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19 AUDIO CONNECTION CIRCUIT
42
EPSON
S5U1C17801T1100 HARDWARE MANUAL
(SOFTWARE EVALUATION TOOL FOR S1C17801)
19 Audio Connection Circuit
The SVT17801 is equipped with a 16-bit AudioCodec (TI model PCM3793). SVT17801 circuit related to the
AudioCodec is shown in the following diagram.
The SVT17801 connects the S1C17801 and the PCM3793 using I
2
C and I
2
S. I
2
C is used for the communication
of audio setup commands issued from the S1C17801 to the PCM3793. Two channels of I
2
S are available for
the S1C17801, i.e., Ch0 (signal name: I2S_***0) and Ch1 (signal name: I2S_***1), used for output and input
respectively.
Switching Audio Master Clock
The SVT17801 can switch the master clock for the PCM3793 between that from I2S_MCLK0 on the S1C17801
and that from an external transmitter. Specifically, either of the master clocks can be selected using a switch IC
connected to P32. Following table describes how the switching is possible.
Table 19.1.1 P32 Status and SCKI Connection Status
P32 SCKI (PCM3793) status
H Connects to SG-8002JC (12.288MHz crystal)
L Connects to I2S_MCLKO
VDD
VDD
OSC1
SG-8002JC-12.288M
U32
TS5A3159A
G V
VDD
R55 33
R83
47K
2
OE
GND
VDD
OUT
3
4
41
63
2
5
L6
L7
BLM18PG300SN1D
BLM18PG300SN1D
C41
10µF
AV
DD
R54 10K
R46 10K
S1C17801
S1C17801
I2C SCL
I2C_SDA
I2S MCLK1
I2S SDI1
I2S_SDO0
I2S_WS0/1
I2S_SCK0/1
I2S_MCLK0
P32
C43
C44
C45
C53
0.1µF
4.7µF
4.7µF
4.7µF
C29
L8
L9
L10
L11
BLM18PG121SN1D
BLM18PG121SN1D
BLM18PG121SN1D
BLM18PG121SN1D
1µF
C35
C36
C34
C33
C37
C38
C32
+
+
+
–
+
–
C31
1µF
1µF
1µF
1µF
1µF
1µF
R51
R50
R49
R48
R93
R94
2.2K
2.2K
2.2K
2.2K
2.2K
2.2K
47µF
C59
1000pF
C61
1000pF
C62
1000pF
C60
1000pF
47µF
R43
1
MIC1
EM6022P-42BC10&33-G
MIC GND
J15
SJ-3523-SMT
J14
SJ-43514-SMT
SP1
SP2
NDT-03B
NDT-03B
2
2
1
3
3
2
1
4
4.7
R42 4.7
C30
4.7µF
C64 0.1µF
R44
10K
R45
33K
U22
PCM3793ARHB
31
30
29
28
7
3
2
32
1
MC/SCL
MD/SDA
MS/ADR
MODE
SCKI
DOUT
DIN
LRCK
BCK
VIO
VDD
VCC
VPA
DGND
AGND
PGND
MICB
AIN1L
AIN1R
AIN2L
AIN2R
AIN3L
AIN3R
HDTI
HPOL/LOL
HPOR/LOR
HPCOM/MONO
SPOLP
SPOLN
SPORP
SPORN
VCOM
4
5
20
12
6
19
13
21
27
26
25
24
23
22
8
17
16
9
15
14
11
10
18
Fig. 19.1.1 AudioCodec IC Connection Circuit