Hello Shabbir,
Thanks again for the detailed explanation of your requirements. I have a suggestion other than your General call/software reset option.
Put the device in Comparator mode (POL=0) then Set the Thigh and Tlow.Once the temperature exceeds Thigh, ALERT will go Low (active). Now using the host controller keep reading temperature from TMP102 to continuously monitor the current temperature. Once you think you are ready to take action, program the Tlow register to a value that is less than the current temperature value. By doing this you will be dynamically programming the Tlow limit on order to reset the ALERT back to default state (high).
I hope this helps.
Best Regards,
Abhi