1-18 (No.RA011<Rev.001>)
2.6
COMPONENTS DESCRIPTION
2.6.1 Display Unit (X54-3890-20)
2.6.2 TX-RX Unit (XC1-0010-XX)
129 NC
O No connection
130 VSS
- GND
131 VDD
- 33MD
132 NC
O No connection
133 SWO
O SWO for SWD
134 SRST
O SRST for SWD
135 BLULED
O Blue LED
136 GRNLED
O Green LED
137 REDLED
O Red LED
138 BOOT_0
Test Point to enable Bootloader
139 IGN
I Ignition Sense
140 POWKEY
I Power Key Input
141 BATT_INT
I MCU Stop
142 CML_IRQ
I Baseband IC IRQ (CML_pin8)
143 Power On
Reset
I 33MD
144 VDD
- 33MD
Ref. No.
Part Name
Description
IC1
IC
LED driver
Q1, Q2
Transistor
TX/RX indication LED switch
Q3, Q4
Transistor
KEY backlight control switch
Q5, Q9
Transistor
LED dimmer control switch
Q6
Transistor
Indication LED switch
Q7, Q8
Transistor
TX/Busy indication LED switch
D1~D5
LED
KEY backlight
D20
Diode
Voltage protection
D22
LED
Indication
D23
LED
TX/Busy indication
D33
Zener diode
Surge protection
D37
LED
LED display
Ref. No.
Part Name
Description
IC2
IC
PLL IC
IC3
IC
Assist Filter
IC301
IC
APC DC amplifier
IC500
IC
DETAF amplifier
IC501
IC
FM IC
IC502
IC
Voltage regulator (33MS)
IC503
IC
RF BPF DC amplifier
IC700
IC
I2C level shifter
IC701
IC
3.3V level shifter
(RXDO/CTSO)
IC702
IC
IO expander
Pin
No.
Port Name
I/O
Function
IC703
IC
5V level shifter (TXDO/RTSO)
IC704
IC
RS-232C driver
IC705
IC
5V level shifter (TXD2)
IC706
IC
MIC/AFO amplifier
IC709
IC
Baseband IC
IC710
IC
Voltage regulator (33BD)
IC713
IC
19.2MHz amplifier
IC714
IC
MCU
IC715
IC
Evol/DAC
IC716
IC
EEPROM
IC717
IC
Voltage regulator (9R)
IC718
IC
Voltage regulator (33MD)
IC720
IC
Voltage regulator (33MA)
IC721
IC
Voltage regulator (5M)
IC722
IC
Voltage detection (INT)
IC723
IC
Voltage detection (Reset)
IC724
IC
5V level shifter (MKEY/PTT)
IC725
IC
3.3V level shifter (MKEY/PTT)
IC726
IC
Voltage regulator (33C)
Q2
Transistor
PLL Fin amplifier
Q3, Q4
FET
Assist filter control switch
Q5
FET
RX VCO
Q6
FET
TX/RX VCO switch
Q7
FET
TX VCO
Q9
Transistor
TX/RX VCO switch
Q10
Transistor
Ripple filter
Q11
Transistor
VCO buffer amp
Q12
Transistor
VCO common amp
Q300
FET
Drive amp
Q500
Transistor
RX 2nd local amp
Q501
Transistor
1st IF amp
Q502
Transistor
Squelch amp
Q503
FET
Mixer
Q504
Transistor
Squelch input switch
Q505
Transistor
Squelch input control switch
Q506
FET
Front-end LNA
Q700
FET
MIC mute switch
Q701
Transistor
MIC mute switch
Q702
Transistor
Horn alert control switch
Q703
FET
Horn alert switch
Q704
Transistor
DETO amp
Q705
FET
MOD2 switch
Q706
Transistor
Ignition sense control switch
Q707
Transistor
9R control switch
Q708
Transistor
9T control switch
Q709
Transistor
9R switch
Ref. No.
Part Name
Description
Содержание NX-840
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