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PAMS Technical Documentation
Loopset LPS-3
Issue 1 12/99
E Nokia Mobile Phones Ltd.
Loopset LPS-3
PAMS Technical Documentation
AMENDMENT RECORD SHEET
Amendment Date Number Inserted By OJuntune Comments
12/99
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Loopset LPS-3
CONTENTS Page No
Loopset LPS-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Basic Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . List of Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Loopset detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Loop Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Magnetic Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reception Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic Gain Control (AGC . . . . . . . . . . . . . . . . . . . . . . . . Magnetic Field frequency response window . . . . . . . . . Functional Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Distortion and noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Microphone response window . . . . . . . . . . . . . . . . . . . . . External Signals and Connections . . . . . . . . . . . . . . . . . . . . . . Exploded View of LPS-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Assembly parts of LPS-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts List of LPS3 ............................... 4 4 5 5 6 6 6 6 7 7 7 7 7 7 8 8 8 9 10 12 12 13
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Loopset LPS-3
Introduction
Hearing impaired people, who use hearing aids (HA), have problems in using cellular phones. They can't identify speech, partly due to poor S/Nratio and partly because of interference. Most HA have poor protection for interferences. By using the Loopset the interference problems are minimized. LPS3 is designed for DCT3.5, DCT3.75 and DCT 4 series phones. 4wire interface is implemented with 2.5mm diameter round plug/jack which is otherwise like "standard" stereo plug. The Loopset has been developed for hearing aid users to allow them to use mobile phones. It is based on induction technology. These kind of induction devices are widely used with hearing aids, but never before implemented with cellular phones. All hearing aids have support for induction loop, ie. they have a little telecoil inside. This coil can capture the signal supplied to the loop. Standard hearing aids have two operation modes; Mmode for normal microphone use and Tmode for telecoil use The Tmode is used in places where the inductive loop has been assembled, for example in public halls, churches and places of assembly. The reason for Tmode use is much better S/Nratio. The Loopset provides clear acoustic quality. The Loopset also dampens backgroud noise to make it easier to converse in a noisy environment, in the car for instance. The Loopset can be used with all the mobile phones, which supports normal headset and vibra alarm. Vibra is needed just for call indication. The earpiece of a headset is replaced by a wireloop. Loopset has also integrated microphone. The earpiece of a headset is replaced by a wireloop. Loopset has also integrated microphone. The function is very simple and the use is environmentally friendly. Loopset is passed around the neck. The system doesn't disturb anybody due to the silent service. When the phone is set to autoanswer mode, a user don't have to do anything but switch the hearing aid to Tmode. Loopset is an economic and simple solution for hearing aid users. Most hearing aids are compatible to this kind of wireless handsfree.
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Loopset LPS-3
Basic Specification
Unit LPS3 Max. dimensions (mm) (W x H x D) 37mm x 40mm x 17mm Notes Weight 60g
List of Modules
Name of module LPS3 Product LPS3 Module Assembly parts Type name LPS3 JL3 MLPS3 Material code 0630244 0201489 0262071 Note
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Recommended batteries:
Type Size / IECtype Min Vout Max Vout Rated capacity Talk time. Duration of the battery continuing 3mA on load 180 hour. Standby of dormancy. Battery continuing 20uA on load 840 hour or 35 day (1)
Zinc Air Hearing Aid Battery Silver Oxide Hearing Aid Battery Alkaline Battery
675 / PR44
1.15
1,40
540 mAh
675 / SR44
1.25
1,55
150 mAh
50 hour.
7 500 hour or 310 day.
675 / LR44
1.25
1,45
110 mAh
36 hour.
5 500 hour or 230 day.
(1) Note: The capacity of the zincair battery will fall 20% in a month. After the activation the zincair battery begins to selfdischarge. The battery will be empty at the latest within 5 week.
Technical Specifications
The Nokia LPS3 Loopset is powered by three hearing aid batteries and comes prepackaged with six zinc air batteries. The "auto answer" feature of the phone allows the users to be "hands free" while using either the Nokia LPS3 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 2,7 ... 4,5 V current peak 36 mA (nominal 3mA) Specification
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 offmode. Loopset detection In XMIC line there is a (47 + 2.2) kW pullup in phone. A microphone is a low resistance pull down compared to that.
