wm8982gefl-v Wolfson Microelectronics plc, wm8982gefl-v Datasheet - Page 71

• Manufacturer Part Number: wm8982gefl-v
• Description: Mono Codec With Speaker Driver And Video Buffer
• Manufacturer: Wolfson Microelectronics plc

Pre-Production
GENERAL PURPOSE INPUT/OUTPUT
w
Figure 46 u-Law Companding
Figure 47 A-Law Companding
The WM8982 has two dual purpose input/output pins and one dedicated GPIO.
The JDET function is provided for use as a jack detection input.
The GPIO1 and GPIO2 functions are provided for use as jack detection inputs or general purpose
outputs.
The default configuration for the CSB/GPIO1 and GPIO2 pins are to be inputs.
When setup as an input, the CSB/GPIO1 pin can either be used as CSB or for jack detection,
depending on how the MODE pin is set.
If setup as an input the GPIO2 pin can also be used for jack detection.
Table 49 illustrates the functionality of the GPIO1 and GPIO2 pins when used as general purpose
outputs.
•
•
•
120
100
120
100
80
60
40
20
80
60
40
20
0
0
CSB/GPIO1: CSB / GPIO pin
LINEIN/JDET: Line input / headphone detection input
GPIO2: 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
PP, Rev 3.2, September 2008
0.9
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
WM8982
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