WM9090 Datasheet, PDF (51/81 Pages) Wolfson Microelectronics plc – Ultra Low Power Audio Subsystem

Production Data
WM9090
REGISTER
ADDRESS
BIT
LABEL
8
DCS_TRIG_SERIES
_0
R85 (55h)
DC Servo 1
11:5 DCS_SERIES_NO_
01 [6:0]
3:0 DCS_TIMER_PERI
OD_01 [3:0]
Table 29 DC Servo Active Modes
DEFAULT
0
010 1010
1010
DESCRIPTION
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.
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)
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.
REGISTER
ADDRESS
R89 (59h)
DC Servo
Readback 1
BIT
LABEL
7:0 DCS_DAC_WR_VA
L_1_RD
R90 (5Ah)
DC Servo
Readback 2
7:0 DCS_DAC_WR_VA
L_0_RD
Table 30 DC Servo Readback
DEFAULT
DESCRIPTION
0000 0000
0000 0000
Readback value for HPOUT1R.
Two’s complement format.
LSB is 0.25mV.
Range is -32mV to +31.75mV
Readback value for HPOUT1L.
Two’s complement format.
LSB is 0.25mV.
Range is -32mV to +31.75mV
w
PD, November 2010, Rev 4.1
51