Kenwood TK-2180 Service Manual page 41

Pin No. Name I/O
5 EMC I External MIC input
Impedance : 1.8kΩ typ (at 1kHz)
Audio level : 7.5± 2.5mVrms for 60% of
system deviation
Nominal DC voltage : 5.0± 1V DC
6 ME - External MIC GND
7 PTT I External PTT input
8 PF I Programmable function key input
Input voltage : 0V~5.0V
Input level : 4.4V~5.0V (None), 3.1V~4.4V
(PF2 key ON), 2.3V~3.1V (PF1 key ON), 0V~
2.3V (PF1,PF2 key ON) (Pull up to 5V 10kΩ)
9 OPT - Non connection
10 E - GND
11 5U O 5V power supply output
Max output current : 140mA
12 TXD O Serial data output
L ≤ 0.45V, H ≥ 4.7V/25kΩ load
Baud rate : 115200bps max
13 RXD I Serial data input
Input : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0V
Baud rate : 57600bps max
14 NC (E) - Not use (GND)
Solder pad
Name I/O
OPT5 O Option boad I/F 5
Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ load
OPT6 O Option boad I/F 6
Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ load
OPT3 I/O Option boad I/F 3
Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ load
Input : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0V
OPT1 O Option boad I/F 1
Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ load
TERMINAL FUNCTION
Function
L : PTT ON
Function
Name I/O
RXD I Serial data input
Input : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0V
TXD O Serial data output
Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ load
RXI I Audio signal input (DC coupled) before de-emphasis
STON I Side tone input
TCONT I Speaker mute signal input
Input : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0V
TXO O MIC signal output (AC coupled) before pre-emphasis
ZL ≥ 22kΩ, 130± 50mVp-p
RXEO O Audio signal output (DC coupled) after de-emphasis
ZL ≥ 30kΩ, 1± 0.3Vp-p
OPT2 I/O Option boad I/F 2
Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ load
Input : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0V
OPT4 O Option boad I/F 4
Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ load
GND - GND
SB2 I Power input after power switch
7.5V typ, 100mA max
RXEI I Audio signal input (DC coupled) after de-emphasis
Zin ≥ 15kΩ, 1± 0.3Vp-p
TXI I MIC signal input (AC coupled) before pre-emphasis
Zin ≥ 22kΩ, 130± 50mVp-p
RXO O Audio signal output (DC coupled) before de-emphasis
5A O 5V power supply output
DI/ANI I Data signal input
INH O MIC mute signal input
RSSI O RSSI output Zo=56kΩ
MDSW I Man down switch input
Input : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0V
GND - GND for man down switch
RXD1 I Serial data input
Input : L ≤ 1.0V, H ≥ 4.0V, Input voltage : 0V~5.0V
TXD1 O Serial data output / PTT signal output (SC20-460)
Output : L ≤ 0.45V, H ≥ 4.7V/25kΩ load
TK-2180
Function
1kHz, 5Vp-p
78mA max
Zin ≥ 22kΩ, 600± 200mVp-p
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