WM8978 Wolfson Microelectronics Ltd., WM8978 Datasheet - Page 76

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WM8978

Manufacturer Part Number
WM8978
Description
The WM8978 is a low power, high quality stereo codec designed for portable applications such as Digital still camera or Digital Camcorde
Manufacturer
Wolfson Microelectronics Ltd.
Datasheet

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WM8978
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Table 58 Jack Detect Register Control Bits
The VMID_EN signal has an OR function performed with the normal VMID driver enable. If the
VMID_EN signal is to have no effect to normal functionality when jack detection is enabled, it should
set to 0 for all JD_EN0 or JD_EN1 settings.
If jack detection is not enabled (JD_EN=0), the output enables default to all 1’s, allowing the outputs
to be controlled as normal via the normal output enables found in Table 45. Similarly the VMID_EN
signal defaults to 0 allowing the VMID driver to be controlled via the normal enable bit.
R9
GPIO Control
R13
GPW Control
REGISTER
ADDRESS
5:4
6
8:7
3:0
7:4
BIT
JD_SEL
JD_EN
JD_VMID
JD_EN0
JD_EN1
LABEL
00
0
00
0
0
DEFAULT
Pin selected as jack detection input
00 = GPIO1
01 = GPIO2
10 = GPIO3
11 = Reserved
Jack Detection Enable
0=disabled
1=enabled
[7] VMID_EN_0
[8] VMID_EN_1
Output enabled when selected jack
detection input is logic 0.
[0]= OUT1_EN_0
[1]= OUT2_EN_0
[2]= OUT3_EN_0
[3]= OUT4_EN_0
Output enabled when selected jack
detection input is logic 1
[4]= OUT1_EN_1
[5]= OUT2_EN_1
[6]= OUT3_EN_1
[7]= OUT4_EN_1
PTD Rev 2.6 November 2005
DESCRIPTION
Preliminary Technical Data
76