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What kind of impact can demage the L6470pd in that way?

Question asked by becher.dominik on Jun 27, 2016
Hi at all,
is there someone with an idea what has happened there with the L6470. I´ve attached 2 photos of the demaged device and on picture of the scematic sheet. It looks like the motor bridges are directly shorted to GND. The connected stepper motor is working well with an impedance of about 2.4Ω of each coil.
 The supply voltage of VSAx and VSBx is 35.5V.

Thanks for your help!