Looking at This datasheet for the LSM9DS1TR 9-axis IMU, there is a pin labeled DEN_A/G with the description "Accelerometer and gyroscope data enable" on page 11.

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?

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    \$\begingroup\$ I found this post here asking the same question which appears to be answered, however it's functionality appears to be somewhat complex and I don't know the details of the chip enough to sum this up in an answer. community.st.com/s/question/0D50X00009XkhX7SAJ/… \$\endgroup\$ – Kevin Brant Jan 9 at 18:53
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    \$\begingroup\$ It doesn't look answered to me. I see a guess by someone who hasn't used the chip. If you go to the ST page for the device, there is an evaluation board, and the pin is broken out on it, but I can't find out what it does for sure. This would be enough to send me to another chip. \$\endgroup\$ – Scott Seidman Jan 9 at 19:03
  • \$\begingroup\$ @KevinBrant I have to say I agree with Scott Seidman. There was an attempt at an answer, but the register they mention (0x11h) they refer to by the name DEN Register Configuration. In the datasheet, 0x11h is called CTRL_REG2_G, and the uppermost three bits are explicitly 0s in the datasheet (Pg 47), not <Edge_Sens_EN, Level_Sens_EN_, Level2_Sens_EN> as the answerer mentions in that forum. \$\endgroup\$ – ambitiose_sed_ineptum Jan 9 at 19:53
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    \$\begingroup\$ I see, my mistake then. I will leave the comment as I think the page still may contain some useful information. \$\endgroup\$ – Kevin Brant Jan 9 at 20:11

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