WM8980CGEFL/RV WOLFSON [Wolfson Microelectronics plc], WM8980CGEFL/RV Datasheet - Page 83

• Manufacturer Part Number: WM8980CGEFL/RV
• Description: Stereo CODEC with Speaker Driver and Video Buffer
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

Pre-Production
GENERAL PURPOSE INPUT/OUTPUT
w
Figure 49 u-Law Companding
Figure 50 A-Law Companding
The WM8980 has three dual purpose input/output pins and one dedicated GPIO.
The GPIO2 and GPIO3 functions are provided for use as jack detection inputs.
The GPIO1 and GPIO4 functions are provided for use as jack detection inputs or general purpose
outputs.
The default configuration for the CSB/GPIO1 and GPIO4 pins are to be inputs.
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


120
100
120
100
80
60
40
20
80
60
40
20
0
0
CSB/GPIO1: CSB / GPIO pin
L2/GPIO2: Left channel line input / headphone detection input
R2/GPIO3: Right channel line input / headphone detection input
GPIO4: Dedicated GPIO
0
0
0.1
0.2
0.2
0.3
u-law Companding
A-law Companding
0.4
Normalised Input
0.4
Normalised Input
0.5
0.6
0.6
0.7
0.8
0.8
0.9
PP, Rev 3.8, May 2012
1
1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
WM8980
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