跟读练习: How To Read A Datasheet - Electronics with Becky Stern | DigiKey - 通过视频学习英语口语
正在创建课程...
1
Hi, I'm Becky Stern, and today we're demystifying data sheets.
2
Keep watching to understand how to read one and how they can help you choose the right components, as well as the best ways to use that part in your project.
3
Let's get started.
4
A data sheet serves as a user manual for a particular electronics component.
5
When you first look at one, you might be overwhelmed.
6
I know I was.
7
There's so much technical info because engineers are the target audience, not beginners.
8
But densely packed as they are, every electronics component has a data sheet full of useful info.
9
And I hope by the end of this video, they'll be your new best friend.
10
Data sheets serve up the important facts about a specific component, such as its electrical characteristics, pin configuration, and physical dimensions.
11
Often, you'll also get graphs showing the part's performance under different conditions, and more advanced integrated circuits will include timing diagrams,
12
truth tables, or instructions for programming, depending on what's relevant.
13
You don't need to understand every section of the datasheet to find the information you want.
14
Datasheets reminded me of word searches, where I had to siphon through the gibberish to find the right info.
15
For example, I want to use this LED in my project.
16
I know it needs a resistor, but I don't know what value resistor to use.
17
So I look to the data sheet to find the info I need, the forward voltage and the forward current of the LED.
18
Then I plug those values into Ohm's law to calculate its appropriate resistor for my circuit.
19
I don't need to know, for example, the chemical makeup of the LED.
20
I can skim over and and go to the section that contains the information I need.
21
When I was just starting out, this particular concept was a bit of a challenge for me.
22
I have since learned that this is a common sentiment for beginners, so that's why I'm mentioning it so early in this video.
23
First up, you need to know where to find a parts data sheet.
24
Usually, the place you bought it will have a link to the data sheet right on the product's webpage.
25
Otherwise, if you don't know where the part came from, you can search the name or the number of the part plus the word data sheet.
26
When I'm doing teardowns, sometimes all I have to go by are the markings on the IC, which are not always the same as the part number, but can often help with the data sheet search.
27
Once you open the data sheet, notice that the first page contains high level info about the component, a list of its essential features, and its voltage and power specs.
28
This is usually where you'll find what you're looking for when you're shopping or otherwise picking out parts for your project.
29
You may notice that your data sheet references a series of components rather than just one.
30
Often data sheets will group similar parts, sometimes because a particular component is available in a different package size,
31
or sometimes it's because it's a part of a series with a lot of similarities.
32
So next, you'll need to identify which variant is yours so you can narrow down its particular info.
33
One of the most important sections you'll run into is called the absolute maximum ratings.
34
is basically the do not exceed list for your component.
35
These are the limits the manufacturer says the part can withstand without immediate damage, like the highest voltage or temperature it can handle.
36
But these are not the recommended values for normal use.
37
They're the danger zone.
38
So you can't design a circuit to operate at these max values and expect your component to hold up long term.
39
These are the values that can risk letting out the magic blue smoke.
40
So treat this section as a warning label.
41
Right next to, or sometimes right below, the absolute maximum ratings, you'll find the recommended operating conditions.
42
These are the sweet spots where your component is designed to perform reliably.
43
This section usually includes things like the supply voltage range, the input signal levels, and the operating temperature.
44
When you're designing a circuit, these are the numbers you want to stick to to get your component to behave reliably and how you expect.
45
Another key section is called the pin configuration, sometimes called the pinout diagram.
46
This is where you will find a labeled map of what each pin on your component does.
47
It's essential for wiring up things correctly.
48
For simple components like an LED, it's pretty straightforward, but for ICs with dozens of pins, the diagram helps you decode which ones are for power,
49
ground, inputs, outputs, communication lines, and more.
50
You'll often see both a visual layout and a table listing each pin with its name, number, and function.
51
When I'm breadboarding or laying out a PCB, this is the page I'm constantly referencing.
52
Data sheets are particularly useful for designing a printed circuit board, or PCB.
53
We covered PCB basics in a previous episode of this series, so go check that out if you're new to this.
54
The data sheet will contain drawings of the component with physical dimensions, like the size and the spacing of the pins,
55
so you can create accurately matching pads and mounting holes in your circuit design.
56
Realistically, the software you will use probably has most of the common parts and packages available for you, so you don't need to recreate the footprints by hand most likely,
57
but it's always a good idea to double check that the software version matches the measurements in the data sheet.
58
Learning to read and navigate data sheets will make you a lot more confident when selecting parts for your next project, and they can provide answers when troubleshooting too.
59
I also believe it marks a pretty big jump from beginner level electronic skills to intermediate.
60
With that said, let's go through a few real world examples.
61
Here's a data sheet for a 5 mm red LED.
62
Say I want to use this in a simple circuit with a battery and a resistor.
63
I start by looking at the forward voltage, listed here as typically 2.1 volts, with a maximum of 2.6 volts at 20 milliamps.
64
That's the voltage drop I'll use in my Ohm's Law calculation to size the current limiting resistor.
