WM8980 datasheet(65/81 Pages) WOLFSON

65 / 81 page

Product Preview

WM8980

PP Rev 1.6 January 2005

Similar to the output enables, VMID, which can be driven out of OUT3 can be configured to be on/off

depending on the jack detection input polarity using the VMID_EN_0 and VMID_EN_1 bits.

The jack detection enables work as follows:

All OUT_EN signals have an AND function performed with their normal enable signals (in Table 40).

When an output is normally enabled at per Table 40, 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 on 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 40. Similarly the VMID_EN

signal defaults to 0 allowing the VMID driver to be controlled via the normal enable bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

5:4

JD_SEL

Pin selected as jack detection input

00 = GPIO1

01 = GPIO2

10 = GPIO3

11 = GPIO4

JD_EN

Jack Detection Enable

0=disabled

1=enabled

GPIO Control

8:7

JD_VMID

[7] VMID_EN_0

[8] VMID_EN_1

3:0

JD_EN0

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

R13

GPW Control

7:4

JD_EN1

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

Table 54 Jack Detect Register Control Bits

WM8980 датащи(PDF) 65 Page - Wolfson Microelectronics plc

WM8980 датащи(HTML) 65 Page - Wolfson Microelectronics plc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81

датащи скачать

ссылки URL