TKR-740
64
TERMINAL FUNCTION
CONTROL UNIT (X53-3882-71)
1
RA
RX Audio (filtered signal)
I
2
RXG
RX Audio ground
-
3
DET
Detector audio
I
4
DEG
Detector audio ground
-
5
SC
Noise squelch control
I
6
RSSI
RX signal strength indicator
I
7
CK
Common clock
O
8
DT
Common data
O
9
ESR
Shift register strobe
O
10
EVR
Electronic volume strobe
O
11
SCL
RX EEPROM serial clock
O
12
SDA
RX EEPROM serial data
I/O
13
DP
PLL data signal
O
14
CP
PLL clock signal
O
15
EPR
RX main PLL strobe signal
O
16
LDR
RX PLL lock detector
I
17
GND
Ground
-
18
CVR
RX main PLL lock voltage
I
19
NC
No connection
-
20
NC
No connection
-
21
B
Pow er supply (Vcc)
O
22
B
Pow er supply (Vcc)
O
23
B
Pow er supply (Vcc)
O
24
NC
No connection
-
25
NC
No connection
-
26
NC
No connection
1
M OD
M odulation signal
O
2
TO
Signalling signal
O
3
M IG
M icrophone ground
-
4
EVT
TX electronic volume enable signal
O
5
EST
TX shift register enable signal
O
6
DT
Data signal for IC3 & IC4
O
7
CK
Clock signal for IC3 & IC4
O
8
NC
No connection
-
9
NC
No connection
-
10
SDA
RX EEPROM serial data
O
11
SCL
RX EEPROM serial clock
I/O
12
LDT
TX main PLL lock detector
I
13
PRT
High temperature detect
I
14
CP
TX both PLL clock signal
O
15
NC
No connection
-
16
DP
TX both PLL data signal
O
17
EXR
Exit reference detector
I
18
CVT
TX main PLL lock voltage
I
19
REV
Reverse TX pow er detector
I
20
FWD
Forw ard TX pow er detector
I
21
GND
Ground
-
22
PAG
Digital pager signal
O
23
B
Pow er supply (Vcc)
I
24
B
Pow er supply (Vcc)
I
25
B
Pow er supply (Vcc)
I
26
PAB
Pow er supply for AF PA IC
I
Terminal
No.
Terminal
name
Terminal function
I/ O
CN1
Terminal
No.
Terminal
name
Terminal function
I/ O
CN2
Terminal
No.
Terminal
name
Terminal function
I/ O
CN3
1
SPI
Local speaker input
O
2
SPG
Local speaker ground
-
3
VLO
AF volume control output
I
4
VLI
AF volume control input
O
5
GND
Ground
-
6
BLT
M ic connector J700 (1pin)
I
7
8C
8V constant voltage
O
8
HOK
Hook-sw itch
I
9
PTT
Press-to-talk-sw itch
I
10
EXR
Exit reference indicator
O
11
SW1
Programable sw itch S705
I
12
SW2
Programable sw itch S704
I
13
B
Pow er supply (Vcc)
O
14
B
Pow er supply (Vcc)
O
15
SW3
Programable sw itch S703
I
16
SW4
Programable sw itch S702
I
17
TEST
Test sw itch
I
18
SW5
Programable sw itch S701
I
19
SW6
Programable sw itch S700
I
0
EN7
Shift register enable signal
O
21
M DAT
M ic connector J700 (8pin)
I
22
DT
Serial data for IC703
O
23
CK
Common serial clock
O
24
GND
Ground
-
25
M I
M icrophone signal
I
26
M IG
M icrophone ground
-
Summary of Contents for TKR-740
Page 97: ...TKR 740 TKR 740 BLOCKDIAGRAM 121 122 ...
Page 99: ...TKR 740 TKR 740 INTERCONNECTION DIAGRAM 125 126 ...
Page 101: ...MEMO 129 ...
