WM9093ECSSLASHR datasheet(27/84 Pages) WOLFSON

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Production Data

WM9093

PD, March 2012, Rev 4.2

HEADPHONE OUTPUT VOLUME CONTROL

The headphone output PGA controls are shown in Table 10.

The HPOUT1_VU bits control the loading of the headphone PGA volume data. When HPOUT1_VU is

set to 0, the volume control data will be loaded into the respective control register, but will not actually

change the gain setting. The headphone PGA volume settings are both updated when a 1 is written to

either HPOUT1_VU bit. This makes it possible to update the gain of the left and right output paths

simultaneously.

A zero-cross function is provided on the headphone output PGAs. Note that the timeout clock TOCLK

must be enabled when using the zero-cross function. See “Clocking Control” for more information on

the TOCLK control fields.

When the zero-cross function is enabled (using HPOUT1L_ZC or HPOUT1R_ZC), it will only become

effective after the respective PGA gain (or mute) has been changed in two or more subsequent

To guarantee zero cross functionality, it is recommended to enable zero cross and toggle the

respective mute (HPOUT1L_MUTE or HPOUT1R_MUTE) before enabling the headphone output.

Alternatively, the zero-cross function can be ensured by updating the PGA gain register

(HPOUT1L_VOL or HPOUT1R_VOL) in two successive register writes - decrementing then

incrementing the setting by 1 gain step – after the zero-cross enable bits have been set.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R28 (1Ch)

Left Output

Volume

HPOUT1_VU

N/A

Headphone Output PGA Volume

Update

Writing a 1 to this bit will update

HPOUT1LVOL and HPOUT1RVOL

volumes simultaneously.

HPOUT1L_ZC

Left Headphone Output PGA Zero

Cross Control

0 = Change gain immediately

1 = Change gain on zero cross only

HPOUT1L_MUTE

Left Headphone Output PGA Mute

0 = Un-mute

1 = Mute

5:0

HPOUT1L_VOL [5:0]

2Dh

(-12dB)

Left Headphone Output PGA

Volume

-57dB to +6dB in 1dB steps

(See Table 11 for output PGA

volume control range)

R29 (1Dh)

Right Output

Volume

HPOUT1_VU

N/A

Headphone Output PGA Volume

Update

Writing a 1 to this bit will update

HPOUT1LVOL and HPOUT1RVOL

volumes simultaneously.

HPOUT1R_ZC

Right Headphone Output PGA Zero

Cross Control

0 = Change gain immediately

1 = Change gain on zero cross only

HPOUT1R_MUTE

Right Headphone Output PGA Mute

0 = Un-mute

1 = Mute

5:0

HPOUT1R_VOL [5:0]

2Dh

(-12dB)

Right Headphone Output PGA

Volume

-57dB to +6dB in 1dB steps

(See Table 11 for output PGA

volume control range)

Table 10 Headphone Output PGA Control

WM9093ECS/R Datasheet(PDF) 27 Page - Wolfson Microelectronics plc

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