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WM8281ECS/R Scheda tecnica(PDF) 205 Page - Cirrus Logic

Il numero della parte WM8281ECS/R
Spiegazioni elettronici  Low Power Audio System with Ambient Noise Cancellation and Echo Cancellation
PDF  392 Pages
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Produttore elettronici  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8281ECS/R Scheda tecnica(HTML) 205 Page - Cirrus Logic

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WM8281
Rev 4.0
205
REGISTER
ADDRESS
BIT
LABEL
DEFAUL
T
DESCRIPTION
R723
(02D3h)
Jack detect
analogue
0
JD1_ENA
0
JACKDET enable
0 = Disabled
1 = Enabled
R3413
(0D55h)
AOD IRQ
Raw Status
0
JD1_STS
0
JACKDET input status
0 = Jack not detected
1 = Jack is detected
(Assumes the JACKDET pin is
pulled ‘low’ on Jack insertion.)
R3414
(0D56h)
Jack detect
debounce
0
JD1_DB
0
JACKDET input de-bounce
0 = Disabled
1 = Enabled
Table 75 Jack Detect Control
A recommended connection circuit, including headphone output on HPOUT1 and microphone
connections, is shown in Figure 61.
See “Applications Information” for details of recommended
external components.
WM8281
HPOUT1L
HPOUT1R
HPOUT1FB1
JACKDET
MICDET1
Note: The illustrated circuit assumes
the jack insertion switch contacts are
closed when jack is inserted.
* Note that the Right analogue mic
channel is recommended with the
external accessory detect function
(jack insertion switch)
MICBIASn
2.2k
 (+/-2%)
C
* INnRP
Figure 61 Jack Detect and External Accessory Connections
The internal comparator circuit used to detect the JACKDET status is illustrated in Figure 62.
The threshold voltages for the jack detect circuit are noted in the “Electrical Characteristics”. Note that
separate thresholds are defined for jack insertion and jack removal.
JACKDET
+
-
reference
AVDD
Jack Detect logic
1M
(jack insertion switch)
Note: The illustrated circuit assumes the
jack insertion switch contacts are closed
when jack is inserted.
Figure 62 Jack Detect Comparator



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