Pnphf Detection; Audio Internal; Earpiece/Ringer - Nokia RH-53 Manual
System module
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Also See for RH-53:
- Instructions manual (218 pages) ,
- Troubleshooting instructions (72 pages) ,
- Disassembly instructions manual (14 pages)
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RH-53/54
8-System Module
HOOKINT comparator thresh-
old
HEADINT comparator thresh-
old
VFLASH1 voltage regulator
Current source strength
Note that hysteresis of the comparators has been taken into account in the HOOKINT
and HEADINT Min and Max values.
PnPHF Detection
PnPHF accessory uses 4-wire fully differential audio connection. The accessory is detected by
the Headint signal when the plug is inserted.
■
Audio Internal
Earpiece/Ringer
The choosen transducer that shall be used both as earpiece and ringer is the 16 mm loud-
speaker called MALT.
The Earpiece/ringer solution will be build up around the 16 mm MALT speaker that shall be
used both as earpiece and ringer. This solution will implement polyphonic ringing tones.
The earpiece circuit includes only a few components:
-Two 10 ohm in order to have a stable output
The ringer circuit includes several components
-Four resistors for setting the boomer gain
ISSUE 1 09/2004
Vhook2
Vhead
VFLASH1
Ipullup
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
Nokia Customer Care
0.50 V
0.60 V
1.71 V
1.90 V
2.70 V
2.78 V
1 µA
2 µA
0.70 V
2.09 V
2.86 V
4 µA
23
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