WM8990ECS/RV Wolfson Microelectronics, WM8990ECS/RV Datasheet - Page 135

• Manufacturer Part Number: WM8990ECS/RV
• Description: Audio CODECs Stereo CODEC w.Class AB/D speaker driver
• Manufacturer: Wolfson Microelectronics

Specifications of WM8990ECS/RV

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

w
Production Data
Table 85 Output Discharge Control
VMID REFERENCE DISCHARGE CONTROL
The VMID reference can be discharged to AGND through internal resistors. Discharging VMID
ensures that a subsequent start-up procedure commences with a known voltage condition; this is
necessary in order to ensure maximum suppression of audible pops associated with start-up. VMID
is discharged by setting VMIDTOG, as described in Table 86.
Table 86 VMID Reference Discharge Control
R56 (38h)
Anti-Pop (1)
R57 (39h)
Anti-Pop (2)
REGISTER
REGISTER
ADDRESS
ADDRESS
5
4
3
2
1
0
0
BIT
BIT
DIS_LLINE
DIS_RLINE
DIS_OUT3
DIS_OUT4
DIS_LOUT
DIS_ROUT
VMIDTOG
LABEL
LABEL
0b
0b
0b
0b
0b
0b
0b
DEFAULT
DEFAULT
Discharges LOP and LON outputs via
approx 500Ω resistor
0 = Not active
1 = Actively discharging LOP and LON
Discharges ROP and RON outputs via
approx 500Ω resistor
0 = Not active
1 = Actively discharging ROP and RON
Discharges OUT3 output via approx 500Ω
resistor
0 = Not active
1 = Actively discharging OUT3
Discharges OUT4 output via approx 500Ω
resistor
0 = Not active
1 = Actively discharging OUT4
Discharges LOUT output via approx 500Ω
resistor
0 = Not active
1 = Actively discharging LOUT
Discharges ROUT output via approx 500Ω
resistor
0 = Not active
1 = Actively discharging ROUT
Connects VMID to ground
0 = Disabled
1 = Enabled
DESCRIPTION
DESCRIPTION
PD, March 2009, Rev 4.0
WM8990
135