Contents
What is the main purpose of the SDA I2C signal?
SDA (Serial Data) – The line for the master and slave to send and receive data. SCL (Serial Clock) – The line that carries the clock signal. I2C is a serial communication protocol, so data is transferred bit by bit along a single wire (the SDA line).
Which Cannot be used for long distance communication?
Ground waves are the radio waves that travel along the surface of the Earth. This loss in power of ground waves increases with the increase in frequency. Thus, ground wave communication is not suited for high frequency.
Which of the following can not be used for long distance communication?
Which of the following can be used for long distance communication? Explanation: A slightly different serial port called RS232 is used for long distance communication, otherwise the clock may get skewed. The low voltage signal also affects the long distance communication. 2.
What happens when the I2C bus is idle?
When the I2C bus is idle both the SDA (data) and SCL (clock) lines are held HIGH by the Master. In order the begin exchanging data the Master puts the bus into Start Condition. It signifies this by changing the state of the DSDA line from HIGH to LOW.
What is the difference between SDA and I2C?
It uses two wires for communications and another two for power and ground. SDA – This is the serial data line. I2C is a unidirectional system, so data can only travel in one direction at any given moment.
What should voltage level be on SDA and SCL?
The voltage level on SDA and SCL must be Vcc as long as the bus is idle and drop near GND if shorted to GND. [Note: Very few I2C masters exist which drive SCL high and low, i.e. the SCL line is not open-drain.
What is the low level threshold for I2C?
The I2C standard defines the low-level threshold with 0.3 Vcc, the high-level threshold with 0.7 Vcc. Modifying the termination resistance Rp, the serial resistors Rs or lowering the SCL clock rate could help here. Are there spikes or noise on SDA, SCL or even Vcc?