WM8978_06 Wolfson Microelectronics Ltd., WM8978_06 Datasheet - Page 74

• Manufacturer Part Number: WM8978_06
• Description: Stereo Codec With Speaker Driver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8978
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Figure 37 Unused Input/Output Pin Tie-off Buffers
Table 55 Unused Output Pin Tie-off Options
A dedicated buffer is available for tying off unused analogue I/O pins as shown in Figure 37. 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 37 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
PP Rev 3.0 May 2006
Pre-Production
74