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Technical Specifications; Functional Description; Modes Of Operation; Loopset Detection - Nokia Loopset LPS-3 Technical Documentation Manual

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Loopset LPS-3
Recommended batteries:
Type
Size /
IEC–type
Zinc Air
675 /
Hearing
PR44
Aid Bat-
tery
Silver Ox-
675 /
ide Hear-
SR44
ing Aid
Battery
Alkaline
675 /
Battery
LR44
(1) Note: The capacity of the zinc–air battery will fall 20% in a month.
After the activation the zinc–air battery begins to self–discharge. The bat-
tery will be empty at the latest within 5 week.

Technical Specifications

The Nokia LPS–3 Loopset is powered by three hearing aid batteries and
comes pre–packaged with six zinc air batteries.
The "auto answer" feature of the phone allows the users to be "hands
free" while using either the Nokia LPS–3 Loopset or headset accessories.
The interface between Loopset and phone is similier to a headset. Except
the hight impedance input.
Name of function
Supply voltage
Supply current

Functional Description

Modes of Operation

When the Loopset is identified the audio of the phone will be routed to the
Loopset and the identification voltage is turned ON. Mic bias voltage 2.1V
is turned ON only in call state.
When the phone is turned off also the Loopset is in off–mode.

Loopset detection

In XMIC line there is a (47 + 2.2) kW pull–up in phone. A microphone is a low
resistance pull down compared to that.
Page 6
Min Vout
Max Vout
1.15
1,40
1.25
1,55
1.25
1,45
E Nokia Mobile Phones Ltd.
PAMS Technical Documentation
Rated ca-
Talk time. Dura-
pacity
tion of the bat-
tery continuing
3mA on load
540 mAh
180 hour.
150 mAh
50 hour.
110 mAh
36 hour.
Specification
2,7 ... 4,5 V
current peak 36 mA (nominal 3mA)
Standby of dor-
mancy. Battery
continuing
20uA on load
840 hour or
35 day (1)
7 500 hour or
310 day.
5 500 hour or
230 day.
Issue 1 12/99

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