Issue 513: proximity sensor obsolete

Reported by Joerg Reisenweber, Nov 20, 2013

Steps to reproduce the problem: for OSRAM SFH-7740-Z

Expected result: Mousser offers component

Actual result: Mousser says "obsolete"

see also SFH 7741-Z

Comment 2 by Joerg Reisenweber, Nov 20, 2013 
seems right component. Seems also available, despite OSRAM says 

Comment 3 by Joerg Reisenweber, Nov 20, 2013

According to
I suspect we have 7740 for camdoor slider. This seems not in line 
with the datashhets and Rprog in N900 schematics.

Comment 4 by Nikolaus Schaller, Nov 25, 2013

Yes, the 7740 looks quite like the one used. But what I wonder is 
why there is a proximity sensor at all. The main purpose should be 
to detect if the handset is hold to an ear and turn off speakers and 
display/keypad backlight. This means a sensor mounted in the display 
assembly. And not one near the camera?
Or did they simply use two of them in lack of some simpler sensor.

Comment 5 by Joerg Reisenweber, Nov 25, 2013

There are 2 similar proximity sensors, one in display half next to 
front camera [reflective optical switch N1540] with 
"incorrect" Rprog [R1541 150R], to detect when you hold 
phone to ear, to lock touchscreen and thus avoid false keypresses 
and to dim backlight. 
And a similar one [N5820 Main Camera Cover Switch] (though with a 
different "correct" Rprog [R5820 470R]) for sensing the 
black/white stripe on cam-door

Comment 6 by Joerg Reisenweber, Nov 25, 2013

operating range of the front proxi is ~30mm so it kicks in before 
you touch the screen with your ear.
The operating distance of main cam cover(door) switch is in the 
range of 1..2mm from sensor to black/white stripe on cam door inner 
side. AIUI the difference between 7741 and 7740 is for the distance 
they are designed for, according to Rprog is another means 
to determine operation distance, however 150R is not mentioned as 
valid vakue in the datasheet I have.

Comment 7 by Joerg Reisenweber, Nov 25, 2013

My suspicion is that they obsoleted the 7740 since the 7741 is doing 
the job just good enough to replace 7740

Comment 8 by Nikolaus Schaller, Dec 14, 2020

Status: WontFix

Created: 8 years 2 months ago by Joerg Reisenweber

Updated: 1 year 1 month ago

Status: WontFix

Followed by: 1 person