After Sales Technical Documentation HF JUNCTION BOX HFJ–2 Original, 05/94 NMP Part No.
HF Junction Box HFJ–2 After Sales Technical Documentation AMENDMENT RECORD SHEET Amendment Number Page 2 Date Inserted By Comments Original, 05/94
After Sales HF Junction Box HFJ–2 Technical Documentation HF JUNCTION BOX HFJ–2 CONTENTS Page No Introduction 5 General 5 Main Features 5 Accessories Supply Voltage 5 Audio Switches 5 Handsfree Audio Amplifiers 5 Charger 5 External I/O 5 Booster Interface 5 Modes of Operation 5 Power–off Mode 5 Power–down Mode 6 Power–on Mode 6 External Signals and Connections 6 Power Supply Connector X210 6 External Microphone X230 6 External Speaker X250 6 Accessory Connector X170 7
HF Junction Box HFJ–2 After Sales Technical Documentation Assembly Parts 22 List of Figures Figure 1: Block Diagram 13 Figure 2: Component Layout Diagram 14 Figure 3: Exploded View 22 Figure 4: Circuit Diagram Page 4 NO TAG Original, 05/94
After Sales HF Junction Box HFJ–2 Technical Documentation Introduction General The HFJ–2 Handsfree Junction Box provides and controls the supply voltages for the accessories rge current for the phone. In addition, it controls the audio paths to the accessories and handsfree equipment.
HF Junction Box HFJ–2 After Sales Technical Documentation Power–down Mode +5 V supply voltages are switched on. The processor is in power down mode and its clock oscillator is not running. Power–on Mode The processor is executing code. +5 V supply voltages are on and other supply voltages are under processor control.
After Sales HF Junction Box HFJ–2 Technical Documentation Accessory Connector X170 Pin Name Description 1 +VBS 2 DGND Power supply for accessories; HFJ–2 turns this voltage on and off under phone control. Digital Ground. 3 M2BUS Serial mbus data between handset, HFJ–2 and accessories. 4 LSP Not Connected. 5 PWR 6 AGND This signal is pulled to +5 V at HFJ–2 via an internal resistor. Indicates external handset power–on switch state to HFJ–2. Analog Ground.
HF Junction Box HFJ–2 After Sales Technical Documentation Functional Description Circuit Description The BC4 module can be divided into seven blocks as follows: – control – charger – audio switches – external I/O – power supply – microphone amplifier – speaker amplifier Control Block The main parts of the control block are the microcontroller D130 (83C51FA), mbus, and interrupt logic. D130 controls the audio paths, the charger, external I/O, the booster interface and the accessory power switch.
After Sales HF Junction Box HFJ–2 Technical Documentation Name Description PWR_ON Accessory power switch on/off. CH_ON Charger on/off. SCL/TXI IIC bus clock for booster/booster error indication. IO_EN XPWR Voltage for several pull–up resistors (see circuit diagram). In power down mode, this signal is low level, to reduce current consumption. Handset’s power on switch state. IGNS Car ignition switch state. RXD Mbus receive data. TXD Mbus transmit data.
HF Junction Box HFJ–2 After Sales Technical Documentation Name Description +VPB Supply voltage for power section +VCH Supply voltage for oscillator and comparators CH_ON On/off control LO_V Low voltage turn off IO_EN Reference voltage +5 V +VC Output voltage/current PGND Ground for output (”power ground”) Audio Switches Audio paths are controlled by seven CMOS analog switches N320 and N310.
After Sales HF Junction Box HFJ–2 Technical Documentation External I/O The external I/O block consists of the car ignition key sense function and car radio mute function. When pin 2 at connector X210 is connected to the battery supply voltage, an interrupt pulse for the processor is generated. If the processor is in power down mode it powers up. The processor can also read the ignition key state.
HF Junction Box HFJ–2 After Sales Technical Documentation Microphone Amplifier The handsfree microphone signal is amplified in N230, and directed to the handportable XMIC line or the accessories MIC line in the audio switch block. The accessory supply voltage (+VBS) is the supply voltage for the Microphone Amplifier also and hence must be available. Signals passed between the mic. amp.
After Sales HF Junction Box HFJ–2 Technical Documentation Figure 1: Block Diagram Version 5.
