wm8982gefl-v Wolfson Microelectronics plc, wm8982gefl-v Datasheet - Page 73

• Manufacturer Part Number: wm8982gefl-v
• Description: Mono Codec With Speaker Driver And Video Buffer
• Manufacturer: Wolfson Microelectronics plc

Pre-Production
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Notes:
The SLOWCLKEN bit must be enabled for the jack detect circuitry to operate.
The GPIOPOL bit is not relevant for jack detection, it is the signal detected at the pin which is used
Switching on/off of the outputs is fully configurable by the user. Each output, OUT1, OUT2, OUT3
and OUT4 has 2 associated enables. OUT1_EN_0, OUT2_EN_0, OUT3_EN_0 and OUT4_EN_0 are
the output enable signals which are used if the selected jack detection pin is at logic 0 (after de-
bounce). OUT1_EN_1, OUT2_EN_1, OUT3_EN_1 and OUT4_EN_1 are the output enable signals
which are used if the selected jack detection pin is at logic 1 (after de-bounce).
The jack detection enables operate as follows:
All OUT_EN signals have an AND function performed with their normal enable signals (in Table 46).
When an output is normally enabled at per Table 46 the selected jack detection enable (controlled by
selected jack detection pin polarity) is set 0; it will turn the output off. If the normal enable signal is
already OFF (0), the jack detection signal will have no effect due to the AND function.
During jack detection if the user desires an output to be un-changed whether the jack is in or not,
both the JD_EN settings i.e. JD_EN0 and JD_EN1, should be set to 0000.
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 47.
Table 60 Jack Detect Register Control Bits
R9
GPIO control
R13
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
0000
0000
DEFAULT
Pin selected as jack detection input
00 = GPIO1
01 = GPIO2
10 = Reserved
11 = Reserved
Jack Detection Enable
0 = disabled
1 = enabled
[7] VMID_EN_0
[8] VMID_EN_1
Output enables 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 enables when selected jack
detection input is logic 1
0000-0011 = Reserved
[4]= OUT1_EN_1
[5]= OUT2_EN_1
[6]= OUT3_EN_1
[7]= OUT4_EN_1
PP, Rev 3.2, September 2008
DESCRIPTION
WM8982
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