Circuit Descriptions
7.
7.4.8
Audio Amplifier
The platform uses I
2
S to link the audio amplifier IC, it is using
pins 27, 28, 29 and 30 of IC U601.
Figure 7-11 Audio Amplifier
7.4.9
Mute circuit
It is DC drop detect circuit. Check +5VSB, if it is dropped, the
OFF_MUTE/PWRDN will send out a “high” pulse to turn on the
related mute circuit.
Figure 7-12 Mute circuit
7.4.10 ARC (HDMI)
ARC (audio return channel) is supported on HDMI 1 only.
When an ARC command is received from CEC, then IC U502
will be enabled and an SPDIF signal will be available on
HDMI 1, pin 14.
Figure 7-13 ARC (HDMI)
19090_215_110422.eps
110422
OSCL0
LRCLKI
AMP_RESET
PLL_GND
PLL_FILTER
SDI
VDD_PLL
XTI
A_ONSEL
OSDA0
A_GAIN
BICKI
PWRDN
OUT2B
OUT1A
AUD_VCC
OUT1B
AUD_VCC
OUT2A
AUD_V33
AUD_V33
I2S AUDIO AMP
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
C626
100N 16V
C626
100N 16V
L603
47UH
L603
47UH
C612
100N 16V
C612
100N 16V
R60
3
6.
2 OHM
1/
4W
R60
3
6.
2 OHM
1/
4W
C634
100N 16V
C634
100N 16V
R607
22 OHM 1/4W
R607
22 OHM 1/4W
L602
47UH
L602
47UH
U601
STA339BWTR
U601
STA339BWTR
GND_SUB
1
SA
2
TEST_MODE
3
VSS
4
VCC_REG
5
OUT2B
6
GND2
7
VCC2
8
OUT2A
9
OUT1B
10
VCC1
11
GND1
12
OUT1A
13
GND_REG
14
VDD
15
CONFIG
16
OUT3B
17
OUT3A
18
EAPD/OUT4B
19
TWARN/OUT4A
20
VDD_DIG
21
GND_DIG
22
PWRDN
23
VDD_PLL
24
FILTER_PLL
25
GND_PLL
26
XTI
27
BICKI
28
LRCKI
29
SDI
30
RESET
31
INT_LINE
32
SDA
33
SCL
34
GND_DIG
35
VDD_DIG
36
Thermal Pad
37
R61
8
6.
2 O
H
M
1/
4W
R61
8
6.
2 O
H
M
1/
4W
C610
100N 16V
C610
100N 16V
L601
47UH
L601
47UH
C622
100N 16V
C622
100N 16V
C617
100N 16V
C617
100N 16V
C629
330PF 50V
C629
330PF 50V
R615
100R 1/16W 5%
R615
100R 1/16W 5%
R612
6.
2 O
H
M
1/
4W
R612
6.
2 O
H
M
1/
4W
R616
100R 1/16W 5%
R616
100R 1/16W 5%
R606
6.
2 OHM
1/
4W
R606
6.
2 OHM
1/
4W
L604
47UH
L604
47UH
R611
0R05 1/16W
R611
0R05 1/16W
R602
22 OHM 1/4W
R602
22 OHM 1/4W
C608
100N 16V
C608
100N 16V
C623
100N 50V
C623
100N 50V
C635
100N 16V
C635
100N 16V
C625
100N 16V
C625
100N 16V
C636
100N 16V
C636
100N 16V
C614
330PF 50V
C614
330PF 50V
C619
100N 50V
C619
100N 50V
19090_216_110422.eps
110422
PWRDN
OFF_MUTE
AMP_MUTE
+12V
+5V_STB
DV33SB
DV33
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
SMD/0402
R637
100K1/16W
R637
100K1/16W
R624
4.7K1/16W
R624
4.7K1/16W
R629
NC/0R05 1/10W 5%
R629
NC/0R05 1/10W 5%
R620
10K 1/16W 5%
R620
10K 1/16W 5%
D601
BAS316
D601
BAS316
A
1
K
2
D603
BAS316
D603
BAS316
A
1
K
2
R634
1K 1/16W 5%
R634
1K 1/16W 5%
+
C649
220UF 16V
+
C649
220UF 16V
D604
BAS316
D604
BAS316
A
1
K
2
R633
4.7K1/16W
R633
4.7K1/16W
D602
BAS316
D602
BAS316
A
1
K
2
R622
22K 1/16W 5%
R622
22K 1/16W 5%
R619
10K 1/16W 5%
R619
10K 1/16W 5%
Q603
BC857BW
Q603
BC857BW
1
2
3
R630
0R05 1/10W
R630
0R05 1/10W
Q601
BC847BW
Q601
BC847BW
19090_217_110422.eps
110422
ARC_GPIO
AVDD33_HDMI
ARC_HDMI
M_SPDIF_Out
ARC
SMD/0402
SMD/0402
SMD/0402
R538
180OHM 1/10W
R538
180OHM 1/10W
R544
NC/10K 1/16W 5%
R544
NC/10K 1/16W 5%
R546
NC/5K1 1/16W 5%
R546
NC/5K1 1/16W 5%
R542
100K 1/10W 5%
R542
100K 1/10W 5%
C503
1UF16V
C503
1UF16V
R543
100R 1/16W 5%
R543
100R 1/16W 5%
U502
SN74LVC1G125DBVR
U502
SN74LVC1G125DBVR
OE
1
A
2
GND
3
Y
4
VCC
5
R545
82R 1/10W 5%
R545
82R 1/10W 5%