WM8900LGEFK/RV Wolfson Microelectronics, WM8900LGEFK/RV Datasheet - Page 29

• Manufacturer Part Number: WM8900LGEFK/RV
• Description: Audio CODECs Ultra Low Power Hi-Fi CODEC
• Manufacturer: Wolfson Microelectronics

Specifications of WM8900LGEFK/RV

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

R1 (01h)
Power Management 1
R30 (1Eh)
Additional Control
R58 (3Ah)
Headphone Control 1
Production Data
POP-CLICK MINIMISATION CONTROL REGISTERS
Table 9 Pop and Click Minimisation Register Settings
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REGISTER ADDRESS
BIT
It is recommended that the power management control bits are used to enable/disable the required
blocks within the WM8900 according to the desired application or mode. The sequencing of these
controls may be important in the reduction of audible pops and clicks. Detailed information is
available for specific requirements - see “Applications Information”.
The additional control bits described in Table 9 are normally set to default only but may be used to
control pops and clicks under certain conditions.
8
2
8
7
5
4
3
5
4
3
2
STARTUP_BIAS_ENA
VMID_BUF_ENA
OUT1_DIS
OUT2_DIS
VMID_DISCH
BIAS_SRC
VMID_SOFTST
HP_CLAMP_IP
HP_CLAMP_OP
HP_SHORT
HP_SHORT2
LABEL
DEFAULT
0
0
0
0
0
0
0
0
0
0
0
Bias Startup control.
Normally 0 but can be temporarily set to 1
during startup to minimise pops and clicks.
Provides VMID to input and output analogue
pins when not enabled.
Normally 0 but can be temporarily set to 1
during startup to minimise pops and clicks.
1 = Clamps LINEOUT_1L and LINEOUT_1R
to GND via 8K resistance
0 = 8k resistance not connected to GND
1 = Clamps LINEOUT_2L and LINEOUT_2R
to GND via 8K resistance
0 = 8k resistance not connected to GND
Enables fast discharge of Vmid to GND
Vmid bias select.
Normally 0 but can be temporarily set to 1
during startup to select the soft-start Vmid
source.
Vmid soft-start control.
Normally 0 but can be temporarily set to 1
during startup to ramp Vmid in a controlled
manner.
Clamps HP_INL and HP_INR to GND
Clamps HP_L and HP_R outputs to GND
Shorts the inputs to the outputs
Shorts the feedback resistor.
0 = Normal operation
1 = Shorts feedback resistor.
About 20dB ‘mute’ attenuation
DESCRIPTION
PD, August 2008, Rev 4.0
WM8900
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