WM8955BLGECOSLASHV datasheet(25/44 Pages) WOLFSON

25 / 44 page

Production Data

WM8955BL

PD Rev 4.1 February 2007

LOUT2/ROUT2 OUTPUTS

The LOUT2 and ROUT2 output pins are essentially similar to LOUT1 and ROUT1, but they are

independently controlled and can drive an 32

Ω BTL earpiece. For BTL drive, the ROUT2 signal must

be inverted (ROUT2INV = 1), so that the left and right channel are mixed to mono in the earpiece [L-(-

R) = L+R].

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

6:0

LOUT2VOL

1111001

(0dB)

similar to LOUT1VOL

LO2ZC

Left zero cross enable

1 = Change gain on zero cross only

0 = Change gain immediately

R40 (28h)

LOUT2

Volume

LO2VU

similar to LO1VU

6:0

ROUT2VOL

1111001

(0dB)

similar to ROUT1VOL

RO2ZC

Right zero cross enable

1 = Change gain on zero cross only

0 = Change gain immediately

R41 (29h)

ROUT2

Volume

RO2VU

similar to RO1VU

R23 (17h)

TOEN

as for LOUT1 / ROUT1

R24 (18h)

Additional (2)

ROUT2INV

ROUT2 Invert

0 = No Inversion (0

° phase shift)

1 = Signal inverted (180

° phase shift)

Table 15 LOUT2/ROUT2 Control

MONO OUTPUT

The MONOOUT pin can drive a mono line output. The signal volume on MONOOUT can be adjusted

under software control by writing to MONOOUTVOL.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

6:0

MONOOUT

VOL

1111001

(0dB)

MONOOUT Volume

1111111 = +6dB

… (80 steps)

0110000 = -67dB

0101111 to 0000000 = Analogue MUTE

R42 (2Ah)

MONOOUT

Volume

MOZC

MONOOUT zero cross enable

1 = Change gain on zero cross only

0 = Change gain immediately

R23 (17h)

TOEN

as for LOUT1 / ROUT1

Table 16 MONOOUT Volume Control

OUT3 OUTPUT

The OUT3 pin can drive a 16

Ω or 32Ω headphone or a line output or be used as a DC reference for a

headphone output. It can be selected to either drive out an inverted ROUT1 or inverted MONOOUT

for e.g. an earpiece drive between OUT3 and LOUT1 or differential output between OUT3 and

MONOOUT.

OUT3SW selects the mode of operation required.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R24 (18h)

Additional (2)

8:7

OUT3SW

OUT3 select

00 : VREF

01 : ROUT1

10 : MONOOUT

11 : right mixer output

Table 17 OUT3 Select

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