wm8961 Wolfson Microelectronics plc, wm8961 Datasheet - Page 54

• Manufacturer Part Number: wm8961
• Description: Ultra-low Power Stereo Codec With 1w Stereo Class D Speaker Drivers And Ground Referenced Headphone Drivers
• Manufacturer: Wolfson Microelectronics plc

w
WM8961
Figure 27 DC Servo Block Diagram
Table 37 DC Servo Enable and Start-up Configuration
Note:
1. The “startup” bits are automatically reset to ‘0’ after 1 clock cycle.
DC Servo 1
DC Servo 1
REGISTER
ADDRESS
R60 (3Ch)
R61 (3Dh)
BIT
7
6
3
2
7
6
3
2
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
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.
DCS_TRIG_STARTUP_HPR
DCS_TRIG_STARTUP_HPL
DCS_TRIG_STARTUP_INR
DCS_TRIG_STARTUP_INL
DCS_ENA_CHAN_HPR
DCS_ENA_CHAN_HPL
DCS_ENA_CHAN_INR
DCS_ENA_CHAN_INL
1.
2.
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
DCS_TRIG_STARTUP_HPR (The HP_L, INR/L have similar start up sequence enables).
LABEL
a
start
up
DEFAULT
sequence
0
0
0
0
0
0
0
0
DC Servo enabled on channel INL
Perform startup sequence on channel INL*see note
1
DC Servo enabled on channel INR
Perform startup sequence on channel INR *see
note 1
DC Servo enabled on channel HPL
Perform startup sequence on channel HPL *see
note 1
DC Servo enabled on channel HPR
Perform startup sequence on channel HPR *see
note 1
for
the
HP_R
DESCRIPTION
by
PP, August 2009, Rev 3.1
configuring
Pre-Production
R61[2]
54