TMP75: Translating binary to temperature

/*
 *  ======== TMP75B_toIntCelsius ========
 *  Convert raw temperature register value to degrees Celsius rounded to the
 *  nearest integer
 */
int32_t TMP75B_toIntCelsius(int32_t x)
{
    /* Shift raw register value to form a proper Q4 value */
    x >>= 4;

    /* Optional: Add bias to round before the final truncation */
    x += (x >= 0) ? (1 << 3) : -(1 << 3);

    /* Convert Q4 value to whole number */
    x /= 1 << 4; /* use division so small negative values round to 0 */

    return x;
}

/*
 *  ======== TMP75B_toMilliCelsius ========
 *  Convert raw temperature register value to milli-degrees Celsius
 */
int32_t TMP75B_toMilliCelsius(int32_t x)
{
    /* Shift raw register value to form a proper Q4 value */
    x >>= 4;

    /* Scale to milli-degrees, convert Q4 value to a whole number */
    return ((1000 * x) >> 4);
}

/*
 *  ======== TMP75B_toFloatCelsius ========
 *  Convert raw temperature register value to degrees Celsius
 */
float TMP75B_toFloatCelsius(int32_t x)
{
    /* Shift raw register value to form a proper Q4 value */
    x >>= 4;

    /* Convert Q4 value to a float */
    return ((float)x * 0.0625f);
}

where input x is the two bytes read from I2C:

x = (((int32_t)(int8_t)rxBuf[0]) << 8) | rxBuf[1];

additionally, if only one byte is read, that byte is integer temperature in signed 8 bit format (signed char or similar.)