It might be that device get damaged if Vdd_IO is too much higher than Vdd (spec says Vdd + 0.1V). On the otherhand, I have used 5V (4.95V) for both Vdd and Vdd_IO without any problems or damages, PIC is also running on 5V. Absolute maximum voltage for LIS302DL is +6V (both Vdd and Vdd_IO).
Can you measure how much current accelerometer is taking from supply?
-Gusse-
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