WM8985_07 WOLFSON [Wolfson Microelectronics plc], WM8985_07 Datasheet - Page 73

• Manufacturer Part Number: WM8985_07
• Description: Multimedia CODEC With Class D Headphone and Line Out
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

Pre-Production
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Table 41 Disabled Outputs to VREF Resistance
Figure 30 Unused Input/Output Pin Tie-off Buffers
Table 42 Unused Output Pin Bias Options
A dedicated buffer is available for biasing unused analogue I/O pins as shown in Figure 30. This
buffer can be enabled using the BUFIOEN register bit.
Figure 30 summarises the bias options for the output pins.
R49 (31h)
L/ROUT2EN/
REGISTER
ADDRESS
AVDD/2
OUT3/4EN
0
0
1
Used to tie off all unused
inputs and outputs
-
+
0
BIT
BUFIOEN
R1[2]
VROI
AVDD/2
X
0
1
VROI
LABEL
Analogue inputs
1k Ω to AVDD1/2
30k Ω to AVDD1/2
Output enabled (DC level=AVDD1/2)
0
OUTPUT CONFIGURATION
DEFAULT
30k
30k
30k
30k
30k
30k
1k
1k
1k
1k
1k
1k
R49[0]
R49[0]
R49[0]
R49[0]
R49[0]
R49[0]
VROI
VROI
VROI
VROI
VROI
VROI
VREF (AVDD1/2) to analogue output
resistance
0 = approx 1kΩ
1 = approx 30 kΩ
ROUT2
LOUT1
ROUT1
OUT4
OUT3
LOUT2
DESCRIPTION
PP, Rev 3.5, January 2007
WM8985
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