65
The recommended forward current is 20 milliamps, which will provide optimal brightness without pushing the LED too hard.
66
The absolute maximum forward current is 30 milliamps, and the peak is even higher at 100 milliamps in PULSE mode.
67
But again, we don't want to run that close to the edge.
68
We can see that this LED's viewing angle is 35 degrees, which is fairly directional.
69
I also love checking the graphs.
70
This one shows how the current increases deeply with voltage and how brightness scales with current.
71
All this helps me design a circuit that's safe, efficient, and performs the way I expect.
72
So if I do the math, with this LED's forward voltage and a 4.5 volt battery pack,
73
I need to subtract the forward voltage from the supply voltage to get V in my Ohm's law equation,
74
divide that by the LED's recommended forward current to get the size of the ideal resistor in Ohms.
75
Since we know there's some wiggle room around the recommended current range, it's okay to round to the next nearest common resistor value.
76
So if you've got a 100 ohm or a 220 ohm resistor, those would both work fine.
77
Now let's look at an example using this PIR motion sensor, which is super beginner friendly.
78
It acts like a digital switch that flips high when motion is detected and low when it's idle.
79
The data sheet tells us the output is 3 volts when triggered, and it works with a supply voltage of 5 to 12 volts.
80
This is the perfect match for most microcontrollers' logic, which is usually either 3 or 5 volts.
81
Reading the data sheet lets us know that after we hook it up to power, ground, and signal pins on our Arduino or other microcontroller and power it on,
82
we should wait 30 to 60 seconds for the sensor to stabilize before the reading will be reliable.
83
When motion is detected, the output goes high, and we can read that from any digital I.O pin.
84
The datasheet also covers things like re-triggering, which is where the signal stays high as long as there's motion or doesn't, depending on the position of this jumper.
85
And it tells us that the two small potentiometers on the board, also called TrinPots, control the timeout duration and the sensitivity.
86
From the datasheet, we also learn how important the domed plastic lens is to increasing the range of the sensor.
87
We're also shown an example circuit, an Arduino code example to get up and running.
88
The code examples are above and beyond for a data sheet on this one.
89
Okay, let's look at one more example.
90
This is the data sheet for one of my favorite microcontrollers to use, the Arduino Nano ESP32.
91
The datasheet says that the VIN, or voltage input, can accept 6 to 21 volts, so I could power the board from a variety of different battery packs or wall adapters.
92
The datasheet also lists the current limits, so I know the GPIO pins can only deliver up to 28 milliamps of current each.
93
This would explain by wiring up one LED works fine, but adding more results in problems.
94
The pinout section tells me which pins to use when hooking up I2C or SPI devices.
95
Admittedly, I will reference microcontrollers pinout diagrams more frequently than their full data sheets, but when you're working with a powerful board like this one,
96
the data sheet is more than just specs.
97
It's your roadmap to all the device's capabilities.
98
Now onto a few more advanced sections that might be included in a parts data sheet, depending on what it is.
99
If your data sheet includes a truth table, you're likely dealing with a digital logic component like a multiplexer or a logic gate.
100
A truth table shows you how the outputs respond to different combinations of inputs, showing you the cause and effect.
101
Each row represents a different input condition and the corresponding output tells you what the chip will do in that situation.
102
It's super helpful for wrapping your head around how a part behaves before you even hook it up.
103
Thanks, data sheet!
104
Timing diagrams show how voltage levels change over time for different pins on digital components
105
that rely on clock signals or communication protocols.
106
For example, a timing diagram might show when data is read or written, or how long a reset pulse needs to be.
107
If you're using a component with a precise sequence of events, like a shift register or memory chip, this diagram is your roadmap.
108
It can look intimidating at first, but once you learn to read the lines like a musical score, it starts to make sense.
109
I find them especially helpful when debugging.
110
I can compare what I see on my oscilloscope or logic analyzer to what the timing diagram says should be happening.
111
Data sheets often include plots and graphs to show how a component behaves under different conditions, like temperature, voltage, or frequency.
112
These can look a little abstract at first, but they're incredibly helpful for understanding performance trends.
113
For example, an LED might have a graph showing how its forward voltage drops slightly as temperature increases,
114
or a transistor's gain may vary with collector current.
115
These visualizations help you predict what your part will do in the real world.
116
Plots and graphs help you design smarter and avoid surprises later.
117
And there you have it, a beginner's guide to data sheets.
118
Knowledge is power.
119
I hope this video gives you the confidence to use them effectively.
120
I've put links to some more resources in the description.
121
Leave your advice and questions in the comments so we can all learn together.
122
Check out the playlist with the rest of the series and subscribe to be sure you don't miss the next one.
