WM8976 datasheet(67/83 Pages) WOLFSON

67 / 83 page

Preliminary Technical Data

WM8976

PTD Rev 2.0 February 2005

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 both enables.

If jack detection is not enabled, the output enables default to all 1’s, allowing the outputs to be

controlled as normal via the normal output enables found in table 37, 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 = Reserved

11 = Reserved

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 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

R13

7:4

JD_EN1

Output enables 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 56 Jack Detect Register Control Bits

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