Cannot understand the acknowledgement signal in I2c Bus-ADS1015 TI ADC chip

[kunal5959]

I have to access the ADC chip ADS1015 by sending data throughI2c bus. In the data sheet Yellow box highlights Read/write bit, Green is ACKnowledgement bit and the Red box is something which i do not understand, what it means. After that the second byte of data is sent to ADS1015.
Do i have to worry about generating that peak( inside red box). Can anyone suggest me what that peak means, or is it just a way showing end of 1st frame of data and beginning of second frame of data.

 

[std_match]

In the green box the master sends a '1' (really open collector with pull-up). The ack bit is generated by the slave, which during one bit (the green box) activates it's driver on the SDA line to send a '0'.
When the slave stops driving the SDA to '0' it can take some time before the master starts driving a '0' for the next byte. SDA will be pulled towards '1' when nothing is driving it to '0'. This is the reason for the possible "glitch" in the red box.

 

[kunal5959]

Thanks a lot for the reply. That really helped in understanding the SDA glitch better.