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HF Junction Box HFJ–3
Technical Documentation
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Technical Documentation
Exploded View
HF Junction Box HFJ–3
Assembly Parts
ITEM Q’TY CODE DESCRIPTION VALUE, TYPE
1 9450067 Cover 1D 21307
2 9510078 EMC cover 3D 21558
3 9450066 Bottom cover 1D 21305
4 4 6292014 PT screw KB25x16 FeZn
5 Type label HFJ–3
C1 0200180 BC4B junction module
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HF Junction Box HFJ–3
V271 4108639 Diode x 2 BAS28 75 V 250 mA SOT143
V272 4110195 Zener diode BZX84 5 % 18 V 0.3 W SOT23
V274 4200603 Transistor BCX17 pnp 45 V 500 mA SOT23
V292 4107160 Zener diode BZX84 5 % 12 V 0.3 W SOT23
V293 4106769 Zener diode BZX84 5 % 4.7 V 0.3 W SOT23
V311 4106769 Zener diode BZX84 5 % 4.7 V 0.3 W SOT23
V312 4106769 Zener diode BZX84 5 % 4.7 V 0.3 W SOT23
V340 4200917 Transistor BC848B/BCW32 npn 30 V 100 mA SOT23
V341 4200917 Transistor BC848B/BCW32 npn 30 V 100 mA SOT23
V342 4200909 Transistor BC858B/BCW30 pnp 30 V 100 mA SOT23
V343 4108639 Diode x 2 BAS28 75 V 250 mA SOT143
V344 4200909 Transistor BC858B/BCW30 pnp 30 V 100 mA SOT23
V345 4200917 Transistor BC848B/BCW32 npn 30 V 100 mA SOT23
V346 4200917 Transistor BC848B/BCW32 npn 30 V 100 mA SOT23
V347 4107160 Zener diode BZX84 5 % 12 V 0.3 W SOT23
D130 4375060 IC, MCU PLCC44
D131 4309914 IC, 6 x sch.inv 74HC14 SO14
N100 4305236 IC, 2 x comp. LM2903 SO8S
N110 4301199 IC, 2 x op.amp. LM2904 SO8S
N230 4300269 IC, 2 x op.amp. TL064ID SO14
N250 4303439 IC, af amp4w/14v 4–20v dil1TDA1904 DIL16S
N270 4301062 IC, regulator LP2951AC SO8S
N310 4309488 IC, 4 x bi.switch 74HC4066 SO14S
N320 4309488 IC, 4 x bi.switch 74HC4066 SO14S
X170 5416517 Modular jack 8 pin pcb
X210 5439668 Connector 2x2pole right angle pc PCB
X230 5407002 Jack 2,5mm horizo female pcb
X250 5407006 Jack 3,5mm horizo female pcb
X290 5401050 Modular jack 10 shielded pcb
7510302 Adhesive stick jet–melt tc–3748
9853993 PCB BC4B 114.3X79.5X1.6 D 2/PA
9853993 PC board BC4B 114.3x79.5x1.6 d 2/pa
Technical Documentation
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Technical Documentation
C295 2310488 Ceramic cap. 330 p 5 % 50 V 0805
C296 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C297 2310488 Ceramic cap. 330 p 5 % 50 V 0805
C298 2310488 Ceramic cap. 330 p 5 % 50 V 0805
C310 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C311 2604431 Tantalum cap. 10 u 20 % 16 V 6.0x3.2x2.5
C313 2310738 Ceramic cap. 4.7 n 20 % 50 V 0805
C340 2310424 Ceramic cap. 100 p 5 % 50 V 0805
C341 2310424 Ceramic cap. 100 p 5 % 50 V 0805
C342 2310791 Ceramic cap. 33 n 20 % 50 V 0805
L100 3607555 Coil 2 A d17x12mm
L101 3607555 Coil 2 A d17x12mm
L102 3607555 Coil 2 A d17x12mm
L161 3606946 Ferrite bead 0.2r 26r/100mhz 1206 1206
L210 3607898 Choke 2 A 900UH/1 kHz
B130 4501008 Crystal 7.3728 M 16PF 50PPM
V101 4215954 MosFet RFD14N05 n–ch 50 V 10 A TO252
V102 4200917 Transistor BC848B/BCW32 npn 30 V 100 mA SOT23
V103 4200909 Transistor BC858B/BCW30 pnp 30 V 100 mA SOT23
V104 4107160 Zener diode BZX84 5 % 12 V 0.3 W SOT23
V105 4108639 Diode x 2 BAS28 75 V 250 mA SOT143
V106 4200909 Transistor BC858B/BCW30 pnp 30 V 100 mA SOT23
V107 4200917 Transistor BC848B/BCW32 npn 30 V 100 mA SOT23
V108 4200917 Transistor BC848B/BCW32 npn 30 V 100 mA SOT23
V109 4110022 Schottky diode EC20QS06 60 V 2 A 5x2.5x2mm
V131 4108639 Diode x 2 BAS28 75 V 250 mA SOT143
V132 4106769 Zener diode BZX84 5 % 4.7 V 0.3 W SOT23
V133 4200917 Transistor BC848B/BCW32 npn 30 V 100 mA SOT23
V134 4106769 Zener diode BZX84 5 % 4.7 V 0.3 W SOT23
V135 4106769 Zener diode BZX84 5 % 4.7 V 0.3 W SOT23
V190 4200836 Transistor BCX19 npn 50 V 0.5 A SOT23
V191 4108639 Diode x 2 BAS28 75 V 250 mA SOT143
V192 4200917 Transistor BC848B/BCW32 npn 30 V 100 mA SOT23
V193 4200917 Transistor BC848B/BCW32 npn 30 V 100 mA SOT23
