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WM8980 Datasheet(PDF) 52 Page - Wolfson Microelectronics plc

Part # WM8980
Description  STEREO CODEC WITH SPEAKER DRIVER AND BUFFER
PDF  81 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8980 Datasheet(HTML) 52 Page - Wolfson Microelectronics plc

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PP Rev 1.6 January 2005
52
A dedicated buffer is available for tying off unused analogue I/O pins as shown in Figure 22. This
buffer can be enabled using the BUFIOEN register bit.
If the SPKBOOST, OUT3BOOST or OUT4BOOST bits are set then the relevant outputs will be tied
to the output of the DC level shift buffer at 1.5xAVDD/2 when disabled.
Figure 22 summarises the tie-off options for the speaker and mono output pins.
Figure 22 Unused Input/Output Pin Tie-off Buffers
L/ROUT2EN/
OUT3/4EN
OUT3BOOST/
OUT4BOOST/
SPKBOOST
VROI
OUTPUT CONFIGURATION
0
0
0
1kΩ tie-off to AVDD/2
0
0
1
30kΩ tie-off to AVDD/2
0
1
0
1kΩ tie-off to 1.5xAVDD/2
0
1
1
30kΩ tie-off to 1.5xAVDD/2
1
0
X
Output enabled (DC level=AVDD/2)
1
1
X
Output enabled (DC level=1.5xAVDD/2)
Table 43 Unused Output Pin Tie-off Options



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