📺 同频道
✨ 推荐视频
B22
159 句
Electrical Engineering Simply Explained
Business EnglishUniversity StudentsWorking Adults
B2172 句
How to Create Your Own HABIT TRACKER | Step-by-Step Tutorial for Beginners | Google Sheets
Business EnglishUniversity StudentsWorking Adults
B21
220 句
How Modern Data Teams Work (Engineer, Analyst, Scientist, Architect, ML)
Business EnglishUniversity StudentsWorking Adults
B22
252 句
Memory is crazy expensive so I made my own…
Business EnglishUniversity StudentsWorking Adults
B21
42 句
Jordan Peterson - How To Read And Study More Effectively
Business EnglishUniversity StudentsWorking Adults
C124 句
Sofeast PCB Video Series Introduction
Business EnglishUniversity StudentsWorking Adults
C11
19 句
Types of Proximity Sensors! #automation #engineering #science #robotics #electronics
Business EnglishUniversity StudentsWorking Adults
C1117 句
Anatomy & Physiology: The Ultimate Beginner's Guide | Dr. Bee's Tutorials
Business EnglishUniversity StudentsWorking Adults
C151
8 句
Digital Twins Explained: A Quick Guide for Manufacturers and Engineers
Business EnglishUniversity StudentsWorking Adults
B21
327 句
I Studied Nutrition for 30 Years. Here’s What Actually Matters.
Business EnglishUniversity StudentsWorking Adults
C11
114 句
BAS Bootcamp: Day 6 Setting up IO Internally
Business EnglishUniversity StudentsWorking Adults
B12
57 句
Basic Engineering tools
Business EnglishUniversity StudentsWorking Adults
本课的词汇与口语要点
这节 B2 级别的口语课以视频“How To Read A Datasheet - Electronics with Becky Stern”为素材。 视频中反复出现的词有：sheet, component, voltage, pin, current。 这段视频共有 122 个句子、2026 个单词可供跟读。 讲话部分时长为 11:14。 说话人语速较快，每分钟约 180 个词，会出现较多连读和弱读。 只有 77% 的单词属于英语最常用的 3,000 词，词汇难度较高。
视频中的重点词汇
视频中最难的 15 个单词，附发音和释义：
| 单词 | 发音 | 释义 |
|---|---|---|
| voltage 名词 | /ˈvəʊltɪd͡ʒ/ | 電壓 /电压 |
| resistor 名词 | /ɹɪˈzɪstɚ/ | 反抗者 |
| diagram 名词 | /ˈdaɪ.ə.ɡɹæm/ | 圖 /图, 圖表 /图表 |
| volt 名词 | /vəʊlt/ | 伏特, 伏 |
| graph 名词 | /ɡɹæf/ | 圖表 /图表 |
| microcontroller 名词 | /ˈmaɪkɹoʊkənˌtɹoʊlɚ/ | 單片機 /单片机 |
| beginner 名词 | /bəˈɡɪnɚ/ | 初學者 /初学者, 新手 |
| sensor 名词 | /ˈsɛn.sɚ/ | 傳感器 /传感器 |
| behave 动词 | /bɪˈheɪv/ | 為人 /为人 |
| depend 动词 | /dɪˈpɛnd/ | 信任, 信賴 /信赖 |
| reliably 副词 | 可靠地 | |
| spectacles 名词 | /ˈspɛktəkl̩z/ | 眼鏡 /眼镜, 眼鏡兒 /眼镜儿 |
| brightness 名词 | /ˈbɹaɪtnəs/ | 明亮 |
| configuration 名词 | /kənˌfɪɡ.əˈɹeɪ̯.ʃən/ | 編排 /编排, 配置 |
| dimension 名词 | /daɪˈmɛn.ʃən/ | 方面, 特點 /特点 |
视频中出现的短语动词
| 单词 | 释义 |
|---|---|
| check out 动词 | 退房 |
| get up 动词 | 起床 |
| go through 动词 | 通過 /通过 |
视频中的语法
说话人最常用的结构，并附上视频中的原话：
| 结构 | 视频中的用法 |
|---|---|
| 被动语态 be + 过去分词 — 强调发生了什么，而不是谁做的 | might be overwhelmed · is called · is designed |
| 定语从句 who / which + 从句 — 补充说明人或事物 | milliamps, which will · degrees, which is · sensor, which is |
需要注意的发音
说话人用了 35 次缩略和弱读形式，例如 don't, you're, you'll。请按听到的简短形式来说。
- “th” 音: withstand /wɪðˈstænd/, mathematics /mæθ(.ə)ˈmæt.ɪks/
- “sh” 和 “zh” 音: configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/, dimension /daɪˈmɛn.ʃən/, directional /dɪˈɹɛk.ʃə.nəl/, gibberish /ˈd͡ʒɪ.bə.ɹɪʃ/, potentiometer /pəˌtɛn(t)ʃiˈɑmɪtəɹ/
- 长单词——注意重音位置: microcontroller /ˈmaɪkɹoʊkənˌtɹoʊlɚ/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/, electronics /ɪˌlɛkˈtɹɑ.nɪks/, analyzer /ˈæn.əˌlaɪ.zɚ/, demystify /diːˈmɪstɪfaɪ/
如何用这段视频练习
- 先完整听一遍视频，不要开口，记下不认识的单词。
- 先用 0.75 倍速逐句跟读，熟练之后再回到正常速度。
- 录下自己的声音并与原声对比，特别注意 voltage, resistor, diagram 这类单词。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。