Hello Nick,
the LMP91000 when supplied at 5V, and configured in order to use the supply as internal source of Voltage Reference is able to generate a maximum differential voltage between RE and WE pin which is 24% of the Voltage Reference, in this case means +/-1.2V (according to the programmed bias sign).
So accoirding to the operating range of the LMP91000 a differential voltage of 1.7V cannot be generated between RE and WE.
regards,
Domenico