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XTR106: Vref and Vreg voltage is zero in XTR106

Part Number: XTR106

Hi

I have to design a 4-20 mA transmitter circuit for a load cell with 520ohm impedance.

I used XTR106 and circuit that mentioned in figure 5 of XTR106 datasheet.

but i don't have any Vref voltag for supplying my sensor means the voltage is zero so my current is zero too. (Vreg is zero too)

my circuit is:

I don't know what is the problem. maybe the the XTR106 was damaged but all 5 ICs that i bought had a same result.

I would be thankful if someone could help me...