WM8961 datasheet(49/116 Pages) WOLFSON

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WM8961

Pre-Production

PP, August 2009, Rev 3.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R40 (28h)

Left Speaker

Volume

6:0

SPKLVOL

[6:0]

0000000

(MUTE)

SPK_LP/SPK_LN Volume

1111111 = +6dB

… 1dB steps down to

0110000 = -73dB

0101111 to 0000000 = Analogue MUTE

SPKLZC

Left Speaker Zero Cross Enable

1 = Change gain on zero cross only

0 = Change gain immediately

SPKVU

Speaker Volume Update

0 = Store SPKLVOL in intermediate

latch (no gain change)

1 = Update left and right channel gains

(left = SPKLVOL, right = intermediate

latch)

R41 (29h)

Right Speaker

Volume

6:0

SPKRVOL

[6:0]

0000000

(MUTE)

SPK_RP/SPK_RN Volume

1111111 = +6dB

… 1dB steps down to

0110000 = -73dB

0101111 to 0000000 = Analogue MUTE

SPKRZC

Right Speaker Zero Cross Enable

1 = Change gain on zero cross only

0 = Change gain immediately

SPKVU

Speaker Volume Update

0 = Store SPKRVOL in intermediate

latch (no gain change)

1 = Update left and right channel gains

(left = intermediate latch, right =

SPKRVOL)

R26 (1Ah)

Pwr Mgmt (2)

SPKL_PGA

SPK_LP and SPK_LN left speaker PGA

Enable

SPKR_PGA

SPK_RP and SPK_RN right speaker

PGA Enable

Table 34 SPK_L/SPK_R Analogue Volume Control

SPEAKER OUTPUT BOOST CONTROL

The speaker output boost stage allows AVDD to be run at a lower voltage to save power, while

maximum output power can be delivered to the load, maximising the full range of SPKVDD1 and

SPKVDD2 supplies. It is controlled by CLASSD_ACGAIN[2:0].

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R51 (33h)

Class D

Control 2

2:0

CLASSD_A

CGAIN

[2:0]

011

(1.68x)

AC Speaker Boost (Boosts speaker AC

output signal by up to 3.98 x on left and

right channels)

000 = 1.00x boost (+0dB)

001 = 1.19x boost (+1.5dB)

010 = 1.41x boost (+3.0dB)

011 = 1.68x boost (+4.5dB)

100 = 2.00x boost (+6.0dB)

101 = 2.37x boost (+7.5dB)

110 = 2.81x boost (+9.0dB)

111 = 3.98x boost (+12dB)

Note that +12dB setting will cause a full

scale output signal to clip.

Table 35 SPK_L/SPK_R Speaker Boost Control

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