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Loopset LPS-3
When there is no call going, AUXOUT is in high impedance state and XMIC is pulled up. When loopset is connected, XMIC is pulled down. XMIC is connected to HeadsetInt line (in MAD), so an interrupt is given due to both connection and disconnection. During a call there is bias voltage (1.5 V) in AUXOUT. The state of HeadsetInt can't be sure. It is better to disable loopset interrupt during a call and poll from EAD line (AD converter in CCONT) to see if loopset is disconnected. Actually disconnection of a headset without remote control switch could be seen in HookInt, but headset with the switch could not.
Loop Adapter
Connection resistance must be under 3m.
Magnetic Loop
The magnet field is based on the IEC 1184 and BS 6083 part 4 standard.
Specification
Reception Specifications
Type of Function Impedance Frequency responce Magnetic field Specification 100k ohm +/ 5 % at 1 kHz See figure 1 100mA/m (RMS) 3dB ref. 1kHz=0dB 400mA/m +12dB,125 ms RMS peaks 700mA(RMS) 3dB ref. 1kHz =>0dB 2,8A (RMS), 125 ms RMS peaks =>+12dB Response time <35 ms Resetting time 0,55dB/s 855 dB nominal level (122 mVrms)/ 1kHz Notes
The strength of the magnetic field measured next to the ear. (or measured in the horizontal plate and 170mm trip from the curve of the loop.)
Loop Current
Automatis Gain Control Signal to Noise Ratio
Maximum Ratings Determined as defined by IEC 268 using signal limited to frequency range 300 ... 3400 Hz.
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Magnetic Field frequency response window
dBr +10 +5 0 5 10 15
18 dB 3 dB 3 dB 3 dB 3 dB +3 dB +3 dB +3 dB +3 dB
20 250
300 Hz
3 kHz
500
1k
2k
4k
Functional Blocks
Table 1. Transmission Specifications Object Output impedance Frequency response Sensitivity Sensitivity dBm0 Sensitivity Sensitivity dBm0 Directivity mic (acuctic) Signal to Noise Ratio Specification 1600 ohm +/ 30% 1kHz See Figure 2 48 dB +6/3 dB at 1kHz 13 dBm0 +6/3 dBm0 at 1kHz 59 dB +6/3 dB at 1kHz 24 dBm0 +6/3 dBm0 at 1kHz OMNIdirectional 55 dB 1Pa/1kHz 0dBv/PA 0dBv/PA 4,7 dBPA 0dBv/PA. Notes
Distortion and noise Total distortion: Max 3 % 300...3400Hz with sound pressure 0 dBPa at the microphone.
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Microphone response window
dBr +10 +5 0 5
5 dB 3 dB 3 dB 3 dB 3 dB +3 dB +3 dB +3 dB +3 dB
10 15 20 250
300 Hz 3 kHz
500
1k
2k
4k
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External Signals and Connections
MicP
XMicP 47R 100k
MicN
XMic N
100k
COMP1
COMP2
Phone
Vbattery + GND COMP3 Shutdown Mic
VREF
Low signal + COMP4 RCOSC
COMP4
Peep
HF
XEarP 330R
10k
Vtoneout
LoopP
LoopN
HFCM
XEarN
= from Mobile = Internal LOOPSET signals
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Plug and X100 connector signals
Plug / Jack 1 Pin in x100 1 Name Function Min Typ Ma x Unit Description
XMicP Loopset microphone inin put (from accessory to phone) 2,4 1.1
1.6 400 200 2.8 6 2.2 3 0.3 0.1 1.0 0.3 5 0.8 0 1.2 10
kW mA mVpp
Loopset source AC impedance ref 1kHz Bias current Maximum signal level No Loopset (ref. XMicN). Loopset connected (ref. XMicN). Mic bias ON Loopset connected (ref. GND).
Loopset detection (from accessory to phone)
Ead / hookint mbus Ead / Hookint mbus 3 2 2 3 XMicN XEarN Ext accessory detection Bias OFF Button closed DCT3.n Mic bias ON
V V V
0 0.7 0 1.0
V
Loopset connected (ref. GND).
DCT4
Microphone + signal nF W nF 450 W Vpp Series output capacitance Output AC impedance ref 1kHz Series output capacitance Load AC impedance ref 1kHz Max. input level. No load EAR Signal (from phone to acces hone accessory) 150 47 10 300 2.0
4
4
XEarP
Ear + signals
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Exploded View of LPS-3
Assembly parts of LPS-3
ITEM 1 2 3 4 5 6 7 8 Q'TY CODE 0201489 9780260 9451692 9451691 6290021 9451693 9451694 9380750 DESCRIPTION Module Loop set Cable LPS3 Bcover Acover PT-screw Battery lid Button Type label VALUE, TYPE lps-3 DMJ00180 DMD05510 DMD05509 1,8x8 feznTX6 DMD05507 DMD05511
2
Note: The torque of the screws is 0.35 Nm.