V194 4101653 Diode BYD17D 200 V 1.5 A SOD87
V195 4101653 Diode BYD17D 200 V 1.5 A SOD87
V212 4100218 Trans. supr. LDP24A 100 V 30A/40 ms AG
V213 4200603 Transistor BCX17 pnp 45 V 500 mA SOT23
V214 4200603 Transistor BCX17 pnp 45 V 500 mA SOT23
V215 4110195 Zener diode BZX84 5 % 18 V 0.3 W SOT23
V216 4200603 Transistor BCX17 pnp 45 V 500 mA SOT23
V217 4108639 Diode x 2 BAS28 75 V 250 mA SOT143
V218 4202456 MosFet IRFR9020 p–ch 50 V 8 A TO252
V219 4200836 Transistor BCX19 npn 50 V 0.5 A SOT23
V230 4110117 Zener diode BZX84 5 % 3.9 V 0.3 W SOT23
V270 4200836 Transistor BCX19 npn 50 V 0.5 A SOT23
HF Junction Box HFJ–3
DH–TS582
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HF Junction Box HFJ–3
C133 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C134 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C135 2310343 Ceramic cap. 22 p 5 % 50 V 0805
C136 2310343 Ceramic cap. 22 p 5 % 50 V 0805
C137 2310488 Ceramic cap. 330 p 5 % 50 V 0805
C138 2310488 Ceramic cap. 330 p 5 % 50 V 0805
C139 2604209 Tantalum cap. 1.0 u 20 % 16 V 3.2x1.6x1.6
C140 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C143 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C144 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C170 2310738 Ceramic cap. 4.7 n 20 % 50 V 0805
C171 2310738 Ceramic cap. 4.7 n 20 % 50 V 0805
C172 2604209 Tantalum cap. 1.0 u 20 % 16 V 3.2x1.6x1.6
C173 2604209 Tantalum cap. 1.0 u 20 % 16 V 3.2x1.6x1.6
C174 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C175 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C177 2310488 Ceramic cap. 330 p 5 % 50 V 0805
C190 2604209 Tantalum cap. 1.0 u 20 % 16 V 3.2x1.6x1.6
C191 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C213 2501605 Electrol. cap. 100 u 20 % 35 V RM3.5
C214 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C215 2604209 Tantalum cap. 1.0 u 20 % 16 V 3.2x1.6x1.6
C216 2507479 Electrol. cap. 1000 u 20 % 25 V 13x20mm
C217 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C220 2310488 Ceramic cap. 330 p 5 % 50 V 0805
C221 2310488 Ceramic cap. 330 p 5 % 50 V 0805
C230 2310463 Ceramic cap. 220 p 5 % 50 V 0805
C231 2604022 Tantalum cap. 0.1 u 20 % 35 V 3.2x1.6x1.6
C233 2310463 Ceramic cap. 220 p 5 % 50 V 0805
C234 2310505 Ceramic cap. 470 p 5 % 50 V 0805
C235 2310752 Ceramic cap. 10 n 20 % 50 V 0805
C250 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C251 2604431 Tantalum cap. 10 u 20 % 16 V 6.0x3.2x2.5
C252 2604209 Tantalum cap. 1.0 u 20 % 16 V 3.2x1.6x1.6
C253 2604431 Tantalum cap. 10 u 20 % 16 V 6.0x3.2x2.5
C254 2404094 Polyester cap. 470 n 10 % 63 V RM5
C256 2505261 Electrol. cap. 220 u 20 % 25 V 8.5x11.5
C257 2310752 Ceramic cap. 10 n 20 % 50 V 0805
C258 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C259 2310544 Ceramic cap. 1.0 n 5 % 50 V 0805
C270 2604127 Tantalum cap. 1.0 u 20 % 35 V 3.5x2.8x1.9
C271 2604209 Tantalum cap. 1.0 u 20 % 16 V 3.2x1.6x1.6
C272 2604127 Tantalum cap. 1.0 u 20 % 35 V 3.5x2.8x1.9
C273 2604431 Tantalum cap. 10 u 20 % 16 V 6.0x3.2x2.5
C291 2310784 Ceramic cap. 100 n 10 % 25 V 0805
C293 2310784 Ceramic cap. 100 n 10 % 25 V 0805
C294 2310488 Ceramic cap. 330 p 5 % 50 V 0805
Technical Documentation
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Technical Documentation
R302 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
R310 1416160 Melf resistor 100 k 1 % 0.2 W 0204
R311 1416160 Melf resistor 100 k 1 % 0.2 W 0204
R312 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
R313 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
R314 1414212 Chip resistor 330 k 5 % 0.1 W 0805
R315 1416160 Melf resistor 100 k 1 % 0.2 W 0204
R316 1416160 Melf resistor 100 k 1 % 0.2 W 0204
R317 1416160 Melf resistor 100 k 1 % 0.2 W 0204
R318 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R319 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R320 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R321 1416160 Melf resistor 100 k 1 % 0.2 W 0204
