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pull high resistor 在 [問題] pull-up resistor - 看板Electronics - 批踢踢實業坊 的推薦與評價


作者Kxkg ()
看板Electronics
標題[問題] pull-up resistor
時間Sat Feb 23 00:42:53 2019

各位大大好
小弟有個簡單的問題，但是真的鬼打牆百思不得其解
就是Open drain circuit裡為什麼一定要放pull-up resistor？
示意圖如下：
Vcc
/|\
|
---
| |
|R| PULL-UP RESISTOR
| |
---
|
|
----------- OUTPUT
|
|
-------- |
| | |----|
| | ||
| IC |-----||<---|
| | || |
| | |----|
-------- NMOS |
|
---
- GND

當然已經爬過許多文章跟影片，我知道IC可以藉由讓NMOS導通的方式讓Output為LOW
而當NMOS cut off的時候因為有pull-up resistor所以可以將Output拉到HIGH

Pull-up resistor的必要性在於如果沒有它，此時Output會是floating狀態
因為受到雜訊干擾無法定義他的值(希望我的理解沒錯，如果有錯麻煩也告知)

但是！ 小弟的問題就是卡在無法理解他的答案
即使沒有pull-up resistor的存在，若NMOS不導通時Output不就是直接接到Vcc，
所以Output電位等於Vcc而應該輸出為HIGH嗎? 為什麼會是floating呢？

而如果此時Output是floating的狀態，為什麼在Output跟Vcc之間加入一個電阻
就可以讓Output電壓穩定在Vcc輸出為HIGH? 他們的差異是什麼？ 有電流經過嗎？

希望有高手能幫忙解惑，真的被卡了很久想不出來...





--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 114.24.82.59
※ 文章網址: https://www.ptt.cc/bbs/Electronics/M.1550853776.A.956.html
推 goldcow513: 不加電阻輸出不就永遠是vdd嗎... 02/23 01:08
→ peng978: 你搞錯了 不導通不會接到VCC 02/23 01:24
Output沒有經過Rpu直接連到Vcc的情況，NMOS不導通，為什麼不會接到Vcc呢？
推 guguchick: 1. 你拿掉Rpu, 這樣output還會有low的機會嗎？有啦，可 02/23 01:33
→ guguchick: 能把VCC抽到沒電為止… 02/23 01:33
→ guguchick: 2. 拿掉Rpu不接VCC，output下一級接MOS gate, 你open d 02/23 01:37
→ guguchick: rain導通到0然後關閉，此時沒有辦法pull up，你覺得out 02/23 01:37
→ guguchick: put是什麼值？ 02/23 01:37
推 guguchick: 3. NMOS cut off狀態，沒有沒有電流，VDrop=0＊Rpu，Vo 02/23 01:45
→ guguchick: ut=VCC-VDrop 02/23 01:45
→ guguchick: 多打了一個沒有 02/23 01:46
推 guguchick: 你可以想想Pseudo NMOS inveter的原理 02/23 01:55
1.是我原本想過可能的理由，但都沒有查到所以我以為不是這個原因 2.我是指拿掉Rpu但
還接著Vcc的狀況，這樣不就是1嗎？3.照這個公式Rpu=0，VDrop一樣等於0，Vout=Vcc，
Rpu不就沒有必要存在？
→ dsplab: 若無提升電阻，當NMOS導通時，電源會短路 02/23 08:02
大家的回答似乎都是偏向沒有Rpu的時候若NMOS導通，電路會短路而電流過大且無法確定
Out值，所以答案應該就是這樣？
推 yooo4017: 分壓的概念 這樣才能達到產生邏輯0/1的效果 02/23 08:46
※ 編輯: Kxkg (118.161.218.178), 02/23/2019 17:46:58
※ 編輯: Kxkg (118.161.218.178), 02/23/2019 17:48:14
推 blacktea5: 個人認為電阻是限流 02/23 19:41
推 blacktea5: 這個電路是邏輯需要的driving 不用很大 需要限流電阻 02/23 19:44
→ blacktea5: *不需要 02/23 19:45
→ samm3320: 這種pin只有nmos pull low，你不接電阻到vdd就沒有pull 02/23 22:02
→ samm3320: high的路徑 02/23 22:02
→ samm3320: 你的困擾應該是誤以為電阻拔掉是短路，但應該是斷路。短 02/23 22:06
→ samm3320: 路的話等效上還是接一個小電阻到vdd，這樣nmos不夠強會 02/23 22:06
→ samm3320: 拉不下來 02/23 22:06
這個可能就是我卡到的點！ 我以為不放電阻直接拉一條線到Vdd那電位就會相等，但等效
上這樣還是有一個小電阻。網路上說不放Rpu那Output會是floating，應該是指說
不放Rpu = 斷路 = floating，這樣就說得通了！ 謝謝大大指教
※ 編輯: Kxkg (118.161.218.178), 02/24/2019 00:05:28
→ peng978: 回你回應我的 直接連Vcc當mos開時vcc跟地就會短路 02/24 02:32
→ peng978: 如果mos不開 那會是Vcc 但這完全沒用處啊 02/24 02:33






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pull high resistor 在 The role of pull-up resistor to allow inverted logic high/low ... 的推薦與評價

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各位大大好小弟有個簡單的問題，但是真的鬼打牆百思不得其解就是Open drain circuit裡為什麼一定要放pull-up resistor？ 示意圖如下： Vcc.

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In engineering, there are many words that does not make much sense if you just literally translate it (like dictionary). The term 'Pull-up Resistor' is one of ...

#88. PULL UP RESISTOR AND PULL DOWN RESISTOR - PIJA ...

Pull up resistors are used in digital logic circuits to make sure logic level or logic state at a pin is HIGH. Digital logic circuits consist of three ...

#89. What is a pull-up resistor? (newbie) - Electro Tech Online

"Pull-up" means simply that the resistor is connected to the ... The 2.2k resistor and the AVR chip will then form a voltage divider, ...

#90. Picking Pull-Up Resistor Values | #25 - AddOhms

A common question that comes up about pull-up resistors: what value do you pick and why not just use a piece of wire? In this follow-up ...

#91. Solved What is a pull-up or pull-down resistor and what are

Pull up resistors are generally used more often than pull down resistors. This problem has been solved! See the answer ...

#92. How Pull-Up and Pull-Down Resistors Work in Logic Circuits

In this post we are going to explore pull-Up resistor and pull-down resistor, why they are commonly used in electronic circuits, ...

#93. pull-up resistor - 知乎专栏

pull -up resistor · 1. Difference Between Resistance and Impedance · 2. Tri-state Logic · 3. Parasitic capacitance · 4. Pull-up Resistor · 5. CMOS and ...

#94. Push pull, open drain circuit, pull up, pull down resistor - 博客园

Push pull 就以下面這個電路來說， + 因為沒有pull up resistor， 所以output voltage 由low 往high 的速度會較快。 + 有兩個電晶體，一個on.

#95. What is a Pull-up / pull-down resistor / e-radionica.com ...

Pull -up and pull-down resistors are not a special type of resistor but simply a constant value connected via, mainly, + 5V and pin or GND and ...

#96. 上拉（Pull Up ）或下拉（Pull Down）電阻詳解 - 台部落

上拉（Pull Up ）或下拉（Pull Down）電阻（兩者統稱爲“拉電阻”）最基本的作用是：將狀態不確定的信號線通過一個電阻將其箝位至高電平（上拉）或低電 ...

#97. NPN Transistor and Pull-Up Resistor - EE Web

You need to put a Pull-Up Resistor from your supply to the open collector of the transistor, as shown below (resistor R). It's called a pull-up ...