THERM_READ_TEMP
cur_temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9)) >> 1;
i = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
ret = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));