TH-K4AT/K4E
15
98
DCDET
I
DC IN detection interrupt input (
↓
)
L:DC IN connected
99
RXLED
O
Busy LED output
H:ON
100
BSFT
O
Beat shift swiching output
H:ON
101
PLLEN
O
Serial enable output to PLL IC
102
PLLLD
I
Lock detection input from PLL IC H: Lock
103
KIN0
I
Key matrix input 0
104
KIN1
I
Key matrix input 1
105
KIN2
I
Key matrix input 2
106
KIN3
I
Key matrix input 3
107
KIN4
I
Key matrix input 4
108
TYPE
I
Market code bit input
109
VUKEY
I
Detection of VHF or UHF, 4 key or 16 key
110
MICM
O
Microphone mute switch
H:Mute
111
NOAA
I
Not used
112
5R
O
RX power supply switch
L:ON
113
SHIFT
O
VCO shift switch
L:RX, H:TX
114
5T
O
TX power supply switch
L:ON
115
KOUT0
O
Key matrix output 0
116
KOUT1
O
Key matrix output 1
117
KOUT2
O
Key matrix output 2
118
KOUT3
O
Key matrix output 3
119
VSS
-
GND
120
BTDET
O
Battery detection switch
L:ON
SEMICONDUCTOR DATA / COMPONENTS DESCRIPTION
Pin
Pin
I/O
Function
No.
Name
IC1
PLL IC
IC2
APC differential
amplifier
IC3
FM IC
IC4
11.5V AVR
IC5
HPF
Active filter
IC6
AF amplifier
IC8
MPU
IC9
5.0V AVR
IC10
4.4V voltage
MPU INT voltage detection
detection
IC11
3.3V voltage
MPU Reset voltage detection
detection
IC12
5.0V AVR
IC15
EE PROM
IC16
MIC amplifier Limiter, splatter filter
IC17
CTCSS/DCS
Active filter
filter
Q1
VCO
Q2
RF amplifier
Q3
VCO shift
On TX
control switch
Q4
Ripple filter
Q5,6,9
RF amplifier
Q10,11
Drive amplifier
Q12
Power amplifier
Q13
APC circuit
On TX
operation switch
Q14
APC output
On TX
switch
Q15
Q10 operation
On TX
switch
Q16
1st mixer
Q17
RX 1st amplifier
Q20
Audio mute
Audio mute when off
switch
Q21
Audio filter
Active filter
Q22
Wide/narrow
On when wide is selected
switching
Q23
Tripler
2nd local
Q24
IF amplifier
1st IF 38.85MHz
Q27
Wide/narrow
On when wide is selected
switching
Q29
MIC mute
Mutes when ON
switch
Q30
VOX detection
amplifier
Q31
Q56 operation
Off when the speaker outputs audio
switch
Q33
Charge switch
Ref. No.
Use/Function
Operation/Condition/Compatibility
TX-RX UNIT (X57-675X-XX)
COMPONENTS DESCRIPTION
