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WM8978CGEFL/V Datasheet(PDF) 69 Page - Wolfson Microelectronics plc

Part # WM8978CGEFL/V
Description  Stereo CODEC with Speaker Driver
PDF  118 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8978CGEFL/V Datasheet(HTML) 69 Page - Wolfson Microelectronics plc

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Production Data
WM8978
w
PD, Rev 4.5, October 2011
69
A dedicated buffer is available for tying off unused analogue I/O pins as shown in Figure 35. 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 35 summarises the tie-off options for the speaker and mono output pins.
Figure 35 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 52 Unused Output Pin Tie-off Options



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