wm9090 Wolfson Microelectronics plc, wm9090 Datasheet - Page 48

• Manufacturer Part Number: wm9090
• Description: Ultra Low Power Audio Subsystem
• Manufacturer: Wolfson Microelectronics plc

WM9090
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Table 29 DC Servo Active Modes
DC SERVO READBACK
The current DC offset value for each Headphone output channel can be read from Registers R89 and
R90, as described in Table 30. Note that these values may form the basis of settings that are
subsequently used by the DC Servo in DAC Write mode.
Table 30 DC Servo Readback
R85 (55h)
DC Servo 1
R89 (59h)
DC Servo
Readback 1
R90 (5Ah)
DC Servo
Readback 2
REGISTER
REGISTER
ADDRESS
ADDRESS
11:5
BIT
3:0
BIT
7:0
7:0
12
9
8
DCS_TRIG_SINGLE
_0
DCS_TRIG_SERIES
_1
DCS_TRIG_SERIES
_0
DCS_SERIES_NO_
01 [6:0]
DCS_TIMER_PERI
OD_01 [3:0]
DCS_DAC_WR_VA
L_1_RD
DCS_DAC_WR_VA
L_0_RD
LABEL
LABEL
0000 0000
0000 0000
DEFAULT
DEFAULT
010 1010
1010
0
0
0
Writing 1 to this bit selects a
single DC offset correction for
HPOUT1R.
In readback, a value of 1
indicates that the DC Servo
single correction is in progress.
Writing 1 to this bit selects a
series of DC offset corrections
for HPOUT1L.
In readback, a value of 1
indicates that the DC Servo DAC
Write correction is in progress.
Writing 1 to this bit selects a
series of DC offset corrections
for HPOUT1R.
In readback, a value of 1
indicates that the DC Servo DAC
Write correction is in progress.
Number of DC Servo updates to
perform in a series event.
0 = 1 updates
1 = 2 updates
...
127 = 128 updates
Time between periodic updates.
Time is calculated as
0.256s x (2^PERIOD)
0000 = Off
0001 = 0.52s
1010 = 266s (4min 26s)
1111 = 8519s (2hr 22s)
Readback value for HPOUT1L.
Two’s complement format.
LSB is 0.25mV.
Range is +/-32mV
Readback value for HPOUT1R.
Two’s complement format.
LSB is 0.25mV.
Range is +/-32mV
PP, January 2010, Rev 3.0
DESCRIPTION
DESCRIPTION
Pre-Production
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