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3.3.17 Audio Connectors
®
According to SMARC
Rel. 2.1.1 specification, SMARC
For this reason, on the CSM-B79 carrier board there are both an I2S Audio Codec (TI p/n TLV320AIC3204), connected to I2S0 interface, and an HD Audio codec
(Cirrus Logic CS4207), connected to I2S2 / HD Audio interface.
TRRS Audio headset jack- CN41
Pin
Signal
TIP
Line Out Left Channel
RING1
Line Out Right Channel
RING2
Mic_IN_p or Mic_IN_n signal
SLEEVE
Mic_IN_n or Mic_IN_p signal
I2S Audio Header
Pin
Signal
Pin
Signal
1
GND
2
GP_I2C_DAT_3V3
3
+3V3_RUN
4
GP_I2C_CLK_3V3
6
---
7
+12V_RUN
8
I2S2_SDIN_3.3V
9
+3V3_RUN
10
I2S2_SDOUT_3.3V
11
GND
12
I2S2_LRCLK_3.3V
13
+3V3_RUN
14
I2S2_RST#_3.3V
15
GND
16
I2S2_CLK_3.3V
CSM-B79
CSM-B79 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author: A.R - Reviewed by S.R. - Copyright © 2021 SECO S.p.A.
®
modules include an I2S0 dedicated interface and an I2S2 / HD Audio shared interface.
Both these codecs are connected to a single TRRS Combo Audio Socket, i.e. a single
socket which offer both stereo Line Out and Mic In functionalities.
Such TRRS Combo Audio socket can be used with any 4-poles 3.5mm diameter audio
jack, with pinout compatible with the most recent Headsets, shown in the table on the left.
The TRSS Audio Headset jack can support indifferently Headset with Mic In_p signal on RING2 position and
Mic In_n signal on SLEEVE position or viceversa.
Since only one Codec at a time can manage this connector, it is necessary to switch the connection from
the TRRS jack to the proper codec by using the dedicated dual DIP switch SW16, described below.
If the SMARC
CN81
will manage the I2S0 interface from card edge connector for the TRSS Audio Jack
CN41. In addition, if the SMARC
I2S2 interface from card edge connector is made available, without further elaborations, on a dedicated I2S
Audio header CN81, which is a 15-pin pin header, p2.54 mm h= 6mm, type NELTRON p/n 2213S-16G-E5
or equivalent, with the pinout shown in the table on the left. This connector can be used to connect external
audio codec modules, specific for the kind of interface offered by the SMARC
If the SMARC
interface from card edge connector for the TRSS Audio Jack CN41. In this case, only the support on TRSS
Audio Jack CN41 will be available, since I2S2 / HD Audio share the same pins from card edge connector.
To proper setting, refer to I2S / HDA Codec selector DIP switch SW16 below.
SW16 Switch
1
2
®
module has I2S audio support, then the I2S Audio Codec on-board
®
module has a secondary I2S audio support, the
®
module has HD audio support, then the HD Audio Codec on-board will manage the HDA
ON Position
3
---
4
HDA codec to audio jack CN41
®
module used.
OFF Position
---
I2S0 codec to audio jack CN41
I2S2 interface to pin header CN81
62
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