INTERPHASE CORP 4210-004 DUAL CHANNEL SCSI HOST HIGH PERFORMANCE (JAGUAR) VMEBUS比較器檢測電阻電壓L297內(nèi)部斬波器電路示意圖L297單片步進電動機控制器集成電路適用于3硬件體系結(jié)構(gòu)雙性兩相步進電動機或單性四相步進電動機的控制。用L297輸出信號可控制L298雙H橋驅(qū)動集由上述可知，L297內(nèi)部帶有斬波恒流電路，繞送給DAC0832使能信號組相電流峰值由整定，因此，驅(qū)動器硬件電路設(shè)計的基本思想是為L297配備合適的RC網(wǎng)絡(luò)，調(diào)整斬波振蕩脈沖頻率。同時，利用875產(chǎn)生與L297相序的細分電壓的變化階梯，并作為L297的匕引腳輸人，從而控制斬波時刻繞組相電流峰值的個Ref輸人端，因此，在實際的電路設(shè)計中采用，雙L297單L298結(jié)構(gòu)形式。驅(qū)動部分電路如。在采用875產(chǎn)生與L297相序的細分電壓的變化階梯過程中，細分電壓產(chǎn)生電路如，將外部定頻率的脈沖信號經(jīng)過篼速光藕6N37光電隔離后，分別送到875的外部中斷和計數(shù)器0，其中計數(shù)器0工作在方式2，即自動重裝初值的8位計數(shù)器。由于計數(shù)器0中斷就比外部中斷篼個別，所以不用設(shè)置中斷優(yōu)，每當(dāng)外部脈沖信號輸人時，計數(shù)器加，當(dāng)計數(shù)寄存器溢出時，觸發(fā)計數(shù)器0中斷，在中斷響應(yīng)函數(shù)中，讓單片機的P0口輸出相應(yīng)的脈沖信號，經(jīng)反向后送給L297的CLOCK引腳。在隨后觸發(fā)的外部中斷中，讓計數(shù)變量自加，同時輸出以該計數(shù)變量作為下標的數(shù)組值到P0口，然后經(jīng)過DAC0832的8位數(shù)模轉(zhuǎn)換，將產(chǎn)生的階梯電壓送給L297的引腳。這樣，不僅實現(xiàn)了與L297時序的細分雙L297單L298結(jié)構(gòu)驅(qū)動部分硬件電路圖步進電機細分電壓產(chǎn)生電路39嘗￥壓的數(shù)組值，可以實現(xiàn)高細分數(shù)的可變細節(jié)。
為了實現(xiàn)步進電機的細分驅(qū)動，需要在適當(dāng)時刻取出相應(yīng)細分代碼，同時要求在每次電機相序變化時剛完成次細分周期輸出。EPROM固化程序流程圖如。
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