Semiconductor Data - Kenwood 144MHz FM TRANSCEIVER K2E Service Manual

TH-K2AT/K2E/K2ET
MPU : 90522BPFFG139 (IC8)
Pin function
Pin Pin
I/O
No. Name
1 CLOCK O Common serial clock output
2 DATA O Common serial data output
3 EEPDI I Data input from EEPROM
4 EEPCS O Chip select output to EEPROM
5 VOX O VOX power supply switch
BPF tuning voltage output, APC voltage
6 BPF/APC O
output (PWM)
7 KAPC O APC ON/OFF switch
8 VCC - Positive power supply
9 AFM O AF mute switch
10 SPM O Speaker mute switch
11 RXD I UART data input line from PC (9600bps)
12 TXD O UART data output line to PC (9600bps)
13 PTTE I External [PTT] key input
14 PTTI I [PTT] key input
15 5C(SAVE) O Save power supply switch
Gate bias control of TX final amplifier
16 FINAL O
17 SEG0 O LCD segment output 0
18 SEG1 O LCD segment output 1
19 SEG2 O LCD segment output 2
20 SEG3 O LCD segment output 3
21 SEG4 O LCD segment output 4
22 SEG5 O LCD segment output 5
23 SEG6 O LCD segment output 6
24 SEG7 O LCD segment output 7
25 SEG8 O LCD segment output 8
26 SEG9 O LCD segment output 9
27 SEG10 O LCD segment output 10
28 SEG11 O LCD segment output 11
29 SEG12 O LCD segment output 12
30 SEG13 O LCD segment output 13
31 SEG14 O LCD segment output 14
32 SEG15 O LCD segment output 15
33 VSS - GND
- Power supply stabilization (Connected to
34 COR1
VSS through 0.1uF)
35 ENCA I Encoder A side input
36 ENCB I Encoder B side input
37 5MS O 5MS main power supply switch
38 DVCC - Reference voltage input for DAC
39 DVSS - Ground for DAC
DTMF/ Encode waveform output of DTME/BEEP/
40 O
BEEP 1750Hz (D/A)
Encode waveform output of CTCSS/DCS
41 TONE O
(D/A)
42 AVCC - Positive power supply for ADC
43 AVRH - Reference voltage input for ADC
44 AVRL - Ground reference voltage input for ADC
45 AVSS - Ground for ADC
Remote control microphone key voltage
46 REM I
input (A/D)
Decode waveform input of CTCSS/DCS
47 SIGIN I
(A/D)
14

SEMICONDUCTOR DATA

Function
L:ON
L:APC ON
L:Mute
H:Mute
L:ON
L:ON
L:ON
L:Bias ON
L:ON
Pin Pin
I/O
No. Name
48 SQ I Noise voltage input for squelch (A/D)
49 SM I RSSI voltage input for S-meter (A/D)
50 VOXIN I Microphone voltage input for VOX (A/D)
51 THERM I TX temperature compensation input(A/D)
52 BATT I Battery voltage input (A/D)
Detection of thermistor voltage (temperature)
53 BTEMP I
in the Ni-MH battety (A/D)
54 VCC - Positive power supply
Battery charge circuit power supply switch
55 CHARGE O
56 LAMP O Lamp power supply switch
AF amplifier/Lamp AVR power supply
57 AFAMP O
switch
58 NAR O Wide/Narrow switching
59 COM0 O LCD common output 0
60 COM1 O LCD common output 1
61 COM2 O LCD common output 2
62 COM3 O LCD common output 3
63 VSS - GND
64 SEG16 O LCD segment output 16
65 SEG17 O LCD segment output 17
66 SEG18 O LCD segment output 18
67 SEG19 O LCD segment output 19
68 SEG20 O LCD segment output 20
69 SEG21 O LCD segment output 21
70 SEG22 O LCD segment output 22
71 SEG23 O LCD segment output 23
72 SEG24 O LCD segment output 24
73 NC - Not used
74 NC - Not used
75 SEG25 O LCD segment output 25
76 SEG26 O LCD segment output 26
77 SEG27 O LCD segment output 27
78 SEG28 O LCD segment output 28
79 SEG29 O LCD segment output 29
80 SEG30 O LCD segment output 30
81 SEG31 O LCD segment output 31
82 V0 - Not used
83 V1 - Not used
84 V2 - Not used
85 V3 - LCD drive power supply 3
86 HST(VCC) I Not used (VCC)
87 MD2 I L fixed
88 MD1 I H fixed
89 MD0 I H fixed
90 RESET I Reset input
91 VSS - GND
92 X0 I System clock (7.9872MHz)
93 X1 O System clock (7.9872MHz)
94 VCC - Positive power supply
95 PWRSW I Power switch interrupt input ( ↓ )
96 INTUP I Power supply voltage interrupt input ( ↑ )
97 INTDW I Power supply voltage interrupt input ( ↓ )
Function
H:ON
H:ON
H:ON
H:Narrow
L:Reset