廈門泰尼電氣有限公司
主營(yíng)產(chǎn)品: AB模塊PLC |
廈門泰尼電氣有限公司
主營(yíng)產(chǎn)品: AB模塊PLC |
參考價(jià) | 面議 |
聯(lián)系方式:張亮查看聯(lián)系方式
更新時(shí)間:2018-03-26 22:35:14瀏覽次數(shù):202
聯(lián)系我們時(shí)請(qǐng)說明是泵閥商務(wù)網(wǎng)上看到的信息,謝謝!
AS-B883-200***AS-B883-200
AS-B883-200***AS-B883-200
當(dāng)內(nèi)部輸出是個(gè)低電平,經(jīng)過一個(gè)反相器變成高電平,NPN三極管導(dǎo)通,那么單片機(jī)的內(nèi)部IO口就是個(gè)低電平,這個(gè)時(shí)候,外部雖然也有上拉電阻的存在,但是兩個(gè)電阻是并聯(lián)關(guān)系,不管按鍵是否按下,單片機(jī)的IO口上輸入到單片機(jī)內(nèi)部的狀態(tài)都是低電平,我們就無法正常讀取到按鍵的狀態(tài)了。
這個(gè)和水流其實(shí)很類似的。內(nèi)部和外部,只要有一邊是低電位,那么電流就會(huì)順流而下,由于只有上拉電阻,下邊沒有電阻分壓,直接到GND上了,所以不管另外一邊是高還是低,那電位肯定就是低電位了。公司 名稱:廈門泰尼電氣有限公司
固定 :
聯(lián) 系 人:張亮
傳 真:【請(qǐng)備注“張亮"收】
商 務(wù) : 2314094943
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公司地址:廈門市海滄區(qū)海滄街道濱湖一里7號(hào)2008室
這里得到一個(gè)結(jié)論,這種具有上拉的準(zhǔn)雙向IO口,如果要正常讀取外部信號(hào)的狀態(tài),必須首先得保證自己輸出的電平是‘1’,如果輸出‘0’,則無論外部信號(hào)是高是低,這個(gè)引腳讀進(jìn)來的都是低。
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