Schematics

C7 105 VDDIO
C14 225 VBAT
5
1
3 2
1
2
3
4
D
D
U1
AB5616A QFN20 3*3
RFGND
AGND
VUSB
VDDIO
VBAT
LX
CHRG_LED
BLUE_LED LED2
LED
Earphone
C12
DACL
DACL#
C16
NC
LOUT1
LOUT#1
C
C
Receive and
connect
PWRKEY
B
B
KEY
Charging warehouse support:
5V often or 5V power 2-3.5V after the
charge
Support for picking up the boot
functi on
VUSB
C17
10pF
GND1
C15
VBAT
VBAT1
10pF
GND2
Connect the interface using the Xlink upgrade
tool.
The computer has set up the upgrade interface.
The upgrade prototype is turned on and
automatically upgrade.Wait for the upgrade to complete.
Upgrade interface is reserved:
Group 1: VBAT / GND / PB3
MICIN
Resident body MIC MIC1
MIC Low-cost circuit
A
A
POWER
upDate
MIC
1
2
3
4
ADC2/PA
7
ADC5/PB
3
ADC6/PB
4
C1
1
10pF
2
14 BLUE_LED
13
CHRG_LED
C10 NC VUSB
NC
0.5pF
15
ANT1 PCB
C5 C3
12 OSCO
+
upDate1
NC/0R
OSCI
0
26MHZ
VUSB
1
2.2pF
10uH
BLUE
C9
LED1
5pF
RED
475
105
NC
11
Y1
C2
C8
C4
R1
L1
4
2
3
3
1
1
V
D
DB
T
V
D
DB
T
10
6
P
W
RK
EY
18
D
AC
L
19
V
D
D
D
A
C
C7
16
MI
CI
N
17
D
A
C
L#
D
G
N
D
V
D
DB
T
20
N
C
V
D
DB
T
B
T_
A
N
T
D
AC
L
P
W
RK
EY
A
D
C1
0/
MI
C/
PF
2
V
D
D
D
AC
V
C
M
BU
F
10
5