Table of Contents
Advertisement
R116
100
GND
(1)
(2)
(3)
(4)
C615
1u
CP_C2y
41
CP_VOUT1/LED1
42
CP_VOUT2/LED2
43
PON/P1_6
44
VDD1
45
P2_7/BXTAL
46
P1_5/INT5/RDI/VDDE
47
P1_4/INT4/TDOD
48
P1_3/INT3/SIO
49
P1_2/INT2/SK
50
(5)
P1_1/INT1/LE
51
P2_6/WTF_IN
52
P0_7/SPI_DI
53
P0_6/SPI_DO
54
P0_5/SPI_CLK
55
P0_4/SPI_EN
56
P0_3/SCL2
57
P0_2/SDA2
58
P0_1/URX
59
P0_0/UTX
60
C72
GND
100n
(6)
10p
TEST
C70
GND
(7)
(8)
(9)
+2.5_CP
4
1
3
2
RA402
10k
C51
GND
100n
1
8
A0
VCC
2
7
A1
WP
3
6
A2
SCL
4
5
VSS
SDA
GND
*IC401
*R30
82
Q5
(1005) NC
C18
GND
GND
C155
6.8k
TP10
*R20
C22
R23
3.9k
R29
120
1u
100k
GND
GND
GND
R27
+1.8V
100k
GND
GND
GND
GND
GND
RX_AF
*C147
10p
*C148
10p
GND
Bell signal
GND
GND
C84
C54
0.022
C52
220p
RA1
2.2u
1k
GND
R36
R37
R32
100k
GND
180k
1k
GND
C136
10p
GND
CIDINn/MICp
C171
20
CIDOUT/MICn
10p
19
MICh
18
VREFm
17
LSRp
16
LSRn
15
AVD
14
LDO_CTRL
13
RF_SUPPLY1
*IC7
12
AVD_XTAL
11
XTAL1
10
XTAL2
GND
9
AVS_XTAL
8
REF_RES
7
RFP0
6
RFP1
5
VSS_LNA2
4
RF_RXn
3
RF_RXp
2
VSS_LNA1
1
GND
GND
VDD2
GND
C74
10p
GND
+2.5V
Q9
GND
LINE_DC
Q3
R14
100k
GND
Q4
TP9
*R13
GND
680
R17
2.2k
GND
GND
GND
GND GND
GND
GND
TX _AF
1.8V
+1.8V
VDD1
R33
1k
GND
C170
C169
10p
10p
GND
GND
C61
GND
C168
100n
10p
GND
C65
10p
C305
GND
GND
1u
C306
NC
R615
56k F
1
3
GND
X1
10.368M
R109
2
220
GND
ANT1
RXON
+2.5V
RF_RXn
GND
RF_RXp
TXON
TXn
TXp
VDD_PADRV
PSEL
PON
R106
220
ANT2
KX-TG8421HG SCHEMATIC DIAGRAM (Base Unit)
83
Loop Current
D3
1
2
4
3
*Q2
*R7
GND
+1.8V
NC
GND
GND
*R9
NC
GND
GND
C5
R3
R42
C42
0.001
180k
NC
NC
R4
1M
C3
1.5
C6
R5
R43
C43
0.001
180k
NC
NC
R6
1M
C4
1.5
3.0V
+3.0V
+8.0V
VDD3
IC1
2
Output
3
Input
4
Fin
ADJ/GND
1
GND
GND
GND
GND
Charge Current
250mVp-p
0.75V
0V
TO RF BLOCK
+1.8V
*Q22
RX _RF
R130
1k
*Q23
TX _RF
GND
GND
NC: No Components
KX-TG8421HGN/KX-TGA840FXN
L1
L2R
L1R
L1T
L2T
L2
HAK_CL1
Caller ID
Bell signal
F1
3A
GND
GND
DC_IN
J101
GND
GND
GND
*R126
TP16
NC
Charge +
D23
Charge -
GND
TP15
Advertisement
Table of Contents
Troubleshooting
