Code:
I2Cread SDA,SCL,%01110001,[DATAPCF]
depending if you're using an A version the control byte may differ.

Assuming your 4.7K pull-up (or lower) are on the I2C BUS, and you also have some on the PCF i/o... it should work.

if i remind correctly, prior to be able to read read from this device, all i/o have to be at high level.

i know i forgot something...