WM8985GEFLSLASHR datasheet(86/121 Pages) WOLFSON

86 / 121 page

WM8985

Production Data

PD, Rev 4.6, July 2009

GENERAL PURPOSE INPUT/OUTPUT

The WM8985 has three dual purpose input/output pins.

•

CSB/GPIO1: CSB / GPIO1 pin

•

L2/GPIO2: Left channel line input / headphone detection input

•

R2/GPIO3: Right channel line input / headphone detection input

The GPIO2 and GPIO3 functions are provided for use as jack detection inputs.

The GPIO1 function is provided for use as jack detection input or general purpose output.

The default configuration for the CSB/GPIO1 is to be an input.

When setup as an input, the CSB/GPIO1 pin can either be used as CSB or for jack detection,

depending on how the MODE pin is set.

Table 45 illustrates the functionality of the GPIO1 pin when used as a general purpose output.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R8 (08h)

GPIO

Control

2:0

GPIO1SEL

000

CSB/GPIO1 pin function select:

000 = input (CSB / Jack detection:

depending on MODE setting)

001 = reserved

010 = Temp ok

011 = Amute active

100 = PLL clk output

101 = PLL lock

110 = logic 0

111 = logic 1

GPIO1POL

GPIO1 Polarity invert

0 = Non inverted

1 = Inverted

GPIO1GPD

GPIO1 Internal pull-down enable:

0 = Internal pull-down disabled

1 = Internal pull-down enabled

GPIO1GPU

GPIO1 Internal pull-up enable:

0 = Internal pull-up disabled

1 = Internal pull-up enabled

GPIO1GP

GPIO1 Open drain enable

0 = Open drain disabled

1 = Open drain enabled

R14(0Eh)

5:4

OPCLKDIV

PLL Output clock division ratio

00 = divide by 1

01 = divide by 2

10 = divide by 3

11 = divide by 4

Table 45 CSB/GPIO Control

Note:

If MODE is set to 3 wire mode, CSB/GPIO1 is used as CSB input irrespective of the GPIO1SEL[2:0]

bits.

also the highpass filter cut-off in applications mode (HPFCUT). OPCLKDIV and HPFCUT cannot be

set independently.

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