WM8956 datasheet(32/80 Pages) WOLFSON

32 / 80 page

WM8956

Preliminary Technical Data

PTD, July 2007, Rev 2.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R38 (26h)

Mono Out Mix

(1)

L2MO

Left Output Mixer to Mono Output Mixer

Control

0 = Left channel mix disabled

1 = Left channel mix enabled

R39 (27h)

Mono Out Mix

(2)

R2MO

Right Output Mixer to Mono Output

Mixer Control

0 = Right channel mix disabled

1 = Right channel mix enabled

R42 (2Ah)

Mono Out

Volume

MOUTVOL

Mono Output Mixer Volume Control

0 = 0dB

1 = -6dB

Table 17 Output Mixer Enable Control

When left and right inputs to the mono mixer are both disabled, the mono mixer will output VMID.

ANALOGUE OUTPUTS

HP_L AND HP_R OUTPUTS

The HP_L and HP_R pins can drive a 16

Ω or 32Ω headphone or a line output (see Headphone

Output and Line Output sections, respectively). The signal volume on HP_L and HP_R can be

independently adjusted under software control by writing to LOUT1VOL and ROUT1VOL,

respectively. Note that gains over 0dB may cause clipping if the signal is large. Any gain setting

below 0101111 (minimum) mutes the output driver. The corresponding output pin remains at the

same DC level (the reference voltage on the VREF pin), so that no click noise is produced when

muting or un-muting.

A zero cross detect on the analogue output may also be enabled when changing the gain setting to

minimize audible clicks and zipper noise as the gain updates. If zero cross is enabled a timeout is

also available to update the gain if a zero cross does not occur. This function may be enabled by

setting TOEN in register R23 (17h). The timeout period is set by TOCLKSEL. Note that SYSCLK

must be enabled to use this function.

WM8956 Datasheet(PDF) 32 Page - Wolfson Microelectronics plc

WM8956 Datasheet(HTML) 32 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

Datasheet Download

Link URL