Hello Natailia,
I can help you with this as long as you are able to program your PIC16F690. If you already have your I2C lines connected to TMP112, its just a matter of reading register 0 of TMP112. More details about how to do this is in figure17 of data sheet:
http://www.ti.com/lit/ds/symlink/tmp112.pdf
Regards,
Abhi