Project computer engineering i2c quiz

What does I2C stand for, and who developed it

Inter-Integrated Circuit, developed by Philips Semiconductor in 1982

What are the two main lines in I2C communication

SDA (Serial Data Line) and SCL (Serial Clock Line)

What are the standard speeds for I2C communication modes

Standard Mode: 100 kbps, Fast Mode: 400 kbps, Fast Mode Plus: 1 Mbps, High-Speed Mode: 3.4 Mbps, Ultra-Fast Mode: 5 Mbps

What is the role of the controller and target in I2C

The controller initiates communication, and the target responds to the controller’s commands

What is the purpose of a START condition in I2C

To initiate communication, where the controller pulls SDA low while SCL is high

What is the purpose of a STOP condition in I2C

To terminate communication, where the controller releases SDA while SCL is high

How does an I2C controller signal if it wants to read or write

By setting the R/W bit (1 for read, 0 for write) following the address frame

What are pull-up resistors used for in I2C

To ensure SDA and SCL lines return to high when no device is pulling them low

Why is I2C called a half-duplex protocol

It can only send or receive data at any one time, not both simultaneously

What does an ACK (Acknowledge) signal represent in I2C

It indicates that the target device successfully received the byte of data

What is the purpose of an open-drain configuration in I2C

It allows multiple devices to share the same bus by pulling the line low when necessary

What is the difference between open-drain and push-pull outputs

Open-drain allows multiple devices to pull the bus low without causing a conflict, while push-pull can cause contention

What is arbitration in I2C, and why is it needed

Arbitration ensures that only one controller takes control of the bus when multiple controllers attempt to communicate simultaneously

What happens during a repeated START condition in I2C

The controller sends another START without releasing the bus, allowing for continued communication

Why is clock stretching used in I2C

To allow a slower target to hold SCL low, delaying the controller until it is ready

What does a NACK (Not Acknowledge) signal indicate

It shows that the target did not receive data properly or signals the end of data transfer

What is the structure of an address frame in I2C

A 7- or 10-bit address followed by the R/W bit

How does the SDA line behave to signal a logical ‘1’ or ‘0’

SDA is high for a ‘1’ during the SCL pulse and low for a ‘0’

What might cause communication failure on the I2C bus

Missing pull-up resistors, incorrect addresses, or signal noise

How does the I2C protocol ensure compatibility with different voltage levels

By using pull-up resistors that adjust voltage to the device’s supply level

What is a timing diagram in I2C, and why is it important

It shows the relationship between SDA and SCL, ensuring correct data timing and synchronization

How does I2C handle multiple devices on the same bus

Each device has a unique address, allowing the controller to select one at a time

What is a data frame in I2C

An 8-bit data byte followed by an ACK or NACK

What happens if two devices on the I2C bus have the same address

Address conflicts arise, causing communication errors

What is the role of the R/W bit in the address frame

It specifies whether the controller wants to read from (1) or write to (0) the target