Contents
- 1 What is an I2C controller?
- 2 What is clock stretching in I2C protocol?
- 3 What does I2C stand for?
- 4 How many number of data can be transmitted between start/stop condition in I2C?
- 5 What is meant by open drain?
- 6 When does the clock line change in I2C?
- 7 What does open drain mean in an I2C bus?
- 8 How does I2C support multi-master bus system?
What is an I2C controller?
I²C (Inter-Integrated Circuit) Controller is a two-wire, bi-directional serial bus that provides simple and efficient method of data transmission over a short distance between many devices. Avalon compliant I²C Controller provides an interface between Nios II processor and I²C device.
What is clock stretching in I2C protocol?
Clock stretching allows an I2C slave device to force the master device into a wait state. A slave device may perform clock stretching when it needs more time to manage data, such as store received data, or prepare to transmit another byte of data.
Why is I2C open drain?
I2C is multi-master and multi-slave protocol. If the lines are not open drain then there may chance that one slave pulling the device low and other slave is trying to pull the same line high. This situation is called as the bus contention.
What does I2C stand for?
I2C
| Acronym | Definition |
|---|---|
| I2C | Inter-Integrated Circuit |
| I2C | Intelligent Controller |
| I2C | Inter Integrated Circuit |
| I2C | Interface to Communicate |
How many number of data can be transmitted between start/stop condition in I2C?
This means that you can have up to 128 devices on the I2C bus, since a 7bit number can be from 0 to 127. When sending out the 7 bit address, we still always send 8 bits. The extra bit is used to inform the slave if the master is writing to it or reading from it. If the bit is zero the master is writing to the slave.
Is I2C clock open drain?
I2C uses an open-drain/open-collector with an input buffer on the same line, which allows a single data line to be used for bidirectional data flow.
What is meant by open drain?
An open-drain or open-collector output pin is driven by a single transistor, which pulls the pin to only one voltage (generally, to ground). When the output device is off, the pin is left floating (open, or hi-z).
When does the clock line change in I2C?
According to I2C protocols, the data line can not change when the clock line is high, it can change only when the clock line is low. The 2 lines are open drain, hence a pull-up resistor is required so that the lines are high since the devices on the I2C bus are active low. The data is transmitted in the form of packets which comprises 9 bits.
Which is the start condition of the I2C bus?
A high to low transition of the SDA line while the SCL line is high called the START condition. The START condition is always asserted by the master. The I2C bus is considered busy after the assertion of the START bit. The STOP condition is asserted by the master to stop the communication.
What does open drain mean in an I2C bus?
Inter-Integrated Circuit (I2C) • The I2C bus drivers are OPEN DRAIN meaning that they can pull the corresponding signal line low, but cannot drive it high
How does I2C support multi-master bus system?
Arbitration – I2C protocol supports multi-master bus system but more than one bus can not be used simultaneously. The SDA and SCL are monitored by the masters. If the SDA is found high when it was supposed to be low it will be inferred that another master is active and hence it stops the transfer of data. Serial transmission –