How to decipher this Microphone sensitivity Chart for Choosing a SPL meter
Microphones are typically specified in dB re 1 V/Pa. So am microphone with a sensitivity -44 dB (like this one http://www.panasonic.com/industrial/electronic-components/parametric-search.aspx?src=/www-cgi/jvcr13pz.cgi?E%2BSS%2B2%2BABA5010%2B0%2B4%2BAM) would produce 6.3mV RMS at 1 Pa of sound pressure. 1 Pa also corresponds to 94 dBSPL. So you can easily convert dB SPL in dB Pa by subtracting 94.

The datasheet for our microphone looks strange. I have never seen unit of 1.0V/0.1Pa before. This is potentially a print error. 

The weighting curves do indeed mimic the frequency response of the human auditory system at different overall levels. However they are all 0 dB at 1 kHz, so if you calibrate at 1 kHz the weighting doesn't matter.