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IC693MDL740

IC693MDL740

IC693MDL740

IC693MDL740

本轉(zhuǎn)換器只需要一片單發(fā)/單收RS-232接口就可以滿足要求但必須要求+3V單電源工作工作電流盡可能地小的接口電路MAX3221/MAX3221E 帶15kVESD保護(hù)剛好能夠滿足上述要求具有1TX/1RX 其工作電壓+3V至+5.5V, 僅1 A的靜態(tài)電流負(fù)載電流小于I2=2mA
4.3. RS-485/RS-422接口
為兼顧RS-485/RS-422 接口中半雙工和全雙工的要求本轉(zhuǎn)換器采用MAX3491 作為RS-485/RS-422 接口電路其主要指標(biāo)為+3V 至+3.6V 單電源工作工作電流1mA,驅(qū)動60負(fù)載時(shí)半雙工時(shí)兩個(gè)120 終端匹配電阻的并聯(lián)值峰值電流可達(dá)I3=3V/60 =50mA半雙工和全雙工工作方式是通過跳線器來設(shè)置的見圖3
4.4. 微處理器
在本轉(zhuǎn)換器中微處理器所要完成的任務(wù)很簡單僅需要幾根I/O 線即可實(shí)現(xiàn)參數(shù)的設(shè)置和發(fā)送使能的自動控制實(shí)際選擇中采用Microchip公司的PIC12C508A其主要指標(biāo)為工作電流I4<1.0mA(工作電壓3V 頻率4MHz),6 條I/O 線512kByte 的ROM 其中GP0 GP1 GP4和GP5四個(gè)引腳設(shè)定對應(yīng)于16 種常用波特率300 600 1200至38.4Kbps等8 種以及900 1800 至115.4Kbps等8種的延時(shí)時(shí)間GP3對應(yīng)于10位或11位串行數(shù)據(jù)格式GP2為TXD輸入用來檢測UART何時(shí)發(fā)送和停止數(shù)據(jù)GP1為復(fù)用輸出引腳用來控制MAX3491的發(fā)送使能控制端GP0也為復(fù)用輸出引腳用來控制MAX3491的接收使能詳見圖3

此主題相關(guān)圖片如下：


本轉(zhuǎn)換器的最大電流總和
5. 軟件設(shè)計(jì)
本轉(zhuǎn)換器的軟件設(shè)計(jì)較為簡單微處理器復(fù)位后將所有的I/O 口設(shè)為輸入并讀入所有的I/O 狀態(tài)保存到寄存器將GP2 和GP3 改設(shè)為輸出狀態(tài)并輸出低電平使RS-485/RS-422 接口處于禁止發(fā)送允許接收的狀態(tài)CPU 根據(jù)GPIO 的初始狀態(tài)確定出用戶設(shè)定的通訊波特率和串行數(shù)據(jù)格式從而預(yù)置內(nèi)部的延時(shí)設(shè)定CPU 檢測到UART開始通訊后打開發(fā)送使能經(jīng)內(nèi)部預(yù)置延時(shí)后開始在一個(gè)位寬時(shí)間內(nèi)檢測是否有下一個(gè)起始位到來如檢測到則重新延時(shí)等待否則關(guān)閉發(fā)送使能結(jié)束當(dāng)前通訊重新檢測UART的起始位對于半雙工通訊方式允許發(fā)送使能前應(yīng)該關(guān)閉接收使能而在發(fā)送使能關(guān)閉后才打開接收使能對于全雙工通訊方式其接收使能可以不受此信號控制而可以直接通過跳線接地始終允許接收

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