WM8993 datasheet(69/229 Pages) WOLFSON

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Production Data

WM8993

PD, November 2010, Rev 4.0

SEQUENCE

HEADPHONE ENABLE

Step 1

HPOUT1L_ENA = 1

HPOUT1R_ENA = 1

Step 2

μs delay

Step 3

HPOUT1L_DLY = 1

HPOUT1R_DLY = 1

Step 4

DC offset correction

Step 5

HPOUT1L_OUTP = 1

HPOUT1L_RMV_SHORT = 1

HPOUT1R_OUTP = 1

HPOUT1R_RMV_SHORT = 1

Table 39 Headphone Output Enable Sequence

SEQUENCE

HEADPHONE DISABLE

Step 1

HPOUT1L_RMV_SHORT = 0

HPOUT1L_DLY = 0

HPOUT1L_OUTP = 0

HPOUT1R_RMV_SHORT = 0

HPOUT1R_DLY = 0

HPOUT1R_OUTP = 0

Step 2

HPOUT1L_ENA = 0

HPOUT1R_ENA = 0

Table 40 Headphone Output Disable Sequence

The sequences described above in Table 39 and Table 40 are implemented automatically by the

WM8993 when the HPOUT1_AUTO_PU bit is set, which is the default condition. In this mode, the

enable sequence is triggered by setting the HPOUT1L_ENA and HPOUT1R_ENA bits in register R1.

Note that the Charge Pump is also enabled automatically in this mode.

The register bits relating to pop suppression control are defined in Table 41.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1 (01h)

Power

Management

(1)

HPOUT1L_ENA

Enables HPOUT1L input stage

0 = Disabled

1 = Enabled

For normal operation, this bit should

be set as the first step of the

HPOUT1L Enable sequence.

Note: When HPOUT1_AUTO_PU is

set, the HPOUT1L_ENA bit

automatically enables all stages of the

left headphone driver

HPOUT1R_ENA

Enables HPOUT1R input stage

0 = Disabled

1 = Enabled

For normal operation, this bit should

be set as the first step of the

HPOUT1R Enable sequence.

Note: When HPOUT1_AUTO_PU is

set, the HPOUT1R_ENA bit

automatically enables all stages of the

right headphone driver

WM8993 Datasheet(PDF) 69 Page - Wolfson Microelectronics plc

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