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WM8974 датащи(PDF) 37 Page - Wolfson Microelectronics plc

номер детали WM8974
подробное описание детали  MONO CODEC WITH SPEAKER DRIVER
PDF  63 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8974 датащи(HTML) 37 Page - Wolfson Microelectronics plc

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WM8974
w
PP Rev 1.1 September 2004
37
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R49
0
VROI
0
VREF (AVDD/2 or 1.5xAVDD/2) to
analogue output resistance
0: approx 1k
Ω
1: approx 30 k
Ω
Table 26 Disabled Outputs to VREF Resistance
A dedicated buffer is available for tieing off unused analogue I/O pins as shown in Figure 16. This
buffer can be enabled using the BUFIOEN register bit.
If the SPKBOOST or MONOBOOST 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.
Table 27 summarises the tie-off options for the speaker and mono output pins.
Figure 16 Unused Input/Output Pin Tie-off Buffers
MONOEN/
SPKN/PEN
MONOBOOST/
SPKRBOOST
VROI
OUTPUT CONFIGURATION
0
0
0
1kΩ tieoff to AVDD/2
0
0
1
30kΩ tieoff to AVDD/2
0
1
0
1kΩ tieoff to 1.5xAVDD/2
0
1
1
30kΩ tieoff to 1.5xAVDD/2
1
0
X
Output enabled (DC level=AVDD/2)
1
1
X
Output enabled (DC level=1.5xAVDD/2)
Table 27 Unused Output Pin Tie-off Options



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