WM8961GEFLSLASHV datasheet(54/116 Pages) WOLFSON

54 / 116 page

WM8961

Pre-Production

PP, August 2009, Rev 3.1

Figure 27 DC Servo Block Diagram

DC SERVO STARTUP OPERATION

The DC servo contains automatic control circuitry and can be configured using individual register

writes.

The DC servo can also be configured by starting a sequence using the control write sequencer (see

“Control Write Sequencer” section). Starting the pre-defined sequence from line 0 of the control write

sequencer configures the DC servo by default.

The basic startup operation of the DC servo, for example for HP_R, is to

Enable the DC Servo operation on the HP_R output by configuring R61[3],

DCS_ENA_CHAN_HPR. (The HP_L, INR/L have similar enables).

Trigger

start

sequence

for

the

HP_R

configuring

R61[2]

DCS_TRIG_STARTUP_HPR (The HP_L, INR/L have similar start up sequence enables).

Additionally, to enable the DC servo for L/RINPUT, the headphone charge pump must be enabled

(CP_ENA = 1) and MCLK must be applied.

Note that it is recommended to perform a calibration of the DC Servo input channel before using the

Input PGA Zero Cross Detector.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R60 (3Ch)

DC Servo 1

DCS_ENA_CHAN_INL

DC Servo enabled on channel INL

DCS_TRIG_STARTUP_INL

Perform startup sequence on channel INL*see note

DCS_ENA_CHAN_INR

DC Servo enabled on channel INR

DCS_TRIG_STARTUP_INR

Perform startup sequence on channel INR *see

note 1

R61 (3Dh)

DC Servo 1

DCS_ENA_CHAN_HPL

DC Servo enabled on channel HPL

DCS_TRIG_STARTUP_HPL

Perform startup sequence on channel HPL *see

note 1

DCS_ENA_CHAN_HPR

DC Servo enabled on channel HPR

DCS_TRIG_STARTUP_HPR

Perform startup sequence on channel HPR *see

note 1

Table 37 DC Servo Enable and Start-up Configuration

Note:

1. The “startup” bits are automatically reset to ‘0’ after 1 clock cycle.

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