R322 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R324 1413642 Chip resistor 56 k 5 % 0.1 W 0805
R325 1413642 Chip resistor 56 k 5 % 0.1 W 0805
R326 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R327 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R328 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R340 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R341 1414406 Chip resistor 5.6 k 5 % 0.1 W 0805
R342 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R343 1412729 Chip resistor 33 k 5 % 0.1 W 0805
R344 1412536 Chip resistor 22 k 5 % 0.1 W 0805
R345 1414406 Chip resistor 5.6 k 5 % 0.1 W 0805
R346 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R347 1413716 Chip resistor 220 k 5 % 0.1 W 0805
R348 1413723 Chip resistor 470 k 5 % 0.1 W 0805
R349 1412536 Chip resistor 22 k 5 % 0.1 W 0805
R350 1412729 Chip resistor 33 k 5 % 0.1 W 0805
R351 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R352 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R353 1414406 Chip resistor 5.6 k 5 % 0.1 W 0805
C100 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C101 2505261 Electrol. cap. 220 u 20 % 25 V 8.5x11.5
C102 2404094 Polyester cap. 470 n 10 % 63 V RM5
C103 2404094 Polyester cap. 470 n 10 % 63 V RM5
C104 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C105 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C106 2310738 Ceramic cap. 4.7 n 20 % 50 V 0805
C107 2310488 Ceramic cap. 330 p 5 % 50 V 0805
C109 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C110 2310488 Ceramic cap. 330 p 5 % 50 V 0805
C111 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C130 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C131 2310791 Ceramic cap. 33 n 20 % 50 V 0805
C132 2310791 Ceramic cap. 33 n 20 % 50 V 0805
HF Junction Box HFJ–3
Original 50/96
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HF Junction Box HFJ–3
R159 1412729 Chip resistor 33 k 5 % 0.1 W 0805
R160 1413829 Chip resistor 10 5 % 0.1 W 0805
R170 1412261 Chip resistor 100 5 % 0.1 W 0805
R171 1412261 Chip resistor 100 5 % 0.1 W 0805
R172 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R173 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R174 1412303 Chip resistor 330 5 % 0.1 W 0805
R175 1412303 Chip resistor 330 5 % 0.1 W 0805
R190 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R191 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R192 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R193 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R194 1413804 Chip resistor 1.0 M 5 % 0.1 W 0805
R195 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R211 1413716 Chip resistor 220 k 5 % 0.1 W 0805
R212 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
R213 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R214 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R215 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R216 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R217 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
R219 1412729 Chip resistor 33 k 5 % 0.1 W 0805
R230 1414212 Chip resistor 330 k 5 % 0.1 W 0805
R235 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R236 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R237 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R250 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
R251 1413829 Chip resistor 10 5 % 0.1 W 0805
R252 1412729 Chip resistor 33 k 5 % 0.1 W 0805
R253 1412536 Chip resistor 22 k 5 % 0.1 W 0805
R254 1413829 Chip resistor 10 5 % 0.1 W 0805
R255 1412536 Chip resistor 22 k 5 % 0.1 W 0805
R256 1412303 Chip resistor 330 5 % 0.1 W 0805
R270 1414212 Chip resistor 330 k 5 % 0.1 W 0805
R271 1413804 Chip resistor 1.0 M 5 % 0.1 W 0805
R273 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
