OS8121X Slim Board Family
DS60001523A-page 26
2017 Microchip Technology Inc.
4.2
PRODUCT FEATURES
• Supports a network speed grade of 50 Mbits/s
• Available for electrical physical layer (ePHY) applications
• Configuration/Debug Header Connector
• Lock detection monitor (Lock LED)
• Active jack (for noise cancellation; audio sockets are only active when jack is
plugged-in)
• Microphone input (with phantom power)
• Line input
• Headphone output
• One button for channel select
• Two buttons for volume adjust
• Is identified in the network by its node address 0x0240
4.3
FUNCTIONAL DESCRIPTION
gives an overview of the board’s main components.
The OS81214 Slim Auxiliary I/O Board provides an electrical Physical Layer (ePHY)
interface to the network. The electrical interface is implemented with passive front-end
components [
]. The Power Injector Box provides 12 V that are used to feed the on-
board power supply, which provides 1.8 V INIC core supply and 3.3 V for INIC I/Os and
other components. As long as the output voltage of the power supply is not stable, the
INIC will be hold in reset.
The
Configuration/Debug Header Connector
is used to read, load or customize the
INIC’s initial start-up configuration data.
The stereo audio codec UDA1380 is connected to the INIC through one I
2
C port and
two Streaming (I
2
S) ports. It provides a headphone output, a stereo line input and a
mono microphone input.
FIGURE 4-2:
BLOCK DIAGRAM
Configuration/
Debug Header
Connector
1.8 V
3.3 V
Power Supply
INIC
Network
and
PoDL
12 V
I
2
C
I
2
S_B
I
2
S
TM
_A
Headphone
Line In
Microphone
Physical
Layer
Interface
Reset
UDA 1380
Note:
Use of microphone and line input at the same time is not supported.
