WM8985GEFL Wolfson Microelectronics, WM8985GEFL Datasheet - Page 75

• Manufacturer Part Number: WM8985GEFL
• Description: Audio CODECs Multimedia CODEC with Class D HP
• Manufacturer: Wolfson Microelectronics

Specifications of WM8985GEFL

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
w
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
PD, Rev 4.6, July 2009
WM8985
75