Hi Koo,
I meant the content of the internal registers (that you have to set through the I2C bus in order to have the LMP91000 working).
By default the LMP91000 is in the deep sleep mode, so it doesn't mesure nothing until you change its mode of operation and properly configure it according to the sensor specs.
Please refer to the webench tool on www.ti.com to properly configure the LMP91000.
regards,
Domenico