Schematics

MCU
BT_ANT
XTAL
LED
CHG
L3
4.7uH
C8
225
C13
225/ 25V
1
GPIO14
2
GPIO13_SD_DAT0
3
RSTN
4
RF
5
GPIO0_TXD
6
GPIO1_RXD
7
LINER
8
LINEL
9
GPIO15_GPIO3
10
GPIO11_SD_CLK
11
GPIO12_SD_CMD
12
VDDDIG
13
SWD
14
SWA
15
VDDANA
16
VCC4BAT
17
VCC3SYS
18
VCC5USB
19
VDDALON
20
VDDIO3VFLA
21
AUDRP
22
AUDRN
23
AUDLN
24
AUDLP
25
MICREF
26
MICRN
27
MICRP
28
GPIO7_USBDN
29
GPIO6_USBDP
30
VDDBT
31
XO
32
XI
BK3266_QFN32 LD
C18
224
C19
105/ 25V
L2
4.7uHC9
225
C23
NC
C7
105
C5
474
1
BT_ANT
L1
NC
C10
2.7PF
C1
10PF
L4
NC
1 3
2 4
Y1
26MHz
D1
RED
R25
1K
D2
BLUE
R24
1K
1
L+
1
L-
1
R+
1
R-
R4
15R
R5
15R
1
VBAT
1
5V
1
GND
1
RX
1
TX
1
VCC
2
D-
3
D+
4
ID
5
GND
9 8
6 7
USB1 R2
220R
R3
220R
FB3
600R@100MHZ
R10
4.7K
1
B-
1
B+
4 3
1 2
P/ P
4 3
1 2
V+
4 3
1 2
V-
R6
2.2K
1
2
MIC2
C4
474
C14
225
1
SHUNT-D
2
NC
3
IN+
4
IN-
5
VO+
6
VDD
GND
8
VO-
1
1
RFP
GPIO00/ TXD
GPIO01/ RXD
XI
XO
V2MICBIAS
BAT
5V
LN
LP
MIC_P
GPIO11 GPIO15
VCC3SYS
GPIO7
GPIO12
GPIO6
RN
RP
RFP
XI XO
GPIO12
GPIO11
LP
RP
LN
RN
BAT
5V
GPIO00/ TXD
GPIO01/ RXD
GPIO00/ TXD
GPIO01/ RXD
5V
BAT
GPIO6
GPIO7
VCC3SYS GPIO15
MIC_P
V2MICBIAS
RP
RN
MUTE
BAT
MUTE
R11
7
R+
R-
1
00K
100K
104
10 4
105
C17
C20
C16
R8
R9
U3 NS4150B
R12 1 0 K
100K
C21 225
U1 BK3266
GPI O0¡ ¢1¡ ¢2 ¡ ¢3¡ ¢4¡ ¢5¡ ¢14
PWM: GPI O6¡ ¢7¡ ¢11¡ ¢12¡ ¢13¡ ¢14
AD: £º GPI O2 ¡ ¢3¡ ¢11¡ ¢13¡ ¢14