Motorola Gm Series Detailed 6864115b62 B Manual
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Controller T12 / Schematic Diagrams3-47 9C0325 0.1uFNU 10K R0332C0331 0.1uF U0331-2 PWR_GND 3GND5VCC 2C0354 0.1uF C0342 18K U0341-2 LM2904 6 57 8 42 5VDD 3VSS 6 0.1uF C0302 10 R0343 0 RX_AUD_RTN5VD FLAT_RX_SND 3V3 SPI(0:10)R0324 C0303 100pF 0.1uF C03050.1uF C0343 0.1uF 1uF C0324U0351 LP2951ACMM-3.3 2C0351 0.1uF 74AHCT1G125U0331-1 2 A 1 OE 4 Y33uF C0353 .022uF C0352 10K R0333SS 9 VCCA26 VCCD7 VSSA11 VSSA217 VSSA318VSSD12 XCLK 6 10K R0341 D0301 5 3 1 24 8 4 U0342 TC4S66F 4CNTL 1 47K R0346 47K R0347 1uF C0341 0.1uFC0304 LM2904 U0341-1 2 31 C0344 0.1uF 80.1uF C0301 CLK DATA5109152M01 VS_CS MISO VS_CS56K R0344 R0335 150K 5.1K R0345 NC414 NC515 NC616 NC719 NC821 NC923 RAC 2SCLK 8 INT MISO 11MOSI 10NC13 NC1027 NC1128 NC24 NC313 U0301 22 AMCAP ANA_NEG 24 ANA_POS 25AUDOUT20 5 10K R0331 1.8K R0342ERROR5 FEEDBACK 7 GND 4 INPUT 8 OUTPUT1 SENSE2 SHUTDOWN 3 VTAP 18K R0323 VS_MIC VS_RAC3V3 3V35VD 5VD 5VD VS_INT5VD5VD VS_AUDSEL 5VD ZWG0130530-O Controller T12 Schematic Diagram - Voice Storage
3-48Controller T12 / Schematic Diagrams7.1 Controller T12 Parts List Circuit RefMotorola Part NoDescriptionC0101 2113740F51 100pF 5% 50V C0107 2113741F25 1nF 50V C0112 2113743E20 100nF 16V C0121 2113743E20 100nF 16V C0122 2113743E20 100nF 16V C0131 2113740F35 22pF 5% 50V C0132 2113740F35 22pF 5% 50V C0141 2113743E20 100nF 16V C0151 2113741F49 10nF 50V C0201 2311049A57 10uF 10% 16V C0202 2311049A57 10uF 10% 16V C0204 2113743E20 100nF 16V C0212 2311049A57 10uF 10% 16V C0221 2113743E20 100nF 16V C0222 2113743E20 100nF 16V C0223 2113743E20 100nF 16V C0224 2113740F51 100pF 5% 50V C0225 2113743E20 100nF 16V C0226 2113743E20 100nF 16V C0228 2311049A56 4.7uF 10% 16V C0231 2113743B29 1 UF 10% 16V C0232 2113743E20 100nF 16V C0234 2113743E20 100nF 16V C0235 2113743E07 22nF 16V C0236 2113743E10 .033UF 10% C0241 2113743E20 100nF 16V C0243 2113740F51 100pF 5% 50V C0244 2113743E20 100nF 16V C0245 2113743E20 100nF 16V C0246 2113741F49 10nF 50V C0251 2113743E20 100nF 16V C0252 2311049A07 1uF 10% 16V C0254 2113743E20 100nF 16V C0255 2113743E20 100nF 16V C0256 2113740F51 100pF 5% 50V C0261 2113743E20 100nF 16V C0262 2113740F49 82pF 5% 50V NP0 C0265 2113743E20 100nF 16V C0267 2113741F49 10nF 50V C0271 2113741F49 10nF 50V C0272 2113743E20 100nF 16V C0273 2113741F37 3.3nF 50V C0275 2311049A99 47uF 20% 10V C0276 2113741F25 1nF 50V X7R C0277 2113741F25 1nF 50V X7R C0290 2311049C01 10uF (only LowBand) C0291 2311049C01 10uF (only LowBand) C0292 2311049C01 10uF (only LowBand) C0293 2311049C01 10uF (only LowBand) C0301 Used in2311049A07 GM1280 onlyTANT CP 1uF 10% 16VC0302 Used in 2113743E20 GM1280 only 100nF 16V C0303 Used in2113740F51 GM1280 only100pF 5% 50V C0304 Used in 2113743E20 GM1280 only 100nF 16V C0305 Used in2113743E20 GM1280 only100nF 16V C0324 Used in 2113743E20 GM1280 only 100nF 16V C0331 Used in2113743E20 GM1280 only100nF 16V C0341 Used in 2311049A07 GM1280 only TANT CP 1uF 10% 16V C0342 Used in2113743E20 GM1280 only100nF 16V C0343 Used in 2113743E20 GM1280 only 100nF 16V C0344 Used in2113743E20 GM1280 only100nF 16V C0351 Used in 2113743E20 GM1280 only 100nF 16V C0352 Used in2113743E07 GM1280 only22nF 16V C0353 Used in 2311049A97 GM1280 only TANT CHIP 33 UF C0354 Used in2113743E20 GM1280 only100nF 16V C0421 2113743N48 82.0 PF 5% C0422 2113741F17 470pF 50V C0423 2113741F17 470pF 50V C0426 2113743L09 470 PF 10% C0427 2113743L09 470 PF 10% C0428 2113743N48 82.0 PF 5% C0429 2113743L09 470 PF 10% C0430 2113741F17 470pF 50V C0431 2113741F17 470pF 50V C0441 2113743L09 470 PF 10% C0442 2113743L09 