R275 1413804 Chip resistor 1.0 M 5 % 0.1 W 0805
R276 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R277 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R292 1412303 Chip resistor 330 5 % 0.1 W 0805
R293 1412303 Chip resistor 330 5 % 0.1 W 0805
R294 1412303 Chip resistor 330 5 % 0.1 W 0805
R295 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R296 1412261 Chip resistor 100 5 % 0.1 W 0805
R299 1413716 Chip resistor 220 k 5 % 0.1 W 0805
R300 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
R301 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
Technical Documentation
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Technical Documentation
HF Junction Box HFJ–3
Parts List BC4B (Version 2.1) Code: 0200180
ITEM CODE DESCRIPTION VALUE TYPE
R101 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
R102 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R103 1414212 Chip resistor 330 k 5 % 0.1 W 0805
R104 1412511 Chip resistor 18 k 5 % 0.1 W 0805
R105 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R106 1400844 Melf resistor 0.33 2 % 0.7 W 6.5x2.5
R107 1414406 Chip resistor 5.6 k 5 % 0.1 W 0805
R108 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R109 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R110 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R111 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R112 1414406 Chip resistor 5.6 k 5 % 0.1 W 0805
R113 1414406 Chip resistor 5.6 k 5 % 0.1 W 0805
R114 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R115 1411669 Chip resistor 22 5 % 0.1 W 0805
R116 1412536 Chip resistor 22 k 5 % 0.1 W 0805
R117 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R118 1412416 Chip resistor 2.2 k 5 % 0.1 W 0805
R119 1412430 Chip resistor 10 k 5 % 0.1 W 0805
R120 1412310 Chip resistor 470 5 % 0.1 W 0805
R132 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R133 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R134 1413804 Chip resistor 1.0 M 5 % 0.1 W 0805
R135 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R136 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R137 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R138 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R139 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R140 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R142 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R145 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
R146 1413804 Chip resistor 1.0 M 5 % 0.1 W 0805
R147 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R148 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
R149 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R151 1412409 Chip resistor 1.5 k 5 % 0.1 W 0805
R152 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R153 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R154 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R155 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R156 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R157 1413635 Chip resistor 100 k 5 % 0.1 W 0805
R158 1413804 Chip resistor 1.0 M 5 % 0.1 W 0805
Original 50/96
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HF Junction Box HFJ–3
Layout Diagram of BC4B (Version 04)
Technical Documentation
Page – 14
Original 50/96
Page 10
Technical Documentation
Circuit Diagram
HF Junction Box HFJ–3
Original 50/96
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HF Junction Box HFJ–3
Block Diagram
Technical Documentation
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Technical Documentation
HF Junction Box HFJ–3
Microphone Amplifier
Handsfree microphone signal is amplified in N230, and directed to handportable XMIC line or accessories MIC line in audio switch block. The accessory supply voltage +VBS must be turned on when this amplifier is
used, because it is supply voltage for this block too.
