Issue 514: [Neo900] Hall switch for detecting back cover

Reported by Joerg Reisenweber, Nov 20, 2013

N900-schematics N5210 "uSD card hot-swap detection sensor"

seems according to 
http://www.hobbielektronika.hu/forum/getfile.php?id=60935 (Nokia 
5200 schematics) we might expect to see a "HED55XXU12" 
(N2400) there.
Supposed to be SOT-3 or SOT-23
http://www.jotrin.com/product/parts/HED55XXCU12

datasheet unobtainium

We're free to pick any convenient alternative from
http://it.mouser.com/Semiconductors/Sensor-ICs/Board-Mount-Hall-Effec
t-Magnetic-Sensors/_/N-6giy0?No=25&P=1z0z7pt et al
given the magnetic field sensing properties and formfactor meet our 
usecase

Comment 1 by Joerg Reisenweber, Nov 20, 2013

design purpose of magnetic sensor to detect back cover removed:
not only to faciliate uSD swap like on N900, but also prepare device 
for battery hotswap, by swirching off backlight, stopping data 
transfer via WWAN, charging "UPS" buffer capacitor

Comment 2 by Joerg Reisenweber, Nov 20, 2013

http://www.datasheet.in/datasheet-html/H/E/D/HED57XXU12_SAMSUNG.pdf.h
tml

HED57XXU12 "datasheet"

Comment 3 by Joerg Reisenweber, Nov 20, 2013

Semi-official replacement part:
http://elcodis.com/parts/4643677/A3212ELH.html#datasheet

Comment 4 by Nikolaus Schaller, Dec 14, 2020

Status: WontFix

GTA04b7/Neo900

Issue 514: [Neo900] Hall switch for detecting back cover