Power Supply Circuits; Cpu Port Allocations - Icom IC-A22 Service Manual

3-4 POWER SUPPLY CIRCUITS

LINE DESCRIPTION
Voltage line from the attached battery pack or the
HV
[DC 12V] jack.
The same voltage as the HV line which is controlled
VCC
by [POWER] switch (R5052).
Common 5 V converted from the VCC line by the
5V 5V regulator circuit (Q5014, Q5015, D5005) using
the reference regulator (IC5006) on the MAIN unit.
Common 5 V converted from the VCC line by the
+5 +5 regulator circuit (Q5016, Q5017, D5006) using
5V line as the reference voltage.
5 V for receiver circuit converted from the VCC line
by the R5 regulator circuit (Q5018, Q5019, Q5020,
R5 D5007).
R5 is controlled by Q5018 using TRC signal from
the CPU(IC6001).
5 V for transmitter circuit controlled by the TMUT
signal from the CPU (IC6001). T+5 regulator circuit
T+5
is located on the RF unit and consists of Q4012,
Q4013 and D4016.

3-5 CPU PORT ALLOCATIONS

PIN PORT
NO. NAME
Input port for detecting the connected
2 LBATT battery (or external DC input) voltage for
"LOW BATT" or "OVER V" indication.
Input port for the squelch condition.
3 SQL
When squelch open: Low
Input port for the PLL condition.
4 LOK
When PLL in unlocked: High
Outputs a clock signal to the PLL IC
14 CLK
(IC4001).
15 DATA Outputs N-data to the PLL IC.
16 ENB Outputs a strobe signal to the PLL IC.
Outputs a clock signal to the EEPROM
17 SCL
(IC6002).
18 SDA Outputs data to the EEPROM.
19 UP Input port for the tuning dial "UP" clock.
20 DOWN Input port for the tuning dial "DOWN" clock.
Outputs a backlit control signal for the
21 LIGHT
LCD and keypad. High: for lighting
22 BEEP Outputs beep signals.
23 CLONE Outputs clone data.
Input port for the PTT switch.
24 PTT
When PTT is pushed: High
25 CLONE Input port for the clone reading.
26 BACK UP Input port for the CPU backup signal.
27 VORS* Input port for the VOR reference signal.
28 VORC* Input port for the VOR variable signal.
29 VORO* Input port for the VOR level signal.
DESCRIPTION
PIN PORT
NO. NAME
30–
R10–R13 Output ports for the key matrix.
33
34–
R20–R30 Input port for the key matrix.
37
38–
R31–R33 Input port for the initial matrix.
41
Outputs the WX control signal.
42 WX
High: when a WX channel is selected.
Outputs the navigation channel signal.
43 NAV*
High: when a NAV channel is selected.
Outputs the ANL signal.
44 ANL
High: to activate the ANL function
Outputs the AF power amplifier control
46 AFON signal.
High: to activate the amplifi er
Outputs a Tx/Rx control signal.
47 TRC
High: for Tx
48 TMUT Outputs a Tx mute signal. Low: for muting
Outputs a "shift" signal for VCO oscillating
49 SHIFT
frequency.
Note: * for IC-A22/E only
3 - 4
DESCRIPTION