# Card.attn restarting my host and notecard when running under battery

**URL:** <https://discuss.blues.com/t/card-attn-restarting-my-host-and-notecard-when-running-under-battery/507>\
**Category:** Troubleshooting\
**Created:** [November 29, 2021, 7:49pm UTC](https://discuss.blues.com/t/card-attn-restarting-my-host-and-notecard-when-running-under-battery/507 "2021-11-29T19:49:10Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![bsatrom](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/bsatrom/32/3_2.png) [@bsatrom](https://discuss.blues.com/u/bsatrom)\
**Post date:** [November 29, 2021, 11:08pm UTC](https://discuss.blues.com/t/card-attn-restarting-my-host-and-notecard-when-running-under-battery/507/6 "2021-11-29T23:08:03Z")

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Hey @ssozonoff you can find the schematic [here](https://github.com/blues/note-hardware/tree/master/Notecarrier-AF/v1.7/Assembly%20Standard%20Build) in the `AssemblyDrawing.pdf` file.

See below. The `3V3` supply on the AF powers both the Notecard and Feather, the the `F_EN` pin goes to the Feather `EN` and `EN` on this `3V3` supply. You can test this yourself by removing the Feather from the AF and pulling `EN` to ground, which will disable the Notecard.

 ![Screen Shot 2021-11-29 at 5.51.50 PM](https://us1.discourse-cdn.com/flex020/uploads/blues/original/1X/30ccd6221a555df10645882e8267481c07698895.png)

There are a few other particulars to consider here with the AF and running on batter and in sleep mode, including needing a level-shifter on SCL/SDA to isolate the Notecard and Feather when the Feather is powered off. We’re considering improvements in a future spin of the board, but your best bet right now is to run off an AL if you’re looking to sleep a battery-powered host.

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