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WM8593 bảng dữ liệu(PDF) 54 Page - Wolfson Microelectronics plc

tên linh kiện WM8593
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WM8593
Product Preview
w
PP Rev 1.0 January 2007
54
JACK DETECT
When using the WM8593 with headphones, a jack detect function is available using the GPIO pins.
The jack detect function is controlled using GPIO1_APP and GPIO2_APP. The polarity of the jack
detect signal can be inverted using JD_INV. When a jack is detected, the WM8593 will automatically
mute
PGAs
as
defined
by
JD_PGA1L_MUTE,
JD_PGA1R_MUTE,
JD_PGA2L_MUTE,
JD_PGA2R_MUTE, JD_PGA3L_MUTE and JD_PGA3R_MUTE.
See Application Information section for details of connections to the headphone jack.
Example: Mute speakers when headphone is inserted
Assume PGA1L is connected to VOUT1L, PGA1R is connected to VOUT1R and so on. VOUT1L
and VOUT1R are used to drive the speaker amplifier, and VOUT3L and VOUT3R are used to drive
headphones
directly.
Set
GPIO1_APP=1
to
enable
jack
detect
on
GPIO1,
then
set
JD_PGA1L_MUTE=1 and JD_PGA1R_MUTE=1 to mute PGA1L and PGA1R when a set of
headphones is inserted.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0
GPIO1_
APP
0
GPIO1 Application Select
0 = Use GPIO1 as data pin for audio
interface mux
1 = Use GPIO1 as input for jack detect
1
GPIO2_
APP
0
GPIO2 Application Select
0 = Use GPIO2 as data pin for audio
interface mux
1 = Use GPIO2 as input for jack detect
R27
GEN
1Bh
2
JD_INV
0
Jack Detect Polarity
0 = Normal (active low)
1 = Inverted (active high)
7
JD_
PGA1L_
MUTE
0
8
JD_
PGA1R_
MUTE
0
9
JD_
PGA2L_
MUTE
0
10
JD_
PGA2R_
MUTE
0
11
JD_
PGA3L_
MUTE
0
R26
PGA_CTRL2
1Ah
12
JD_
PGA3R_
MUTE
0
Jack Detect Mute Control
0 = Do not mute PGA when jack is detected
1 = Mute PGA when jack is detected
Table 43 Jack Detect Control



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