470 PF 10% C0445 2113743L09 470 PF 10% C0446 2113743L09 470 PF 10% C0447 2113743L09 470 PF 10% C0448 2113743L09 470 PF 10% C0449 2113743L09 470 PF 10% C0470 2113743L09 470 PF 10% C0471 2113743N48 82.0 PF 5% C0472 2113743N48 82.0 PF 5% C0473 2113743N48 82.0 PF 5% C0474 2113743L09 470 PF 10% C0476 2113743L09 470 PF 10% C0477 2113743L09 470 PF 10% Circuit RefMotorola Part NoDescription C0478 2113743L09 470 PF 10%C0482 2113743L09 470 PF 10% C0483 2113743L09 470 PF 10% C0484 2113741F17 470pF 50V C0485 2113743L09 470 PF 10% C0486 2113743L09 470 PF 10% C0487 2113743L09 470 PF 10% C0488 2113743L09 470 PF 10% C0490 2113743L09 470 PF 10% C0491 2113743L09 470 PF 10% C0492 2113743L09 470 PF 10% C0493 2113743L09 470 PF 10% C0494 2113743L09 470 PF 10% C0495 2113743L09 470 PF 10% C0496 2113743L09 470 PF 10% C0497 2113743L09 470 PF 10% C0499 2113743L09 470 PF 10% C0501 2113741F49 10nF 50V C0502 2113741F17 470pF 50V C0503 2113741F17 470pF 50V C0504 2113741F17 470pF 50V C0505 2113741F17 470pF 50V C0506 2113741F17 470pF 50V C0508 2113741F17 470pF 50V ( C0509 2113741F17 470pF 50V C0510 2113741F17 470pF 50V C0511 2113741F17 470pF 50V C0512 2113741F17 470pF 50V C0513 2113741F17 470pF 50V C0514 2113741F17 470pF 50V C0515 2113741F17 470pF 50V C0516 2113741F49 10nF 50V C0517 2113743N48 82.0 PF 5% C0518 2113741F17 470pF 50V C0541 2311049A05 470nF 10% 25V C0542 2311049A99 47uF 20% 10V C0560 2113743L17 1nF 10% C0591 2113743E20 100nF 16V C0592 2113743E20 100nF 16V C0593 2113741B69 100nF 50V C0601 2113741F17 470pF 50V C0603 2380090M24 LYT 10uF 50V 20% C0611 2311049C06 CP 22uF 20% 35V C0612 2113743E20 100nF 16V C0622 2311049A99 CP 47uF 20% C0641 2113741F17 470pF 50V C0644 2311049A97 CHIP 33 UF C0645 2113743E20 100nF 16VD C0652 2311049A97 CHIP 33 UF 16 C0654 2311049A57 CP 10uF 10% 16V C0655 2113743E20 100nF 16V Circuit RefMotorola Part NoDescription C0661 2311049C05 CP 47uF 10% 16V C0662 2113741F49 10nF 50V C0663 2113743E20 100nF 16V C0671 2113743E20 100nF 16V C0681 2113743E20 100nF 16V D0101 4813825A05 CHIP SCHOTTKY D0151 4813833C02 DUAL SOT MMBD6100 D0179 4813833C02 DUAL SOT MMBD6100 D0301 Used in 4802245J47 GM1280 only SCHOTTKY BARRIER (RB471E) D0621 4813833C02 DUAL SOT MMBD6100 D0651 4813833C02 DUAL SOT MMBD6100 D0660 4813833C02 DUAL SOT MMBD6100 D0661 4813833C02 DUAL SOT MMBD6100 E0271 2484657R01 Ferrite Bead E0272 2484657R01 Ferrite Bead E0631 2484657R01 Ferrite Bead F0401 6580542Z01 3A 24V J0401 0902636Y02 CONN FLEX 12 PIN J0451 0902636Y01 CONN FLEX SIDE ENTRY J0501 0986105B01 CONN SMD 20 PIN J0551 0905505Y04 CONN ZIF HORIZONTAL J0552 0905505Y03 CONN ZIF 18PIN J0601 0986165B01 DC PWR CONN Q0110 4880048M01 NPN DIG 47k/47k Q0151 4880048M01 NPN DIG 47k/47k Q0171 4880048M01 NPN DIG 47k/47k Q0173 4880052M01 NPN DRLNGTN MXTA Q0177 4880048M01 NPN DIG 47k/47k Q0181 4880048M01 NPN DIG 47k/47k Q0183 4880048M01 NPN DIG 47k/47k Q0185 4880048M01 NPN DIG 47k/47k Q0271 4880214G02 NPN 40V .2A Q0641 4880048M01 NPN DIG 47k/47k Q0661 4805921T02 DUAL ROHM FMC2 RH Q0662 4880214G02 NPN 40V .2A Q0663 4880048M01 NPN DIG 47k/47k Q0681 4880052M01 NPN DRLNGTN MXTA R0101 0662057A73 10k 1/16W 5% R0102 0662057A65 4k7 1/16W 5% R0103 0662057A01 10 1/16W 5% R0104 0662057A73 10k 1/16W 5% R0105 Used in0662057A97 GM140/160100k 1/16W GM340/360/640/660 only R0106 Used in 0662057B47 0 1/16W GM380/GM1280 only R0108 0662057A57 2k2 1/16W 5% R0111 0662057B47 0 1/16W 0306 R0113 0662057A73 10k 1/16W 5% R0114 0662057A73 10k 1/16W 5% R0115 0662057A73 10k 1/16W 5% R0117 0662057A63 3k9 1/16W 5% Circuit RefMotorola Part NoDescription
Controller T12 / Schematic Diagrams3-49 * Motorola Depot Servicing only Reference designators with an asterisk indicate components which are not fieldreplaceable because they need to be calibrated with specialized factory equipment after installation. Radios in which these par ts have been replaced in the field will be off frequency at temperature extremes. R0121 0662057A97 100k 1/16WR0131 0662057B46 10.0 MEG OHMS 5% R0132 0662057B10 330k 1/16W 5% R0151 0662057A82 24K 1/16W 5% R0152 0662057A82 24K 1/16W 5% R0170 0662057A73 10k 1/16W 5% R0171 0662057A65 4k7 1/16W 5% R0172 0662057A73 10k 1/16W 5% R0173 0662057A65 4k7 1/16W 5% R0174 0662057A73 10k 1/16W 5% R0175 0662057A73 10k 1/16W 5% R0176 0662057A84 30k 1/16W 5% R0177 0662057A65 4k7 1/16W 5% R0178 0662057A89 47k 1/16W 5% R0179 0662057A89 47k 1/16W 5% R0181 0662057A65 4k7 1/16W 5% R0182 0662057A89 47k 1/16W 5% R0183 0662057A65 4k7 1/16W 5% R0184 0662057A89 47k 1/16W 5% R0185 0662057A65 4k7 1/16W 5% R0186 0662057A89 47k 1/16W 5% R0201 0662057A25 100 1/16W 5% R0202 0662057A43 560 1/16W 5% R0203 0662057A25 100 1/16W 5% R0204 0662057A43 560 1/16W 5% R0205 0662057A73 10k 1/16W 5% R0206 0662057A73 10k 1/16W 5% R0207 0662057A57 2k2 1/16W 5% R0208 0662057A57 2k2 1/16W 5% R0211 0660076E70 FILM 7500 R0212 0660076E70 FILM 7500 R0221 0662057A82 24K 1/16W 5% R0222 0662057A82 24K 1/16W 5% R0223 0662057A84 30k 1/16W 5% R0224 0662057A71 8k2 1/16W 5% R0228 0662057B47 0 1/16W R0229 0662057A01 10 1/16W 5% R0241 0662057A89 47k 1/16W 5% R0242 0662057B47 0 1/16W R0251 0662057A89 47k 1/16W 5% R0252 0662057A91 56K 1/16W 5% R0253 0662057A97 100k 1/16W R0254 0662057A73 10k 1/16W 5% R0255 0662057A73 10k 1/16W 5% R0256 0662057A97 100k 1/16W R0257 0662057A57 2k2 1/16W 5% R0261 0662057A73 10k 1/16W 5% R0262 0662057B08 270k 1/16W R0265 0662057A82 24K 1/16W 5% R0267 0662057A89 47k 1/16W 5% R0268 0662057A73 10k 1/16W 5% Circuit RefMotorola Part NoDescription R0269 0662057A41 470 1/16W 5% R0273 0662057A82 24K 1/16W 5% R0275 0662057A73 10k 1/16W 5% R0276 0662057A77 15k 1/16W 5% R0323 Used in 0662057A79 GM1280 only 18k 1/16W 5% R0324 Used in0662057A79 GM1280 only18k 1/16W 5% R0331 Used in 0662057A73 GM1280 only 10k 1/16W 5% R0332 Used in0662057A73 GM1280 only10k 1/16W 5% R0333 Used in 0662057A73 GM1280 only 10k 1/16W 5% R0335 Used in0662057B02 GM1280 only150k 1/16W R0341 Used in 0662057A73 GM1280 only 10k 1/16W R0342 Used in0662057A55 GM1280 only1k8 1/16W R0343 Used in 0662057B47 GM1280 only 0 1/16W R0344 Used in0662057A91 GM1280 only56K 1/16W R0345 Used in 0662057A66 GM1280 only 5k1 1/16W R0346 Used in0662057A89 GM1280 only47k 1/16W R0347 Used in 0662057A89 GM1280 only 47k 1/16W R0401 0662057A33 220 1/16W R0407 0662057M26 10 5% 20X40 R0408 0662057A25 100 1/16W 5% R0409 0662057M26 10 5% 20X40 R0412 0662057B47 0 1/16W R0441 0662057B47 0 1/16W R0442 0662057A49 1k 1/16W 5% R0467 0662057M26 10 5% 20X40 R0468 0662057A97 100k 1/16W R0481 0662057B47 0 1/16W R0482 0662057B47 0 1/16W R0508 0662057A41 470 1/16W 5% R0509 0662057B47 0 1/16W R0510 0662057A65 4k7 1/16W 5% R0511 0662057A97 100k 1/16W R0512 0662057A77 15k 1/16W 5% R0525 0662057A97 100k 1/16W R0529 0662057A89 47k 1/16W 5% R0530 0662057A81 22k 1/16W 5% R0531 0662057A43 560 1/16W 5% R0533 0662057B47 0 1/16W R0535 0662057A49 1k 1/16W 5% Circuit RefMotorola Part NoDescription R0537 0662057A33 220 1/16W 5%R0538 0662057A33 220 1/16W 5% R0539 0662057A65 4k7 1/16W 5% R0541 0662057A83 27k 1/16W 5% R0543 0662057A97 100k 1/16W R0555 0662057A25 100 1/16W 5% R0556 0662057A25 100 1/16W 5% R0591 0662057A82 24K 1/16W 5% R0592 0662057A01 10 1/16W 5% R0593 0662057A97 100k 1/16W R0611 0662057A91 56K 1/16W R0612 0662057A65 4k7 1/16W R0621 0662057A82 24K 1/16W R0641 0662057A73 10k 1/16W R0642 0660076E70 FILM 7500 R0643 0660076E51 FILM 1200 R0651 0662057A01 10 1/16W 5% R0652 0662057A01 10 1/16W 5% R0661 0662057A49 1k 1/16W 5% R0662 0662057B02 150k 1/16W R0671 0662057A84 30k 1/16W 5% R0672 0662057A73 10k 1/16W 5% R0681 0662057A79 18k 1/16W 5% R0682 0662057A93 68k 1/16W 5% U0101 5102226J56 MICRO PROCESSOR MC68HC1 1FLO * U0111 5102463J64 EEPROM X25128-2.7 SO8 * U0121 5186137B01 512KX8 FLASH ROM (AT49BV020) U0122 5185748L01 32K x 8 SRAM U0141 5113805A30 10F8 DCDR/REMUX 74HC138 U0211 5183222M49 QUAD OPAMP __3403 U0221 5185130C53 ASFICCMP 0.5MM TQFP U0251 5184704M60 MUX/DEMUX,TRIPLE 2- U0271 5109699X01 AUDIO PA TDA1519C U0301 Used in 5109152M01 GM1280 only EEPROM ANALOG ISD33120EI U0331 Used in5186204B01 GM1280 only BUFFER/DRIVER 74AHCT1G125 U0341 Used in 5180932W01 GM1280 only LINEAR IC OP AMP U0342 Used in5105750U28 GM1280 only SNGL ANALOG SWITCH SMD U0351 Used in 5102463J40 GM1280 only REGULATOR, 3.3V, LP2951CM-3.3 U0611 5183308X01 ADJ VLTG REG LM2941 TO 26 3 U0641 5183308X01 ADJ VLTG REG LM2941 TO 26 3 U0651 5113816A07 REG 5V POS 500MA MC78M05 Circuit RefMotorola Part NoDescription U0652 5113815A02 MC33064 VR0151 4813830A15 5.6V 5% 225mW VR0501 4805656W09 ZENER QUAD MMQA20VT1 VR0503 4805656W09 ZENER QUAD MMQA20VT1 VR0504 4813830A40 SOC23 AUTO SDN VR0505 4805656W09 ZENER QUAD MMQA20VT1 VR0509 4813830A40 SOC23 AUTO SDN VR0510 4813830A40 SOC23 AUTO SDN VR0537 4813830A15 5.6V 5% 225mW VR0541 4813830A27 14V 5% 225MW VR0601 4813832C77 TRANS SUP. 24V HIGH POWER VR0621 4813830A15 5.6V 5% 225mW Y0131 4880113R19 CRYSTAL 38.4KHz Circuit RefMotorola Part NoDescription
Professional Radio GM Series Controller Service Information Issue: August 2002
ii Computer Software Copyrights The Motorola products described in this manual may include copyrighted Motorola computer programs stored in semiconductor memories or other media. Laws in the United States and other countries preserve for Motorola certain exclusive rights for copyrighted computer programs, including the exclusive right to copy or reproduce in any form, the copyrighted computer program. Accordingly, any copyrighted Motorola computer programs contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola products shall not be deemed to grant, either directly or by implication, estoppel or otherwise, any license under the copyrights, patents or patent applications of Motorola, except for the normal non-exclusive royalty- free license to use that arises by operation of law in the sale of a product.
iii Table of Contents Chapter 1 THEORY OF OPERATION 1.0 Controller Circuits ................................................................................................ 1-1 1.1 Overview......................................................................................................... 1-1 1.2 General ........................................................................................................... 1-1 1.3 Radio Power Distribution ................................................................................ 1-2 1.4 Electronic ON/OFF ......................................................................................... 1-3 1.5 Emergency ..................................................................................................... 1-4 1.6 Mechanical ON/OFF ....................................................................................... 1-4 1.7 Ignition ............................................................................................................ 1-5 1.8 Microprocessor Clock Synthesizer ................................................................. 1-5 1.9 Serial Peripheral Interface (SPI) ..................................................................... 1-5 1.10 SBEP Serial Interface ..................................................................................... 1-6 1.11 General Purpose Input/Output....................................................................... 1-6 1.12 Normal Microprocessor Operation.................................................................. 1-7 1.13 FLASH Electronically Erasable Programmable Memory ................................ 1-8 1.14 Electrically Erasable Programmable Memory (EEPROM) .............................. 1-9 1.15 Static Random Access Memory (SRAM) ....................................................... 1-9 1.16 Universal Asynchronous Receiver Transmitter (UART) ................................. 1-9 2.0 Controller Board Audio and Signalling Circuits .................................................... 1-9 2.1 General - Audio Signalling Filter IC with Compander ..................................... 1-9 2.2 Transmit Audio Circuits ................................................................................ 1-10 2.3 Transmit Signalling Circuits .......................................................................... 1-12 2.4 Receive Audio Circuits ................................................................................. 1-14 2.5 Receive Signalling Circuits ........................................................................... 1-17 2.6 Voice Storage ............................................................................................... 1-18
iv Chapter 2 TROUBLESHOOTING CHARTS 1.0 Controller ............................................................................................................ 2-1 Chapter 3 CONTROLLER SCHEMATICS 1.0 Allocation of Schematics and Circuit Boards ....................................................... 3-1 2.0 T2 Controller ....................................................................................................... 3-3 3.0 T5 Controller ..................................................................................................... 3-10 4.0 T6/7 Controller .................................................................................................. 3-19 5.0 T9 Controller ..................................................................................................... 3-29 6.0 T11 Controller ................................................................................................... 3-35 7.0 T12 Controller ................................................................................................... 3-42
Chapter 1 THEORY OF OPERATION 1.0 Controller Circuits 1.1 Overview This section provides a detailed theory of operation for the radio and its components. The main radio is a single board design, consisting of the transmitter, receiver, and controller circuits. The main board is designed to accept one additional option board. This may provide functions such as secure voice/data, voice storage or signalling decoder. A controlhead is either mounted directly or connected by an extension cable. The controlhead contains, LED indicators, a microphone connector, buttons and dependant of the radio type, a display and a speaker. These provide the user with interface control over the various features of the radio. If no controlhead is mounted directly on the front of the radio, an expansion board containing circuitry for special applications can be mounted on the front of the radio. An additional controlhead can be connected by an extension cable. In addition