After Sales Technical Documentation COMPACT HANDSFREE UNIT PHF–2 Original, 11/94 NMP Part No.
After Sales Compact Handsfree Unit PHF–2 Technical Documentation AMENDMENT RECORD SHEET Amendment Number Page 2 Date Inserted By Comments Original, 11/94
After Sales Compact Handsfree Unit PHF–2 Technical Documentation COMPACT HANDSFREE UNIT PHF–2 CONTENTS Page No Introduction 5 Technical Summary 5 List of Modules 5 Technical Specifications 6 Modes of Operation 6 Maximum Ratings 7 DC Characteristics 7 Control Signals 8 AC Characteristics 8 External Signals and Connections 9 Mechanical Characteristics 9 Functional Description 10 Circuit Description 10 Input Circuit 10 Power Control Logic 12 Switched Mode Power Supply 12 Audi
Compact Handsfree Unit PHF–2 After Sales Technical Documentation [This page intentionally left blank] Page 4 Original, 11/94
After Sales Compact Handsfree Unit PHF–2 Technical Documentation Introduction The PHF–2 Compact Handsfree Unit forms a major part of the Compact Handsfree Car Kit; the kit provides a simple–to–install, low cost handsfree facility for in–car use. The BABT approved version of PHF–2 is known as PHF–2X. Since both units are technically identical, all references to PHF–2 equally apply to PHF–2X. Technical Summary PHF–2 allows both handsfree (hf) and normal handset (hs) use of the phone.
After Sales Compact Handsfree Unit PHF–2 Technical Documentation Technical Specifications Modes of Operation Power Off : The DH3–module does not receive a supply voltage at the DC–connector (X100), hence no voltages are present on the module. Standby : The module receives a supply voltage at the DC– connector but the M2BUS–line (X400) is low (logic ”0” state) because the phone is off and the battery is fully charged. The switching regulator is off and there is no supply voltage for the audio.
After Sales Compact Handsfree Unit PHF–2 Technical Documentation Maximum Ratings PIN/ CONNECTOR LINE SYMBOL MAXIMUM UNIT/NOTES X100/1 VB 32 Vdc (without damage) X100/1 VB 1.3 Adc PIN/ CONNECTOR LINE SYMBOL MAXIMUM UNIT/NOTES X300/1 HFSP 3.5 Vrms X300/1 HFSP 3.0 W PIN/ CONNECTOR LINE SYMBOL MAXIMUM UNIT/NOTES X400/1 VC 13 Vdc X400/1 VC 870 mAdc X400/1 VC 150 mVp–p ripple 100...500kHz DC Characteristics Table 3.
After Sales Compact Handsfree Unit PHF–2 Technical Documentation Control Signals Table 5. Control Signals (DC–values) PIN/ CONNECTOR LINE SYMBOL MINIMUM TYPICAL/ NOMINAL MAXIMUM UNIT/NOTES X400/2 M2BUS 0 5 Vdc X400/3 PHFS 3.6 0 5.2 0.7 Vdc (speaker on) Vdc (speaker off) X400/4 GND (logic) 0 Vdc X400/5 AGND (audio) 0 Vdc X400/6 XEAR/HFJPWR 1 X400/7 XMIC/JCONN 0 X400/8 AGND (audio) 2.5 4 Vdc 10 Audio–Vdc 0 Vdc AC Characteristics Table 6.
After Sales Compact Handsfree Unit PHF–2 Technical Documentation External Signals and Connections Table 9. DC Supply Connector, Uin 13.2VDC PIN LINE SYMBOL PARAMETER 1 VB Input Current 1 VB Input Current 1 VB Input Current 2 GND Logic Ground MIN TYPICAL/ NOMINAL 50 MAX UNIT/NOTES 0.8 1 mA Power Off 70 90 mA Power On, No Charging 0.6 0.8 A Power On, Charging On Table 10. DC HF–microphone Connector PIN LINE/ SYMBOL PARAMETER MIN TYPICAL/ NOMINAL MAX 5.
After Sales Compact Handsfree Unit PHF–2 Technical Documentation Functional Description Figure 1: Block Diagram AUDIO REGULATOR THERMAL PROTECTION POWER SUPPLY HANDSFREE MICROPHONE AMPLIFIER SWITCHED MODE POWER SUPPLY HANDSFREE LOUDSPEAKER AMPLIFIER Circuit Description Input Circuit The input circuit contains the following components: – C1 – EMI capacitor – F1 – foil fuse – L1 / L2 – EMI suppressor chokes – V1 – voltage suppressor diode (zener type) Page 10 Original, 11/94
After Sales Compact Handsfree Unit PHF–2 Technical Documentation Figure 2: Component Layout Diagram Original, 11/94 Page 11
Compact Handsfree Unit PHF–2 After Sales Technical Documentation Power Control Logic Power is applied to the audio devices via P–FET V410 and 10V regulator N100 (VBSW) when the M2BUS signal goes high. The XEAR signal can also switch the power on for 5 seconds as the XEAR signal goes low. The same 5 second power–on also occurs when power is applied and the MBUS and XEAR signals are low. C11 acts as a timing capacitor to generate this second period.
After Sales Compact Handsfree Unit PHF–2 Technical Documentation Figure 3: Cable Interconnection Diagram Mini UHF Connector Mini RF Connector W001 X001 PHF–2 CONNECTOR (TO X400) PHONE CONNECTOR E1 X002_1 VC X1–1 VC WHITE E2 X002_3 XEXAUD /PHFS X1–2 XEXAUD /PHFS GREEN E3 X002_8 AGND S1 BLUE X1–3 HOOK E4 X002_6 XEAR X1–4 XEAR YELLOW E8 X1–5 DGND X002_4 DGND BROWN E5 X002_2 MBUS C1 68n X1–6 VC X1–7 MBUS RED E6 X002_5 AGND X1–8 AGND BLACK E7 X002_7 XMIC X1–9 XMIC ORANGE X1–1
Compact Handsfree Unit PHF–2 After Sales Technical Documentation Assembly Figure 4: Exploded View Page 14 Original, 11/94
After Sales Compact Handsfree Unit PHF–2 Technical Documentation Assembly Parts ITEM QTY CODE DESCRIPTION VALUE 1 1 9450368 Front Cover D6472 2 1 9450255 Cover B 1D22197 3 1 9450369 Cover C D6473 4 1 9380154 Type Label 4D22419 5 2 6293012 Pt–Screw KB22X8 WN1442 6 1 5140098 Loudspeaker 4C23574 7 1 0200376 DC7 Connector Module 8 1 9510211 Holder 4D24728 9 1 9309555 Loudspeaker Cloth A4D40368 10 1 5469800 Accessory Plug Casing MQ138–NKK 11 4 6292240 P
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