Icom ID-51A Service Manual - Page 17

4-4 PORT ALLOCATIONS • CPU (LOGIC UNIT: IC5) Pin No. Line Name Description I/O Pin No. Line Name Description I/O A10 DICK1 [DIAL] (outer dial) (S12) phase-A I A11 AUNLK PLL unlock detection. (Band A) L=Unlocked. I C5 VOX VOX sensing voltage. I C7 ACTCIN TSQL/DTCS tone signal. (Band A) I A12 DALD D/A converter serial strobe. O A13 KS0 Key matrix strobe. O A14 KS2 A4 BLV Lock voltage. (Band B) I A5 REMOTE* Key inputs from the external microphone. I A6 VIN External power supply voltage. I A7 ATONE WX alert signal (1050 Hz). (Band A) I A8 TTEMP TX power AMP temperature sensing voltage. I A9 AUDI Response signal from the audio IC. I B1 DTMF DTMF tone, european tone and beep sound signals. O B10 DIUD1 [DIAL] (outer dial) (S12) phase-B I B11 CLSFT1** CPU clock frequency shift control. O B13 KS1 Key matrix strobe. O B15 KR0 Key matrix return. I C9 CLSFT2** Clock frequency shift control. O Common serial clock to the PLL, D1 DATA D/A converter, expander and au- O dio IC. D10 DICK2 [DIAL] (inner dial) (S12) phase-A. I Common serial clock to the PLL, D11 CK D/A converter, expander and au- O dio IC. D12 KR2 Key matrix return. I Battery type detection. D13 BTDET L=An appropriate battery pack is I attached. D14 PWRSW [POWER] key input. L=Pushed. I D15 SCLK_R Radio IC serial clock. O D2 G_RXD UART data from the internal GPS module. I D4 BTONE WX alert signal (1050Hz). (Band B) I D5 BTSENC Battery type detection. I B4 BRSSI RSSI voltage. (Band B) I D6 BTVIN Battery voltage. I B5 ALV Lock voltage. (Band A) I B7 TXI-V Transmit current sensing voltage. I B8 TEMP Charging circuit temperature sensing voltage. I B9 AURES Audio IC reset. L=Reset. O C10 DIUD2 [DIAL] (inner dial) (S12) phase-B. I TSQL/DTCS filter switching con- C11 DTCS trol. O H=While the DTCS tone is used. C13 KS3 Key matrix strobe. O C14 KR1 Key matrix return. I D7 ARSSI RSSI voltage. (Band A) I D8 AUSTB Audio IC serial strobe. O D9 SEN_R Radio IC serial strobe. O E13 RES_R Radio IC reset. L=Reset. O E14 SDIO_R Radio IC serial data. I/O E4 G_TXD UART data to the internal GPS module. O F12 CHGC Charging circuit control. H=While charging. O F13 TXLED TX LED control. H=Lights. O External power supply connection C15 DCIN detect. L=An external power supply is I connected. C2 CTCSS CTCSS/DTCS tone signal. O RX AF mute control. F14 FMMUTE H=While receiving in the FM/FM-N O mode. F15 BLED Busy LED control. H=Lights. O C4 BCTCIN TSQL/DTCS tone signal. (Band B) I G12 INTMIC MIC line switching control. H=While the internal MIC is used. O *; Key input sensing voltage. Pushed key None of key is pushed. VOX headset [] [] A key B key Voltage range 2.698-3.300 V 2.216-2.468 V 1.708-2.213 V 1.283-1.705 V 0.932-1.280 V 0.637-0.928 V G14 CHGH Charging current control. H=While charging using. O G15 PCON Main power supply line control. H=Power ON. O LCD backlit and key backlit con- G3 LIGHT trol. O H=Light. LCD backlit and key backlit bright- G4 DIM ness control. O H=Bright. Key locked. 0.000-0.634 V **; Clock frequency shifting range. Line name CLSFT1 CLSFT2 H H Shifting range -1.2 kHz H12 G_WKUP GPS module wake-up control. H=Power ON. I Receive circuit power control. J1 BR3C (Band B) O H=While receiving on band B. Line state H L L ±
0 kHz L ± 1.2 kHz J12 MMUTE MIC mute control. H=Mute. O 4 - 8