to the power cable and antenna cable, an accessory cable can be attached to a connector on the rear of the radio. The accessory cable provides the necessary connections for items such as external speaker, emergency switch, foot operated PTT, and ignition sensing, etc 1.2 General The radio controller consists of 3 main subsections: n nDigital Control n nAudio Processing n nVoltage Regulation. The digital control section of the radio is based upon an open architecture controller configuration.It consists of a microprocessor, support memory, support logic, signal MUX ICs, the On/Off circuit, and general purpose Input/Output circuitry. The controller uses the Motorola 68HC11FL0 microprocessor (U0101). In addition to the microprocessor, the controller has 3 external memory devices. The 3 memory devices consist of a 32Kbyte SRAM (U0122), a 512Kbyte FLASH EEPROM (U0121), and a 16Kbyte EEPROM (U0111). Note: From this point on the 68HC11FL0 microprocessor will be referred to as µP. References to a controlhead will be to the controlheads with display.
1-2THEORY OF OPERATION
Figure 1-1 Controller Block Diagram
1.3 Radio Power Distribution
The DC power distribution throughout the radio board is shown in Figure 2-1. Voltage regulation for
the controller is provided by 4 separate devices; U0651 (MC78M05) +5V, U0641 (LM2941) +9.3V,
U0611 (LM2941) SWB+ limited to 16.5V and VSTBY 5V (a combination of R0621 and VR0621). An
additional 5V regulator is located on the RF section.
The DC voltage applied to connector J0601 supplies power directly to the electronic on/off control,
RF power amplifier, 16.5V limiter, 9.3V regulator, Audio PA and 5.6V stabilization circuit. The 9.3V
regulator (U0641) supplies power to the 5V regulator (U0651) and the 6V voltage divider Q0681.
Regulator U0641 is used to generate the 9.3 volts required by some audio circuits, the RF circuitry
and power control circuitry. Input and output capacitors (C0641 and C0644 / C0645) are used to
reduce high frequency noise. R0642 / R0643 set the output voltage of the regulator. If the voltage at
pin 1 is greater than 1.3 volts the regulator output decreases and if the voltage is less than 1.3 volts
the regulator output increases. This regulator output is electronically enabled by a 0 volt signal on pin
2. Q0661, Q0641 and R0641 are used to disable the regulator when the radio is turned off.
Voltage regulation providing 5V for the digital circuitry is done by U0651. Operating voltage is from
the regulated 9.3V supply. Input and output capacitors (C0651 / C0652 and C0654 / C0655) are
used to reduce high frequency noise and provide proper operation during battery transients. Voltage
sense device U0652 or alternatively U0653 provides a reset output that goes to 0 volts if the
regulator output goes below 4.5 volts. This is used to reset the controller to prevent improper
operation. Diode D0651 prevents discharge of C0652 by negative spikes on the 9V3 voltage.
Transistor Q0681 and resistors R0681 / R0682 divide the regulated 9.3V down to about 6 volts. This
voltage supplies the 5V regulator, located on the RF section. By reducing the supply voltage of the
regulator, the power dissipation is divided between the RF section and the controller section.
External
Microphone
Internal
Microphone
External
Speaker
Internal
Speaker
SCI to
Controlhead Audio
PA Audio/Signalling
Architecture To Synthesizer
Mod
Out
16.8 MHz
Reference Clock
from Synthesizer
Recovered Audio
To RF SectionSPI
Digital
ArchitectureµP Clock
5V
Regulator
(5VD)RAM
EEPROM
FLASHHC11FL0 ASFIC_CMP
Accessory & 5V
from Synthesizer
Section (5V_RF)
Connector