WM8961 datasheet(112/116 Pages) WOLFSON

112 / 116 page

WM8961

Pre-Production

PP, August 2009, Rev 3.1

112

SETTING

COMMENT

0x0F - write

0x0000

Reset device if required

0x0F - read

Read Chip ID (=0x1801)

0x08 - write

0x01F4

Enable system clocks

0x52 - write

0x0003

Headphone Class W power switching

0x57 - write

0x0020

Enable the write sequencer, DAC to headphone

playback with -20dB volume setting.

0x5A - write

0x0080

Start the write sequencer to configure pre-programmed

enable of the DAC playback (digital input to headphone

output) path. Analogue input PGAs still muted.

Allow enough time for the sequencer to finish

0x5D - read

Read status of write sequencer and wait until the

WSEQ_BUSY,bit0,=0 which indicates that the DAC

playback path has been configured. Then continue.

0x1A - write

0x01FC

Enable the Speaker PGAs, SPKL_PGA and SPKR_PGA

0x33 - write

0x0001

Program the CLASSD_ACGAIN to x1.5

0x31 - write

0x00C0

Enable the speakers SPKR_ENA and SPKL_ENA

0x28 - write

0x0079

Set the left speaker volume SPKLVOL to 0dB (which

defaults to mute), change on zero cross only

0x29 - write

0x0079

Set the right speaker volume SPKRVOL to 0dB (which

defaults to mute), change on zero cross only

0x29 - write

0x0179

Update speaker volume SPKVU

Table 69 Register Settings for DAC to Speaker and headphone Outputs

The above configuration enables the speaker and the headphone outputs.

SWITCHING BETWEEN HEADPHONE AND SPEAKERS

With DAC to speaker and headphone playback enabled, switching between headphone and speaker

outputs should be done using the PGA and mute bits as shown in Table 70 and Table 71. This

achieves best pop-click performance.

To save power, it may also be desirable to apply power management settings in addition to the

settings shown, however note that disabled PGAs leave a resistive path hence do not achieve the

published mute attenuation specifications.

0x02 - write

0x012F

Headphone L mute

0x03 - write

0x012F

Headphone R mute

0x28 - write

0x0079

Set the left speaker volume SPKRVOL to 0dB

0x29 - write

0x0179

Set the right speaker volume to 0dB and update speaker

volume SPKVU

Table 70 Switching from Headphone playback to Speaker Playback

WM8961 Datasheet(PDF) 112 Page - Wolfson Microelectronics plc

WM8961 Datasheet(HTML) 112 Page - Wolfson Microelectronics plc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL