Understanding I2C

Подписаться 66 тыс.

Просмотров 67 тыс.

50% 1

This video provides a brief technical overview of the I2C protocol and how it is used to transfer digital information.
Learn more about Rohde & Schwarz Oscilloscopes: rsna.us/6058gzlvA
Timeline:
00:00 Introduction
00:14 About I2C
01:00 Basic I2C topology
01:36 Overview of I2C frames
02:10 Start condition
02:51 Slave address
03:36 Aside: timing relationship between SDA and SCL
04:16 Read / write bit
04:51 Ack(knowledge) bit
05:32 Data byte(s)
06:06 Multiple data bytes
06:48 Stop condition
07:28 About “open drain”
08:14 Pull up resistor values
08:56 Modes / speeds
09:54 Summary

Наука

Опубликовано:

3 июл 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 69

@miguelcaldeirinha5316 2 месяца назад

I am currently doing my master in eletronic Engineering and by far this is the best explanation i have found in the internet, very complete and easy to understand. Congrats

@pauldenisowski Месяц назад

Thank you!

@evertonf.dossantos4511 6 месяцев назад

Thank you! This is the best explanation I've found in YT.

@pauldenisowski 5 месяцев назад

Thank you - more to come!

@andychess 5 месяцев назад

Super video. Just the right length and depth of content. Thank you!

@pauldenisowski 5 месяцев назад

Thank you!

@Annie_EE Год назад

This video saved me so much time - just the information I needed. Please make more!!!

@pauldenisowski Год назад

Thank you! There are already videos on UART and SPI, and some videos on automotive protocols are currently under development as well.

@salarbasiri5959 9 месяцев назад

This is by far the best explaination

@pauldenisowski 9 месяцев назад

Thank you!

@wormdamage Месяц назад

That has got to be one of the best of these types of videos I've ever seen!

@pauldenisowski 28 дней назад

Thank you! I also have videos on UART, SPI, and SPMI :)

@shizudaren Месяц назад

As a Communication and networking student, I can confirm that this is exactly what I learn in my 1 hour lecture

@pauldenisowski 28 дней назад

Thanks!

@hklausen 11 месяцев назад

Good presentation. It's all very clear.

@pauldenisowski 11 месяцев назад

Thanks for the feedback!

@sawekky2392 Месяц назад

I love this explanation. Thank you!

@pauldenisowski Месяц назад

Thanks!

@pascalphase2556 Месяц назад

Very instructive vidéo ! Thank you from France...

@pauldenisowski 28 дней назад

Merci!

@user-ds4mk7nb8q 2 месяца назад

Great explanation. Thanks!

@pauldenisowski Месяц назад

Thanks!

@mevez3185 2 месяца назад

Excellent work. Thanks for your video

@pauldenisowski Месяц назад

Thanks!

@souzasilvestre 6 месяцев назад

best explanation in the web

@pauldenisowski 5 месяцев назад

Thanks!

@VIKAS-2003 4 месяца назад

Best explanation... Thanks!!

@pauldenisowski 4 месяца назад

Thanks you!

@mums2109 3 месяца назад

Fantastic video!

@pauldenisowski 3 месяца назад

Thank you!

@kvedavyas2010 6 месяцев назад

Very good explanation.

@pauldenisowski 5 месяцев назад

Thanks for watching!

@technical5880 Месяц назад

thank you, for the great job.

@DanielGakpetor Месяц назад

thanks, this was so clutch

@pauldenisowski Месяц назад

Thank you!

@ZirJo 5 месяцев назад

Excellent! Thank you

@pauldenisowski 5 месяцев назад

Thanks for watching!

@rodeliohernandez1647 4 месяца назад

Thank you .

@kufirre 6 месяцев назад

Very good video

@pauldenisowski 5 месяцев назад

Appreciate it!

@7073shea 6 месяцев назад

Thank you!

@pauldenisowski 5 месяцев назад

Thanks for the feedback!

@eitantal726 7 месяцев назад

7:47 note about open-drain terminology: Drain is actually plus (aka VDD). Source is ground (aka VSS). Open-drain means I can only connect to VSS, but not to VDD. so when he said a "logic that opens and closes a drain", he meant logic that can *open and close a source*.

@pauldenisowski 7 месяцев назад

Yes, that’s what I meant :). Thanks!

@eitantal726 7 месяцев назад

9:52 detail about modes & speed: Clock stretching. If it wants to, during transfer the slave is allowed to hold the clock line low. The master has to wait until the clock line is released. The slave can effectively slow down the speed

@pauldenisowski 7 месяцев назад

Yes - I originally had a few slides about clock stretching but took them out in the interest of time / brevity. Thanks!

@GatoChupete Месяц назад

Ty 🐐

@dylanbaird74 7 месяцев назад

dawg🐐🐐🐐🐐

@neelakantannilakantanswami4031 4 месяца назад

Thanks for the Video. This Video was very Useful. Can you post another i2c video Explaining about the Arbitration Process and Clock Stretching Concepts ?

@pauldenisowski 3 месяца назад

I just had this discussion with someone at work yesterday and will probably do a follow-up deeper dive video later this year

@bramlemmens6984 5 месяцев назад

legend

@pauldenisowski 5 месяцев назад

Thanks you for the support!

@kakani7598 Год назад

Thank you for the excellent video. Could you share your slide?

@pauldenisowski Год назад

Thanks! We'll be publishing this same information in as a whitepaper / educational note as well.

@sha_guns 6 дней назад

hi do you have any recommendation software to draw sda and scl frames?

@arunbennett9248 9 месяцев назад

Can someone tell me how this ack bit works? As in the video it is set by the receiver. So, the sender send the data and the ack is set by the receiver at the end? If yes how it happens can anyone explain?

@andresbarrera515 9 месяцев назад

The sender sends the data, and the receiver responds to the received data with an ACK bit. Once the sender receives the ack bit, it continues sending the next byte, and waits again for the next ACK or NACK.

@ElectroWolf_Arts Год назад

im confused , lets take the example of a 16x2 LCD display with I2C module , the LCD have VCC, GND,V0, A and K pins which are the power and light, and there is the D0-D7, RW, RS AND E for typing the characters so how on earth can the I2C deal with the RW , RS and E signals while the 8 bit DATA are occupied for the D0-D7

@shuyuanliu9797 10 месяцев назад

That's a good question. 16x2 LCDs with the HD44780 controller chip (which is very common) can be configured to use a "4-bit mode" where only D4-D7 are used. In this mode, each data or command byte to the LCD is entered by sending two "half-bytes" in succession. This way D4-D7, RW, RS, E (and backlight control) can fit into 8 bits provided by the I2C I/O expander module. AFAIK, the LCDs with the PCF8574 I2C I/O expander all work this way. Even if this 4-bit mode didn't exist, you could choose a different I/O expander that provides more than 8 outputs. The PCF8574 happens to have only 8 outputs, so it uses the simplest protocol and just expects to be told the state of the 8 pins as a byte from I2C. However, for many other I2C I/O expanders especially those with more than 8 I/O lines, instead of just transferring a "plain" byte like that in each I2C frame, it expects commands telling it which pins to set high/low, which pins to set as inputs/outputs, etc. so that they are not limited to 8 I/O lines. An example of this is the TCA9539, a 16-bit I/O expander.

@ElectroWolf_Arts 10 месяцев назад

@@shuyuanliu9797 thank god ,, sombody gived me a direct answer , its seems like 4 bit mode is the trick here , 00100000 to set that mode and since the D0-D3 are all zeros they can be ignored all the time ,now i can design the logic gate level circuit of that and compile it to FPGA ...... man you are a legend

@robertwatsonbath Год назад

Nicely edited to remove the NXT reference. Thank you. You're welcome.

@rafayzzz9424 День назад

i lake you

@qwertz3813 Год назад

Is not I2C multimaster?

@pauldenisowski Год назад

Good question. Yes, I2C allows any node to be the master: whichever node initiates the start condition becomes the master (see slide 5). Many I2C systems are however operated such that only one node is ever the master, but the protocol does allow for multimaster operation.

@brahmendrakumarpujala694 5 месяцев назад

🎯 Key Takeaways for quick navigation: 00:00 🌐 *Overview of I2C Protocol* - Brief introduction to I2C protocol. - I2C developed by Philips in 1982. - Purpose: Short-distance data communication using a synchronous Master-Slave protocol. 01:12 🔄 *I2C Topology and Connection* - I2C topology involves a master connected to slave nodes. - Two shared lines: SDA (Serial Data) and SCL (Serial Clock). - Connection details: Shared pull-up resistors, dynamic addition/removal of devices. 01:40 📡 *I2C Frame Structure* - I2C frames initiated by start conditions. - Master sends slave address and read/write indication. - Frame ends with a stop condition, ensuring bus availability. 03:49 ⏰ *Timing Relationship in I2C* - SDA transitions only during the clock's low phase. - Ensures unambiguous start and stop conditions. - Crucial for preventing contention in data transmission. 05:02 🎭 *Read/Write Bit and Acknowledgment in I2C* - Read/write bit indicates the master's intention. - Acknowledge (ACK) bit confirms proper data reception. - NACK (Negative Acknowledge) signifies lack of acknowledgment. 06:00 📊 *Data Transmission and Byte Handling* - Data sent in 8-bit bytes, MSB first. - Each byte individually acknowledged. - Stop condition indicates the end of the frame. 07:38 🔗 *Role of Pull-Up Resistors in I2C* - Pull-up resistors maintain idle high state. - Open drain system ensures quick pull-down to ground. - Pull-up resistor values affect communication speed. 09:19 🚀 *I2C Bus Speed Modes* - Various modes with corresponding achievable speeds. - High-speed and Ultra-fast modes modify standard I2C behavior. - Practical data rate influenced by pull-up resistors and bus capacitance. 10:01 📝 *Summary of I2C Protocol* - I2C widely used for short-distance data exchange. - Master-slave communication through frames. - Pull-up resistors, open-drain, start/stop sequences are key elements. Made with HARPA AI