Schematics

JTK-DXP SCH
POWER
PA
MCU/LED
DC 5V IN
POWER
PREV
NEXT
PP
CALL
KEY
1
SD
2
BYPASS
3
A/B
4
IN
8
VOP
7
GND
6
VDD
5
VON
U1
2018A
SPK
R4
68K
C4
105
C3
106
BAT
3.7V
D2
RED
R1
4.7K
R7
1K
C2
105
1
TEMP
2
PROG
3
GND
4
VCC
8
CE
7
SHRG
6
STDBY
5
BAT
U2
4056
L1
600R/100mhz
NTC
250MA
R2
NC
R5
4.7K 1%
。
1
2
T
10K
Y1
24MHz
BTANT
C7
NC
C8
105
C6
105
1
LDO
2
VBAT
3
VDDIO
4
PB1/AD5
5
FMIP
6
BT-RF
7
BT-OSCI
8
BT-OSC
16
DACL
15
VCOM
14
VSSIO
13
ADC1/MIC/PA1
12
ADC3/ADC13/PA4/USBDP
11
ADC14/USBDM
10
ADC11
9
ADC12
U3
AC6969A
C1
223
R3
NC
D1
MIC
S3
S4
S1
S2
S5
MUTE
VBAT
+5V
+
5
V
LED DACL
+3.3V
VBAT
A
G
N
D
DACL
LED
MUTE
GND
MIC
ADKEY
KEY2
KEY1
ADKEY
A/B
KEY1
KEY2
MIC
A/B
GND
VBAT