HF Junction Box HFJ–2 After Sales Technical Documentation Figure 2: Component Layout Diagram Page 14 Original, 05/94
After Sales HF Junction Box HFJ–2 Technical Documentation Parts List ITEM CODE DESCRIPTION VALUE TYPE R101 R102 R103 R104 R105 R106 R107 R108 R109 R110 R111 R112 R113 R114 R115 R116 R117 R118 R119 R132 R133 R134 R135 R136 R137 R138 R139 R140 R142 R145 R146 R147 R148 R149 R151 R152 R153 R154 R155 1412409 1412430 1414212 1412511 1413635 1400844 1414406 1412430 1413635 1413635 1412430 1414406 1414406 1413635 1411669 1412536 1412430 1412416 1412430 1413635 1413635 1413804 1413635 1413635 1413635 141363
HF Junction Box HFJ–2 After Sales Technical Documentation R156 R157 R158 R159 R160 R170 R171 R172 R173 R174 R190 R191 R192 R193 R194 R195 R211 R212 R213 R214 R215 R216 R217 R219 R230 R235 R236 R237 R250 R251 R252 R253 R254 R255 R256 R270 R271 R272 R273 R290 R291 R292 Page 16 1413635 1413635 1413804 1412729 1413829 1412261 1412261 1412430 1413635 1412303 1412430 1412430 1412416 1412430 1413804 1413635 1413716 1412409 1413635 1413635 1413635 1413635 1412409 1412729 1414212 1412416 1412416 1412416 1412409
After Sales HF Junction Box HFJ–2 Technical Documentation R293 R294 R295 R296 R299 R310 R311 R312 R313 R314 R315 R316 R317 R318 R319 R320 R321 R322 R324 R325 R326 R327 R328 R340 R341 R342 R343 R344 R345 R346 R347 R348 R349 R350 R351 R352 R353 C100 C101 C102 C103 C104 1412303 1412303 1412430 1412261 1413716 1416160 1416160 1412409 1412409 1414212 1416160 1416160 1416160 1413635 1413635 1412416 1416160 1412416 1413642 1413642 1412430 1412430 1412416 1412416 1414406 1412430 1412729 1412536 1414406 1412416
HF Junction Box HFJ–2 After Sales Technical Documentation C105 C106 C107 C109 C110 C111 C130 C131 C132 C133 C134 C135 C136 C137 C138 C139 C140 C143 C144 C170 C171 C172 C173 C174 C175 C177 C190 C191 C213 C214 C215 C216 C217 C230 C231 C232 C250 C251 C252 C253 C254 C256 Page 18 2310791 2310738 2310488 2310791 2310488 2310791 2310791 2310791 2310791 2310791 2310791 2310343 2310343 2310488 2310488 2604209 2310791 2310791 2310791 2310738 2310738 2604209 2604209 2310791 2310791 2310488 2604209 2310791 2501605
After Sales HF Junction Box HFJ–2 Technical Documentation C257 C258 C270 C271 C272 C273 C291 C293 C294 C295 C296 C297 C298 C310 C311 C313 C340 C341 C342 L100 L101 L102 L103 L210 B130 V100 V101 V102 V103 V104 V105 V106 V107 V108 V131 V132 V133 V134 V190 V191 V192 V193 2310752 2310791 2604209 2604209 2604209 2604431 2310791 2310791 2310488 2310488 2310791 2310488 2310488 2310791 2604209 2310738 2310424 2310424 2310791 3606698 3607555 3607555 3606698 3607898 4501008 4100221 4200868 4200917 4200909 4107160
HF Junction Box HFJ–2 After Sales Technical Documentation V194 V195 V212 V213 V214 V215 V216 V217 V218 V219 V230 V270 V271 V272 V273 V274 V290 V291 V292 V293 V311 V312 V340 V341 V342 V343 V344 V345 V346 V347 D130 D131 N100 N110 N230 N250 N270 N310 N320 X170 X210 X230 Page 20 4101653 4101653 4100218 4200603 4200603 4110195 4200603 4108639 4209990 4200836 4110117 4200836 4108639 4110195 4116536 4200603 4106769 4106769 4107160 4106769 4106769 4106769 4200917 4200917 4200909 4108639 4200909 4200917 4200917
After Sales HF Junction Box HFJ–2 Technical Documentation X250 X290 5407006 5416517 4340082 9380149 3200047 7510302 9510077 9730043 9853848 0240120 Original, 05/94 Jack 3,5mm horizontal female pcb Modular jack 8 pin pcb IC, MCU PLCC44 Sticker brady lat–2–747 9.5x9.5 Ferrite ring d 3.5x1.3x4.3mm f2 Adhesive stick jet–melt tc–3748 Emc–chassis1 3D21557 THX–7X,THN–thx–7x,thn–7 Ns–strip 0.4x128 cuni12zn24–04 PC board BC4A 114.9x79.5x1.
HF Junction Box HFJ–2 After Sales Technical Documentation Figure 3: Exploded View Assembly Parts ITEM 1 1 2 3 4 5 C1 Page 22 Q’TY 4 CODE DESCRIPTION VALUE, TYPE 9450050 9450067 9510078 9450066 6292014 9370113 0200045 Cover 1D 21289 Cover 1D 21307 EMC cover 3D 21558 Bottom cover 1D 21305 PT screw KB25x16 WN1442 FeZn Type label 4D 21617 BC4 charging module Original, 05/94