Signals Passed between the Mic. Amp. Block & Other Blocks:
Name Description
HF_MIC Amplified hands free microphone output signal to
audio switch –block.
+12V Supply voltage.
+2.4V Internal d.c. level reference.
X290.2 Hands free microphone input.
GAIN Gain selection input, low level at this input gives
higher gain.
Speaker Amplifier
This is 4 W power amplifier for hands–free loudspeaker. Audio signals
from handportable XEAR or accessories EAR lines are directed in audio
switch block to speaker amplifier N250. The gain is constant. The accessory supply voltage +VBS must be turned on when this amplifier is used,
because it is supply voltage for this block too.
Signals Passed between the Speaker Amp. Block & Other Blocks:
Name Description
+12V Supply voltage.
+2.4V Internal d.c. level reference.
HF_SP Hands–free speaker input.
X250.2 Hands–free speaker output.
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HF Junction Box HFJ–3
Technical Documentation
External I/O
This block consists of car ignition key sense and car radio mute. When
pin 2 at connector X210 is connected to car battery voltage, an interrupt
pulse for processor is generated. If processor is in power down mode it
wakes up. Processor can also read ignition key state. In power on mode
this state is continuously polled, and an mbus message is send to handportable, when this state changes.
Car radio mute is an open collector output capable of driving a relay. The
purpose is to mute car radio during conversation. This output has a short
circuit protection, which is triggered when pin 1 at X210 is directly connected to car battery voltage, while the output is turned on. When triggered output turns and stays off, until it has been turned off and on again.
Signals Passed between the Ext. i/o Block & Other Blocks:
Name Description
IGNS Car ignition key status to processor and interrupt
pulse
generator.
CRM CRM on/off control from processor.
X210.2 IGNS input in connector X210.
X210.1 CRM output in connector X210.
Power Supply
This block provides +5 V supply voltage for processor and +VCH voltage
for charger. When xear/hfpwr line is connected to ground via 100 kΩ resistor +5V voltage turns on. When +5 V is turned on, processor can control +VCH.
When supply voltage from car battery is too low or for some other reasons regulator N270 can’t give proper +5 V voltage, it gives an error signal. This error signal is used to disable charger and as a reset signal for
processor.
Signals Passed between the Power Supply Block & Other Blocks:
Page – 10
Name Description
+VBP Protected car battery voltage, supply voltage for this block.
+VCH Charger supply voltage.
HFPWR Power on/off control.
+5V +5V supply voltage, output of this block.
LO_V Low voltage error indication.
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Technical Documentation
HF Junction Box HFJ–3
Signals Passed between the Charger Block & Other Blocks:
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. Paths for microphone and ear/speaker signals between handportable and accessories, handportable and hands–free, hands–free and accessories are possible. XEAR and XMIC lines from the handportable includes a differential buffer amplifiers N230. Both audio paths have d.c.
decoupling capacitors. Internal d.c. levels are 2.4 V.
Signals passed between the audio switch block and other blocks:
Name Description
HP_HFS See description of control block
HP_EAR ”
HF_MIC ”
HF_EAR ”
HP_HFM ”
HP_MIC ”
+2.4V Internal d.c. levels
+5V External d.c. levels
SIDE_T Sidetone on/off
XEAR/HFPWR Received audio signal from handset
XMIC/JCONN Transmitted audio signal to handset
MIC Audio signal to/from accessories
EAR Audio signal to/from accessories
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HF Junction Box HFJ–3
Technical Documentation
Signals Passed between the Control Block & Other Blocks are:
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 Voltage for several pull–up resistors (see circuit diagram).
In power down mode this signal is low level, to reduce
current consumption.
XPWR Handset’s power on switch state.
IGNS Car ignition switch state.
RXD Mbus receive data.
TXD Mbus transmit data.
CRM Car radio mute
HP_MIC Audio switch control between handportable’s xmic
and accessories mic
HP_HFM Audio switch control between handportable’s xmic
and handsfree microphone
HF_EAR Audio switch control between accessories ear and
handsfree speaker
HF_MIC Audio switch control between accessories mic and
handsfree microphone
HP_EAR Audio switch control between handportable’s xear
and accessories ear
HP_HFS Audio switch control between handportable’s xear
and handsfree speaker
SIDE_T Sidetone from X170 MIC to EAR control.
