CMI9761A Datasheet, PDF (14/23 Pages) List of Unclassifed Manufacturers – C-Media CMI9761A / 9761A+ 6 Channel AC97 2.3 Audio Codec

CMI9761A/9761A+ DataSheet
2004/02/09, Rev 1.2
6. Jack Detection and Configuration Information
In this section, we describe the resistors network method for jack
detection and configuration identification. And also, due to the design
of CMI9761A/9761A+ with shared audio function and dedicated
multi-channel output, the configuration of audio system can be as
versatile as possible.
6.1 Resistors Network Method
+5VA
1K
To Sense Pin
1K
J1
J2
BA
2K
J3
4K
8K/Open
C
A. The switch will be closed if audio connector is plugged in.
B. The switch will be open if audio connector is plugged out.
C. The configuration is identified if a weighting resistor is attached.
Figure 2. Resistors Network Method for Jack Detection
The sense pin connects to an ADC internally to measure the resistance
of the network. CMI9761A/9761A+ is able to monitor the plugging
status of each jack according to the resistance measured. To obtain a
correct result, the value of each precision resistor should not be
modified from the specified schematics provided by C-Media for any
reason.
Copyright 2003-2004 © C-Media Electronics Inc.
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