Schematics
Table Of Contents
1
1
2
2
3
3
4
4
D D
C C
B B
A A
MCU
Earphone、Mic、LED、Power
+
M1
MIC
C19
NC/104
MIC
R3
6.8K
DACVDD
KEY
C4 NC
C5
224
DACVDD
AGND
DACL
DACR
MIC
LED_B/R
BT_OSCO
BT_OSCI
+3.3V
C7 104
VBAT
GND
C8
105
C11 105
RTCVDD
BT_ANT
L4
1NH
L3
1NH
BT_RF
C9 105
P/P/POWER
BT_AVDD
BT_ANT1
LDO_IN
D1
BLUE
LED_B/R
D3
RED
R4
470R
+3.3V
VDDIO
1
VBAT
2
RTCVDD
5
DACVSS
15
DACVDD
16
ADC11/USBDM
11
MIC/PA0/ADC10/USBDP
12
BT_OSCI
9
BT_OSCO
10
BT_RF
7
VSSIO
8
BT_AVDD
4
DACL
14
LDO_IN
3
PR2/ADC13
6
DACR
13
U2
AC6919A_SOP16
S1
NEXT/V-
S2
PREV/V+
S3
P/P/POWER/TALK
P/P/POWER
R12
200K
R11
100K
R9
33K
RTCVDD
C1
NC
R5
2M
BT_OSCO BT_OSCI
Y1 24M
J1
Earphone
DACL
DACR
BT1
3.4V~4.2V
VBAT
+5V LDOIN
R1
10R
+5V
1
DM
2
DP
3
ID
4
6
GND
6
6
6
6
USB2
USB(MICRO)
R6
NC/1K
C10
104/NC
R2
470R