wm8976gefl-v Wolfson Microelectronics plc, wm8976gefl-v Datasheet - Page 75

• Manufacturer Part Number: wm8976gefl-v
• Description: Stereo Codec With Speaker Driver
• Manufacturer: Wolfson Microelectronics plc

Production Data
GENERAL PURPOSE INPUT/OUTPUT
w
Figure 41 u-Law Companding
Figure 42 A-Law Companding
The WM8976 has two dual purpose input/output pins.
The GPIO2 function is provided for use as a jack detection input.
The GPIO1 function is provided for use as a jack detection input or a general purpose output.
The default configuration for the CSB/GPIO1 pin is to be an input.
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.
Table 49 illustrates the functionality of the GPIO1 pin when used as a general purpose output.
•
•
120
100
120
100
80
60
40
20
80
60
40
20
0
0
CSB/GPIO1: CSB / GPIO pin
L2/GPIO2: Line input / headphone detection input
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
PD Rev 4.4 July 2009
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
WM8976
75