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Parts List of LPS-3
ITEM (Version 6.1) CODE DESCRIPTION Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Tantalum cap. Tantalum cap. Ceramic cap. Tantalum cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Code: 0201179 VALUE TYPE 15 k 47 k 10 k 100 k 33 k 10 k 47 k 100 k 33 k 47 k 4.7 M 27 k 100 k 10 k 100 k 12 k 15 k 22 k 10 k 10 k 100 k 100 k 220 k 100 k 10 k 2.2 k 100 k 220 k 10 u 10 u 100 n 22 u 2.2 n 27 p 680 p 680 p 100 n 2.2 n 680 p 10 n 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0603 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 5 % 0.063 W 0402 20 % 10 V 20 % 10 V 10 % 16 V 0603 20 % 3.5x2.8x1.9 5 % 50 V 0402 5 % 50 V 0402 5 % 50 V 0402 5 % 50 V 0402 Y5 V 0603 10 % 16 V 0603 5 % 50 V 0402 5 % 50 V 0402 5 % 50 V 0603
R001 1430784 R003 1430796 R004 1430778 R005 1430804 R006 1430792 R018 1430778 R020 1430796 R021 1430804 R024 1430792 R025 1430796 R026 1430122 R027 1430790 R028 1430804 R031 1430778 R032 1430804 R033 1430780 R034 1430784 R035 1430788 R036 1430778 R037 1430778 R039 1430804 R041 1430804 R042 1430812 R043 1430804 R044 1430778 R046 1430762 R047 1430804 R048 1430812 C002 2610003 3.2x1.6x1.6 C005 2610003 3.2x1.6x1.6 C006 2320779 C008 2610101 C009 2320592 C010 2320546 C015 2320580 C017 2320580 C018 2320469 C021 2320779 C022 2320592 C023 2320580 C024 2320107
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C025 C026 C027 C029 C030 C031 C033 C034 C035 C038 C039 C040 C041 C053 C221 C261 C262 B001 Z001 Z002 T001 V400 V401 V405 V406 N003 N402 X100 X200
2320546 2320779 2320779 2320107 2320107 2320779 2320546 2320779 2320592 2320564 2320469 2320469 2320779 2320584 2320779 2320546 2320546 5140117 3640035 3640035 3640073 4219922 4219922 4219904 4219908 4340379 4340331 5409067 5400125 6400039 9854251
Ceramic cap. 27 p Ceramic cap. 100 n Ceramic cap. 100 n Ceramic cap. 10 n Ceramic cap. 10 n Ceramic cap. 100 n Ceramic cap. 27 p Ceramic cap. 100 n Ceramic cap. 2.2 n Ceramic cap. 150 p Ceramic cap. Ceramic cap. Ceramic cap. 100 n Ceramic cap. 1.0 n Ceramic cap. 100 n Ceramic cap. 27 p Ceramic cap. 27 p Cond.mic 45+3DB 33PF 2K Filt z>450r/100m 0r7max 0.2a 0603 Filt z>450r/100m 0r7max 0.2a 0603 Aftransformer for manual p&p smd Transistor x 2 Transistor x 2 Transistor x 2 UMX1 Transistor x 2 IC, 2xop amp 2.7/3v ssoLMC6572BIMM IC, Power amp. LM4862 PW SM, pin header 1x04 p1.25 1a s SM, pcb conn 4mm f Battery spring dmd03655 PCB LPS1 28.2X33.1X1.0 M4 24/PA
5 % 50 V 0402 10 % 16 V 0603 10 % 16 V 0603 5 % 50 V 0603 5 % 50 V 0603 10 % 16 V 0603 5 % 50 V 0402 10 % 16 V 0603 5 % 50 V 0402 5 % 50 V 0402 Y5 V 0603 Y5 V 0603 10 % 16 V 0603 5 % 50 V 0402 10 % 16 V 0603 5 % 50 V 0402 5 % 50 V 0402 D5.8/9.D5.8/9.0 0603 0603 SMD UM6 UM6 npn 40 V SOT363 SOT363 SSOP8 SO8S STR. 90deg lps1
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