WM8978 Wolfson Microelectronics Ltd., WM8978 Datasheet - Page 64

• Manufacturer Part Number: WM8978
• Description: The WM8978 is a low power, high quality stereo codec designed for portable applications such as Digital still camera or Digital Camcorde
• Manufacturer: Wolfson Microelectronics Ltd.

WM8978
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Figure 32 Unused Input/Output Pin Tie-off Buffers
Table 48 Unused Output Pin Tie-off Options
A dedicated buffer is available for tying off unused analogue I/O pins as shown in Figure 32. 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 32 summarises the tie-off options for the speaker and mono output pins.
L/ROUT2EN/
OUT3/4EN
0
0
0
0
1
1
OUT3BOOST/
OUT4BOOST/
SPKBOOST
0
0
1
1
0
1
VROI
X
X
0
1
0
1
1kΩ tie-off to AVDD/2
30kΩ tie-off to AVDD/2
1kΩ tie-off to 1.5xAVDD/2
30kΩ tie-off to 1.5xAVDD/2
Output enabled (DC level=AVDD/2)
Output enabled (DC level=1.5xAVDD/2)
OUTPUT CONFIGURATION
PTD Rev 2.6 November 2005
Preliminary Technical Data
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