CHV Charger voltage control, 12 or 15 V.
LO_V Low voltage indication. Generates reset for processor.
Charger
Page – 8
The charger is a switching mode voltage/current source. Switching frequency is fixed at approx. 80 kHz, generated by a separate RC oscillator.
The charger has voltage and current feedback. At a light load (less than
800 mA current), the charger acts as a 12 V (or 15 V) voltage regulator;
with a heavier load, it acts as a 800 mA current regulator. Input voltage
can be higher or lower than the output voltage.
Original 50/96
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Technical Documentation
7 XMIC/JCONN Audio signal from accessories or HF
8 XEAR/HFJPWR Audio signal from handportable (received
Functional Description
The BC4 module can be divided into seven blocks as follows:
– control
– charger
– audio switches
– external I/O
HF Junction Box HFJ–3
microphone to HP. 100 kΩ pull–up to +5 V;
d.c. level indicates connection of HFJ–3 box
to HP.
audio) to accessories or HF speaker. 1 MΩ
pull–up resistor to +VBAT. Drop down of current
from this pin turns on +5 V supply to processor.
– power supply
– microphone amplifier
– speaker amplifier
Control Block
Main parts of the control block are 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.
Interrupts are obtained from three sources: car ignition switch, handset’s
power switch, and mbus. Their purpose is to wake up the controller from
power down mode. Mbus is the interface between the handportable and
other accessories except the booster. There are bidirectional buffer in
mbus line, which regenerates the mbus signal.
Booster Interface (used only with NHC–1/3)
Tuning values from booster EEPROM are read immediately after power
on (handportable is connected to holder or wake up from power down). It
is possible to read EEPROM values via mbus request, but it should not be
done during conversation.
If booster EEPROM data and checksum are correct, tuning values are
send to the handportable and SCL/TXI line polling begins. If low level is
detected handportable is informed via mbus message. SCL/TXI line can
be used as output at the same time and controlledby mbus messages. If
no message is sent output state is ”high”. Periodically SCL/TXI is
changed to input and its state is read. This polling causes pulses, whitch
must be filtered in booster.
Original 50/96
Page – 7
Page 17
HF Junction Box HFJ–3
Accessory Connector X170
Pin Name Description
1 +VBS Power supply for accessories; HFJ–3 turns
2 DGND Digital ground.
3 M2BUS Serial mbus data between handset,
4 LSP Not connected.
5 PWR This signal is pulled to +5 V at HFJ–3 via
6 AGND Analog ground.
Technical Documentation
this voltage on and off under handportable
control.
HFJ–3 and accessories.
internal resistor. Indicates external handset
power on switch state to HFJ–3 box.
7 MIC Audio signal from accessories to hand
8 EAR Audio signal from handportable (received
Handportable Connector X290
Pin Name Description
1 SCL/TXI IIC bus clock for booster; this signal is pulled
portable (transmitted audio) or
HF speaker (voice dialer phrase,
answer machine message).
audio) or from HF microphone to accessories.
to +5 V at HFJ–3 via internal resistor of
processor. This pin is also used booster error
indication; in error condition, booster pulls this
pin down. This pin can be used as output to
booster at the same time. Periodically this pin
is changed to input for 60 µs time and TXI
state is polled. These polling pulses must be
filtered in booster.
Page – 6
2 PGND Ground for charger.
3 M2BUS Serial mbus data between handportable (HP),
HFJ–3 and accessories.
4 VC Supply voltage/charging current for HP.
5 HOOK/SDA Handset hook ind./IIC bus data for booster.
6 SGND Signal ground.
Original 50/96
Page 18
Technical Documentation
External Signals and Connections
The module is provided with five external connectors: power supply connector, external microphone connector, external speaker connector, handportable connector, and accessory connector.
Power Supply Connector X210
Pin Name Description
1 XCRM External car radio mute. open collector output;
HF Junction Box HFJ–3
when muted, state at this output is pulled
down, when not muted this output is in high
impedance state. Load relay should be
connected between this pin and +Vbat.
