Nokia PHF–5 After Sales Technical

After Sales Technical Documentation

COMPACT HANDSFREE

UNIT PHF±5

Original 05/97

NMP Part No. 0275040

Compact Handsfree Unit PHF±5

After Sales

Technical Documentation

AMENDMENT RECORD SHEET

Amendment	Date	Inserted By	Comments
Number

Page 2

Original 05/97

After Sales	Compact Handsfree Unit PHF±5
Technical Documentation

COMPACT HANDFREE UNIT PHF±5

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 4
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 4
Technical Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 4
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 4
List of Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 4
Basic Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 4
Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 5
Modes of Audio Output Destination and Hook . . . . . . . . . . . .	Page 5
Switching Delay between Handset Mode to/from HF Mode .	Page 5
External Signals and Connections . . . . . . . . . . . . . . . . . . . . . .	Page 6
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 7
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 7
Input Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 7
CAP interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 8
Audio In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 8
Audio Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 8
Device Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 8
Hook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 8
5 V Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 8
2 V and 4 V Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 8
Speaker Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 8
Headset Capsule Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 9
HF Microphone Preamplifier . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 9
Handset Microphone Preamplifier . . . . . . . . . . . . . . . . . . . . . . .	Page 9
Microphone Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 9
Hookoff Sense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 10
Muting Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 10
Power and Control Line Usage of Blocks . . . . . . . . . . . . . . . . . . .	Page 11
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 12
Circuit Diagram of DH6 (Versio 12 Edit 148 Code 0200658) . .	Page 13
Layout Diagram of DH6 for layout version 12 . . . . . . . . . . . . . . .	Page 14
Part List of DH6 (EDMS Issue 7.0 Code: 0200658)) . . . . . . . . .	Page 15
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 19
Assembly Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Page 20

Original 05/97

Page 3

Compact Handsfree Unit PHF±5

After Sales

Technical Documentation

Introduction

General

The PHF±5 is a compact handsfree unit for handportable telephones and it provides a possibility to use HF operation. The phone cannot be used as a handset but the PHF±5 can be upgraded with a handset and an antenna coupler.

The hook off ±signal is given to the phone when a handset is lifted from the hook. The PHF±5 has an internal speaker and external microphone.

Technical Summary

Operation

The PHF±5 can be powered by LCH±6 or LCM±1 rapid chargers to provide rapid charging for the phone also during a HF call. The LCH±8 tricle charger is not recommended for powering the PHF±5 because during a HF call there will be insufficient charging current available for the phone.

The phone is connected to the unit by a system connector. The cable length including the connector housing is 15 cm. The other connectors are d.c. jack

(input from the charger), microphone connector and a handset connector.

There is no RF connector or external speaker connector in the PHF±5.

The PHF±5 has an internal HF±speaker.

List of Modules

	Name of Module:	Material Code:
	HF speaker module DH±6	0200658
	Assembly parts MPHF±5	0260677
Basic Specifications
	Function:	Value:
	Input voltage	5.5...11 V d.c. typical range is
		6.5...7.5 V with LCH±6
	Current consumption	60 mA typical average during HF call
	Power source	LCH±6 or LCM±1 charger

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Original 05/97

After Sales

Compact Handsfree Unit PHF±5

Technical Documentation

Modes of Operation

Power Off

The module does not receive supply voltage from a charger to the d.c. connector. There are no voltages on the module.

Power on/Mute on

The d.c. voltage in the XEAR line is below 0.5 V. There is no audio input signal present. HF speaker amplifier and headset amplifier are muted. The current consumption is below 10 mA.

Power on/Mute off

The d.c. voltage in the XEAR line is above 1 V. If there is no handset connected or the handset is on hook, the XEAR signal is routed to the HF speaker and the HF microphone signal is routed to the XMIC line. If the handset is off hook, the XEAR signal is routed to the handset speaker and the handset microphone signal is passed to the XMIC line.

Modes of Audio Output Destination and Hook

The audio output is routed to handset connector if

±a handset is connected and it is lifted from the cradle

±a headset is connected

±a button headset is connected

Otherwise the audio output is routed to the internal speaker and HF microphone signal is routed to XMIC.

The hook off signal is passed to the phone if audio output is routed to external device. This means that whether a normal or a button headset is connected, the hook is also always off.

Switching Delay between Handset Mode to/from HF Mode

The internal logic for audio routing and hook signal includes a delay, which is to prevent erroneous behaviour of the whole system when switching between modes.

The hook signal for phone is given without any delay.

The audio routing is delayed for about 0.5 seconds, when the audio routing is to change from handset mode to HF mode. The delay is below 100 milliseconds, when the audio routing is to change from HF mode to handset mode.

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Compact Handsfree Unit PHF±5

After Sales

Technical Documentation

External Signals and Connections

D.C. Supply Connector X100
	Pin:	Signal name:	Function:
1		GND	Ground
2		VCC	Input from charger
			•min/max voltage: 5.5...10.8 V d.c.
			•min/typ/max current: 740...780...820 mA d.c.

LCH±6 or LCM±1

•min current: 285 mA d.c. LCH±8, not recommended

System Connector X250 (and System Cable Connector X200)

Pin(X200)	Signal name:	Function:
1 (1)	GND	Digital ground
2 (6)	XMIC	Microphone signal
		•nominal voltage: 60 mV
		•ld resistor/PHF±5: 22 kΩ to GND
		•ld resistor/hook off: 22 kΩ to GND
3 (5)	SGND	Signal ground
5 (2)	V_IN	Charge output for phone, connected to VCC
		•HF call min/typ/max curr: 630...730...810 mA
		•mute on min/typ/max curr: 730...775...820 mA
6 (4)	XEAR	Speaker signal
		•typ/max voltage: 60	...694 mV
		•mute on voltage: 0...	0.5 V d.c.
		•mute off voltage: 1...	1.6...	2 V d.c.
12 (3)	HOOK	Hook off to phone
		•min/typ/max voltage: 0...		0.2...0.4 V

pulldown at hook off

HF Microphone Connector X300

Pin:	Signal name:	Function:
1	GND	Ground
2	HFMIC	Microphone signal
		•typical/max. voltage: 2...30 mV
		•min/typ/max. bias voltage: 2...3.2...4.4 V d.c.

with load

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Original 05/97