wm8918 Wolfson Microelectronics plc, wm8918 Datasheet - Page 118
wm8918
Manufacturer Part Number
wm8918
Description
Ultra Low Power Dac For Portable Audio Applications
Manufacturer
Wolfson Microelectronics plc
Datasheet
1.WM8918.pdf
(175 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
wm8918CGEFL/RV
Manufacturer:
WOLFSON
Quantity:
20 000
Part Number:
wm8918GEFL
Manufacturer:
WOLFSON
Quantity:
20 000
Company:
Part Number:
wm8918GEFL/RV
Manufacturer:
MOLEX
Quantity:
12 000
- Current page: 118 of 175
- Download datasheet (2Mb)
WM8918
w
Table 79 Write Sequencer Control - Programming a Sequence
Note that a ‘Dummy’ write can be inserted into a control sequence by commanding the sequencer to
write a value of 0 to bit 0 of Register R255 (FFh). This is effectively a write to a non-existent register
location. This can be used in order to create placeholders ready for easy adaptation of the sequence.
For example, a sequence could be defined to power-up a mono signal path from DACL to
headphone, with a ‘dummy’ write included to leave space for easy modification to a stereo signal
path configuration. Dummy writes can also be used in order to implement additional time delays
between register writes. Dummy writes are included in the default start-up sequence – see Table 81.
In summary, the Control Register to be written is set by the WSEQ_ADDR field. The data bits that
are written are determined by a combination of WSEQ_DATA_START, WSEQ_DATA_WIDTH and
WSEQ_DATA. This is illustrated below for an example case of writing to the VMID_RES field within
Register R5 (05h).
In this example, the Start Position is bit 01 (WSEQ_DATA_START = 0001b) and the Data width is 2
bits (WSEQ_DATA_WIDTH = 0001b). With these settings, the Control Write Sequencer would
updated the Control Register R5 [2:1] with the contents of WSEQ_DATA [1:0].
Figure 68 Control Write Sequencer Example
R110 (6Eh)
Write
Sequencer
2
REGISTER
ADDRESS
11:8
BIT
7:0
14
WSEQ_DELAY
WSEQ_DATA
WSEQ_EOS
LABEL
[3:0]
[7:0]
0000_0000
DEFAULT
0000
0
End of Sequence flag. This bit
indicates whether the Control Write
Sequencer should stop after executing
this step.
0 = Not end of sequence
1 = End of sequence (Stop the
sequencer after this step).
Time delay after executing this step.
Total delay time per step (including
execution)=
62.5μs × (2^WSEQ_DELAY + 8)
Data to be written in this sequence
step. When the data width is less than
8 bits, then one or more of the MSBs
of WSEQ_DATA are ignored. It is
recommended that unused bits be set
to 0.
PD, Rev 4.0, September 2010
DESCRIPTION
Production Data
118
Related parts for wm8918
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
24-bit, 192khz 6-channel Dac With Volume Control
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
24-bit, 192khz 6-channel Dac
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
HI FI AND TELEPHONY DUAL CODEC
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
Stereo Codec Portable Audio Applications
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
Stereo Codec For Portable Audio Applications
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
Multichannel Codec With S/pdif Transceiver
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
Ac97 Audio Codec Mixer With Integrated Headphone Driver
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
Part Number:
Description:
Ac-link Interface Audio Dac
Manufacturer:
Wolfson Microelectronics plc
Datasheet: