How do I isolate I2C bus?

How do I isolate I2C bus?

Signal isolation for the I2C bus can be achieved with two methods. The first method is to use a digital isolator with external circuitry to separate the bidirectional data path into two unidirectional channels.

What is an I2C isolator?

I2C Isolators iCoupler is a magnetic isolation technology with functional, performance, size, and power consumption advantages compared to optocouplers. By integrating iCoupler channels with semiconductor circuitry, our technology enables a complete, isolated I2C interface with a small form factor.

What is I2C bus connection?

I2C (Inter-Integrated Circuit, eye-squared-C), alternatively known as I2C or IIC, is a synchronous, multi-master, multi-slave, packet switched, single-ended, serial communication bus invented in 1982 by Philips Semiconductors.

How do I use I2C bus?

A basic Master to slave read or write sequence for I2C follows the following order:

1. Send the START bit (S).
2. Send the slave address (ADDR).
3. Send the Read(R)-1 / Write(W)-0 bit.
4. Wait for/Send an acknowledge bit (A).
5. Send/Receive the data byte (8 bits) (DATA).
6. Expect/Send acknowledge bit (A).
7. Send the STOP bit (P).

What is digital isolator?

Digital isolators are integrated devices used to isolate digital signals and transfer digital communication across an isolation barrier. The input signal is modulated through a transmit IC and then passed through a high voltage capacitive barrier and across the connecting bond wire to the receiving side IC.

How many devices can be on the I2C bus?

128 devices
I2C Device Addressing This means that you can have up to 128 devices on the I2C bus, since a 7bit number can be from 0 to 127.

What is the difference between I2C and UART?

I2C, however, uses a master/slave configuration that uses clock signals to help synchronize the data being read or transmitted by the devices. UART, on the other hand, is hardware that is responsible for implementing asynchronous serial data streams for point to point connection and includes no clock signal.

When would you use a digital isolator?

Ideally, digital inputs and outputs are identical when an input signal is applied. As mentioned earlier, digital isolators are most commonly used with isolated power supplies in separate grounds, which is also useful in preventing ground interference and noise currents from power supplies.

How does the two wire bus work in I2C?

This analogy describes how I2C works. In I2C, there is an explicit set of rules that tell each device how to communicate on the shared system resource: the two wire bus (clock, and data). If all devices on the bus follow the specification, and the system is designed reasonably well, then the I2C devices can communicate with each other.

How are start and stop bits generated in I2C?

START (S) and STOP (P) bits are unique signals that can be generated on the bus but only by a bus master. Reception of a START bit by an I2C slave device resets its internal bus logic. This can be done at any time so you can force a restart if anything goes wrong even in the middle of communication.

What makes an I2C protocol more robust than SPI?

Unlike the SPI protocol, the I2C protocol has an acknowledgement feature that means a sending device knows that a receiver has accepted the data. So I2C is more robust in a noisy environment. Using I2C it is also possible to have multiple master devices making the system more flexible.

What do you need to know about I2C extenders?

Warning: The protocol is designed for single board communication it is not a long distance communication system. You can find instances (horror stories) of people designing a multi drop inter office communication system with I2C extenders – just don’t do it – it ends in tears!

https://www.youtube.com/watch?v=HGX457RA4IU