Cpu Port Allocation; Voltage Block Diagram - Icom IC-T70A Service Manual

4-4 CPU PORT ALLOCATION

Pin LINE
DESCRIPTION
No. NAME
[POWER ] input.
1 PWRSW
L=Pushed.
2–5 KS3–KS0
Key matrix.
6–9 KR3–KR0
CPU clock frequency shift.
12 CSHIFT
H=Clock frequency is shifted.
Main power supply line "VCC" control.
15 PCON
H=The transceiver's power is ON.
LED backlight control.
16 LIGHT
L=The backlight is ON.
Charger circuit control.
17 CHGC
H=While charging.
18 VOLCK D/A converter serial clock.
19 VOLDA D/A converter serial data.
PLL unlock detection.
27 UNLOCK
H=The PLL is unlocked.
External [PTT] input.
28 EXTPTT
H=Pushed.
Internal [PTT] input.
37 INTPTT
L=Pushed.
38 ESIO EEPROM serial data.
39 ECK EEPROM serial clock.
40 PLLDATA PLL IC serial data.
41 PLLCK PLL IC serial clock.
42 PLLSTB PLL IC strobe.
PLL IC power saving mode control.
43 PPS
H=Power saving mode.
44 DACLK D/A converter serial clock.
45 DADI D/A converter serial data.
46 DALD D/A converter strobe.
RX power supply line "R5" control.
47 R5C
L=During receive.
TX power supply line "T5" control.
48 T5C
H=During transmit.
49 IOSTB Expander strobe.
Expander chip enable.
50 IOEN
H=Output enable.
Power supply line "PS5" control.
51 PS5C L= The transceiver's power is ON and
in the power saving mode.
MIC line switch (Q7) control.
52 INTMIC
H=Internal MIC is used.
PLL IC loop fi lter switching.
53 PLL SW
L= The PLL lockup time is set to short.

4-5 VOLTAGE BLOCK DIAGRAM

Voltage from the power supply is routed throughout the transceiver via regulators and switches.
VVCO5 UVCO5
PS5
PLL3.6V
UR5
Q300 Q317
VCO5V
UR5
REG CTRL
Q201
Q302
IC304
+3.6 RIPPLE +5
REG
FILTER REG
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I/O
I
O
I
O
O
O
O
O
O
I
I
I
I/O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
VR5 R5
Q316
VR5
CTRL
T5 BTL5V
Q202 Q200
Q5,Q6
R5 T5 +5
REG REG REG
4 - 4
Pin LINE
No. NAME
RX AF line switch (IC904) control.
54 DETMUTE
L=AF mute (The quelch is closed).
Transmission mute.
56 TXMUTE
L=TX mute.
MIC mute switch (IC909) control.
57 MMUTE L= While DTMF or 1750 Hz tone is
transmitted.
Noise fi lter select.
58 SQLSW
L= The narrow FM mode is selected.
98 CTCSS Outputs CTCSS/DTCS signals.
• During transmit, outputs DTMF/
1750 Hz tone signals.
99 DTMF
• During receive, outputs beep sounds
(Square waves)
104 VOX Microphone input sensing voltage.
105 BTVIN Battery voltage.
106 VIN External power source voltage.
107 BTSENC Battery type detection.
Temperature sensing voltage. (For
108 RXTEMP
Receiving)
Temperature sensing voltage. (For
109 TXTEMP
Transmitting)
E x t e r n a l e q u i p m e n t c o n n e c t i o n
110 REMOTE
detection.
111 RTONE* Weather alert signal decoding input.
Tone signals (CTCSS, DTCS, DTMF
112 CTCIN
and 1750 Hz tone) decoding input.
RSSI voltage from the IF demodulator
113 SD
IC (IC313).
114 TXI-V TX current sensing voltage.
AF power AMP control.
115 AFSTBY
H=AF power AMP (IC1) is activated.
116 DIUD2 [DIAL] input. (phase A)
117 NOISE Noise level detection.
118 DICK2 [DIAL] input. (phase B)
Battery pack attachment detection.
119 BTDET L= The battery pack (BP-264, BP-265)
is attached.
External power source connectinon
120 DCIN detection.
L= An external power source is connected.
121 DIUD [VOL] input. (phase A)
122 DICK [VOL] input. (phase B)
125 KS4 Key matrix.
*; Only for the U.S.A. version transceiver.
Q101,Q102
D102,D105
CHG
CTRL
CHGC
BTSENC
5VS CPU5V
Q101
D108
+5 +5
Q108-Q110
D106 REG REG
BTDET
VCC
DESCRIPTION I/O
O
O
O
O
O
O
O
O
Q100
D100,D101
J100
HV
DC
[DC IN]
VCC SW
CHG
+
BTSENC
BATT
Battery pack
DET
-
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I