系統(tǒng)、門禁系統(tǒng)、巡更系統(tǒng) 特點(diǎn)：采用與數(shù)字化、網(wǎng)絡(luò)化傳感器同樣的網(wǎng)絡(luò)協(xié)議，可方便的與小區(qū)智能系統(tǒng)融為一體。
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