Power Supply Circuits; Port Allocations; Output Expander; Voltage Lines - Icom IC F110S Service Manual

4-4 POWER SUPPLY CIRCUITS

4-4-1 VOLTAGE LINES (MAIN UNIT)
Line
The voltage from a DC power supply.
HV
The same voltage as the HV line which is con-
trolled by the power switching circuit (Q23, Q24).
When the [POWER] switch is pushed, the CPU
VCC
outputs the "PWON" control signal to the power
switching circuit to turn the circuit ON.
Common 5 V for the CPU converted from the HV
line by the CPU5V regulator circuit (IC10). The
CPU5V
circuit outputs the voltage regardless of the
power ON/OFF condition.
Common 8 V converted from the VCC line by the
8V
8V regulator circuit (IC9).
Common 5 V converted from the VCC line by the
5V
5V regulator circuit (Q27, Q28).
Receive 8 V controlled by the R8 regulator circuit
R8V (Q26, Q30) using the "RXC" signal from the CPU
(FRONT unit; IC1, pin 18).
Transmit 8 V controlled by the T8 regulator circuit
(Q25, Q29, D23) using the "TMUT" signal from
T8V
the CPU (FRONT unit; IC1, pin 40).

4-5 PORT ALLOCATIONS

4-5-1 LED DRIVER (FRONT UNIT; IC4)
Pin Port
number name
5–11 CH1–CH4 Output LEDs control signals.
LP0–LP2 Low : While LEDs are ON.
14 RLED Outputs BUSY LED control signal.
15 TLED Outputs TX LED control signal.
16 LIGT1 Outputs LED bright control signal.
17 LIGT2 Outputs backlight control signal.
Outputs external device control signal.
18 HORN High : When matched 5/2 tone signals
4-5-2 OUTPUT EXPANDER (MAIN UNIT; IC6)
Pin Port
number name
Outputs squelch control signal.
2 VOUT1
3 VOUT2 Outputs deviation (Tone) control signal.
10 VOUT3 Outputs deviation control signal.
Outputs DTCS control signal.
11 VOUT4
14 VOUT5 Outputs RX BPF control signal.
15 VOUT6 Outputs AGC control signal.
22 VOUT7 Outputs TX RF power control signal.
23 VOUT8 Outputs PLL reference control signal.
Description
Description
are received.
Description
4-5-3 CPU (FRONT UNIT; IC1)
Pin Port
number name
1 TEMP
2 BATV
7 RES
SENC0,
13, 14
SENC1
15 CSFT
16 DUSE
17 UNLK
18 RXC
SENC0,
19, 20
SENC1
21, 22 P0, P1
CENO0–
23–25
CENO2
26, 27 P2, P3
SCK
28
29 SO
BEEP
30
31 ESDA
ESCL
32
33 MMUT
RMUT
34
PLST
36
37
DAST
38 EXST
39 EXOE
40 TMUT
4 - 4
Description
Input port for the internal temperature.
Input port for low voltage detection
from the connected power supply.
Input port for the reset signal.
Output ports for 5/2 tone and DTMF
signals.
Outputs the CPU clock shift signal.
Outputs the cut-off frequency control
signal to the low-pass filter (MAIN; unit
IC5) for CTCSS/DTCS switching.
Input port for the PLL unlock signal
from the PLL IC (MAIN unit; IC4).
Outputs the R8V regulator circuit
(MAIN unit; Q26, Q30) control signal.
Output ports for 5/2 tone and DTMF
signals.
Input ports for key matrix.
Output ports for CTCSS/DTCS signals.
Input ports for key matrix.
Outputs clock signal to the PLL IC
(MAIN unit; IC4), D/A converter (MAIN
unit IC6), LED driver (FRONT unit; IC4)
and optional board (connect to MAIN
unit; J1).
Outputs data signal to the PLL IC
(MAIN unit; IC4), D/A converter (MAIN
unit; IC6), LED driver (FRONT unit;
IC4) and optional board (connect to
MAIN unit; J1).
Output port for beep sound signal.
I/O port for the data signal for the EEP-
ROM (FRONT unit; IC3).
Outputs clock signal for EEPROM
(FRONT unit; IC3).
Input port for the MIC mute signal from
the optional board via MAIN unit, J1.
Input port for the AF mute signal from
the optional board via MAIN unit, J1.
Outputs strobe signal for PLL IC (MAIN
unit; IC4).
Outputs strobe signal for the D/A con-
verter IC (MAIN unit; IC6).
Outputs strobe signal for LED driver IC
(FRONT unit; IC4).
Outputs control signal for the LED dri-
ver IC (FRONT unit; IC4).
Outputs the T8V regulator circuit
(MAIN unit; Q25, Q29, D23) control
signal.