I can find no further explanation for this pin other than Figure 15 LSM9DS1 electrical connections (Page 27) which shows that DEN_A/G is an input. This is not the chip select pin; there is another pin, CS_A/G, for that already.
The Data Enable pin is not mentioned anywhere in the interfacing portion of the document (Section 5 on page 28). I plan on using this with SPI.
What should a data enable pin do? Does it need to be connected to a digital pin on my micro controller? Could I leave it with no connection? Or should it be directly connected to ground or VDD?