– on state max. voltage: +1 V
– on state max. current: 250 mA
– off state max. current: 1 mA
– load resistance min.: 64 Ω
2 IGNS Input controlling auto power off function. Should
switch) when in use and to ground when not in
3 GND Power supply ground, should be connected to
4 +VBAT Power supply voltage, should be connected to
External Microphone X230
Pin Name Description
1 GND Ground for external microphone.
2 HFMIC Supply voltage for microphone / audio signal
External Speaker X250
Pin Name Description
be connected to car ignition switch (after
use.
car battery negative terminal.
car battery positive terminal.
from microphone.
1 GND Ground for external speaker.
2 HFSP Audio signal to speaker/speaker indication
Original 50/96
d.c. signal.
Page – 5
Page 19
HF Junction Box HFJ–3
Booster Interface (used only with NHC–1/3):
When requested via mbus message, HFJ–3 can read booster tuning values from booster EEPROM and send them to the handportable. Tuning
values can also be written to booster EEPROM.
Technical Specifications
Modes of Operation
Power Off Mode
The battery voltage is always connected to accessory and charger power
switches. The rest of the circuitry does not receive supply voltages.
Power Down Mode
Technical Documentation
+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.
Page – 4
Original 50/96
Page 20
Technical Documentation
HF Junction Box HFJ–3
Introduction
The HFJ–3 hands–free junction box provides and controls the supply voltages for the accessories and charge current for the handportable. In addition, it controls the audio paths to accessories and hands–free equipment.
The unit contains a protection circuit against battery voltage transients,
power switch, hands–free speaker and microphone amplifiers, audio
switches, external I/O, switch mode charger and a microprocessor which
communicates with the handportable via the mbus interface.
HF Junction Box HFJ–3
Main Features
Accessories Supply Voltage
Filtered and switched voltages are supplied to peripheral devices and to
hands–free audio parts in the HFJ–3 box. Protection against disturbances, as overvoltages, transients in incoming battery voltage.
Audio Switches
Controls audio paths between handportable, hands–free equipment and
accessories.
Handsfree Audio Amplifiers
External microphone and speaker amplifiers for hands–free operation.
Charger
Provides supply voltage and charge current for handportable.
External I/O
Open collector output, capable of driving an external relay.
Original 50/96
Page – 3
Page 21
HF Junction Box HFJ–3
CONTENTS
HF Junction Box HFJ–3 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Features – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories Supply Voltage – 3. . . . . . . . . . . . . . . . . . . . . . . . .
Audio Switches – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Handsfree Audio Amplifiers – 3. . . . . . . . . . . . . . . . . . . . . . . . . .
Charger – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External I/O – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Booster Interface (used only with NHC–1/3): – 4. . . . . . . . . . .
Technical Specifications – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modes of Operation – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Off Mode – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Down Mode – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power On Mode – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Signals and Connections – 5. . . . . . . . . . . . . . . . . . . .
Power Supply Connector X210 – 5. . . . . . . . . . . . . . . . . . . .
External Microphone X230 – 5. . . . . . . . . . . . . . . . . . . . . . . .
External Speaker X250 – 5. . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessory Connector X170 – 6. . . . . . . . . . . . . . . . . . . . . . .
Handportable Connector X290 – 6. . . . . . . . . . . . . . . . . . . . .
Functional Description – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Block – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Booster Interface (used only with NHC–1/3) – 7. . . . . . . . . . .
Signals Passed between the Control Block & Other Blocks are: – 8. . . . .
Charger – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signals Passed between the Charger Block & Other Blocks: – 9. . . . . . . .
Audio Switches – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External I/O – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signals Passed between the Ext. i/o Block & Other Blocks: – 10
Power Supply – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signals Passed between the Power Supply Block & Other Blocks: – 10. .
Microphone Amplifier – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signals Passed between the Mic. Amp. Block & Other Blocks: – 11. . . . .
Speaker Amplifier – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signals Passed between the Speaker Amp. Block & Other Blocks: – 11. .
Block Diagram – 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Diagram – 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Layout Diagram of BC4B (Version 04) – 14. . . . . . . . . . . . . . . . . .
Parts List BC4B (Version 2.1) Code: 0200180 – 15. . . . . . . . . . .
Exploded View – 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly Parts – 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Documentation
Page – 2
Original 50/96
Page 22
After Sales Technical Documentation
HF Junction Box
HFJ–3
Original 50/96
NMP Part No. 0275274
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