Timeline for A strong neodymium magnet has no effect whatsoever on my phone compass. How is that possible?
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 20, 2019 at 10:52 | comment | added | akhmeteli | @Pieter : So far we cannot find reliable info on the Alps sensor principle, but at least some iphone compasses are definitely Hall effect (AK8973). | |
| Jul 20, 2019 at 10:22 | comment | added | user137289 | AMR sensors use much less current than Hall sensors for the same sensitivity, which is important in mobile phones. AMR devices have improved and now totally dominate the market for electronic compasses. Alps is well aware (but this is for a different application): alps.com/e/faq/sensor_magnetic/magnetic_switching.html | |
| Jul 20, 2019 at 9:54 | comment | added | akhmeteli | @Pieter : You don't think it is correct. Mouser thinks it is correct. With all due respect, your arguments are not convincing. For example, the previous magnetometer AK8973 used in iphones (memsjournal.com/2011/02/…) was a Hall effect sensor (pdf1.alldatasheet.com/datasheet-pdf/view/219477/AKM/AK8973.html) . | |
| Jul 20, 2019 at 7:11 | comment | added | user137289 | That is something Mouser wrote, I do not think it is correct. Alps holds some patents in AMR, and I believe theirs work in the same way as the competition: aerospace.honeywell.com/en/~/media/aerospace/files/… | |
| Jul 20, 2019 at 1:07 | comment | added | akhmeteli | @Pieter : A similar part is a Hall sensor (mouser.com/ProductDetail/ALPS/…) | |
| Jul 19, 2019 at 17:44 | comment | added | user4552 | This would be better as a comment. It isn't an answer. | |
| Jul 19, 2019 at 17:19 | comment | added | user137289 | It is a bit difficult to find documentation but I am convinced that these sensors by Alps Electric use AMR (anisotropic magnetoresistance) and not the Hall effect. | |
| Jul 19, 2019 at 14:41 | comment | added | Ronan Cremin | Right but shouldn't this be susceptible to the magnetic field from a nearby magnet? | |
| Jul 19, 2019 at 14:37 | history | answered | akhmeteli | CC BY-SA 4.0 |