Question

For receiving the acknowledgment

(a) SDA from the transmitter should be high

(b) SDA from the transmitter should be low

(c) SDA from receiver should be high

(d) SDA from receiver should be low

This question was posed to me in a national level competition.

The question is from I2C Protocol in portion AVR Microcontroller of Microcontroller

Answer 1

Correct option is (d) SDA from receiver should be low

Explanation: The packet format in I2C consists of 9 bits, out of which first 8 are the data bits while the ninth bit is the acknowledgment bit. For obtaining the acknowledgment, the SDA line of the receiver should be pushed to low.