W681308DG Datasheet, PDF (61/64 Pages) Nuvotem Talema – W681308 USB Audio Controller from Nuvoton integrates fast 8051 Microcontroller Unit (MCU)

W681308
XXXX PRODUCT DESCRIPTION
21.
Typical Application Reference Circuit
S1
1
S2
2
S3
3
S4
Mode
S5
HangUp
S6
4
S11
7
S7
5
S12
8
S8
6
S13
9
S9
Up
S14
Skype
S10
Down
S15
Dial
USB_5V
S16
*
PUSHBUTTON
S21 _User
S17
0
PUSHBUTTON
S22 _Melody
S18
#
S23
Up1
S19
Left
S20
S24
Down1
S25
UARTT
UARTR
DGND
USB Connector
DGND
C11
10nF
1
VCC
D- ²
3
D+
GND ⁴
Shielding
DJP1
The shielding of the
USB connector can't
connect to any GND.
USB_5V
R9 25
DGND
C4
33pF
DGND
C7
33pF
VDD_3.3V
R7
270
DY1
R8
1M
12M
DGND
C9
100nF
DGND
DGND
C8
10nF
DGND
UARTT 1 _UARTT
UARTR 2
UARTR
3
DGND
XTALO
XTALI
4
XTALO
5
XTALI
6 _VDDL
7
DVDD
DN
8 _DN
DP
9 _DP
10 _DGND
GPIO3 11 _GPIO3
GPIO0 12 _GPIO0
C12
51pF
R10 25
C13
C14
51pF
30pF
C15 _{VDD_3.3V}
30pF
DGND
DGND DGND
VDD_3.3V
DGND DGND
R11
D1
100
R12
LED
D2
100
LED
LCD Module (Serial Interface)
Right
Mute
R1
R2
R3
1M
100K
60K
1
R4
Q1
MMBT3906
300K
Q3
MMBT3904
R6
2K
C2
10nF
R5
100K
AGND
AGND
W681308_LQFP
U1
VREF1 ³⁶
35
VREF2
34
MCP
33
MCO
32
RGND
AGND ³¹
30
SPP
EARP ²⁹
AVDD ²⁸
EARN ²⁷
SPN ²⁶
AGND ²⁵
VREF1
VREF2
MCP
MCO 1
RGND
C5 100nF
C6 100nF
TP1
AGND
AGND
SPP
EARP
EARN
SPN
AGND
VDD_3.3V
C10
100nF
REC1
C16
100nF
AGND
VDD_3.3V
AGND
+ C1
1uF/10V
DGND
Q2
PZT2222A
VDD_3.3V
C3
220uF/10V
AGND
MIC1
1
2
SPK1
DGND
AGND
VDD_3.3V
C17
100nF
PCM interface is for
External Audio Device or
USB ATA wtih Pro-X
DGND
Figure 16 W681308 Reference Design Application Circuit
21.1 USB VoIP speaker phone application
The application diagram illustrated that the W681308 is a SOC with very low BOM system design. Externally it supports a
variety interfaces such as keypad, LCM, SLIC, SPI flash/EEPROM, Microphone and speakers directly. External 12M Crystal
as well as a 5V to 3.3V linear regulator is required. Ring tone download and playback is through the same Audio DAC path
with a switch for ringing and speech.
61
Rev1.2