WM8956CGEFLSLASHV datasheet(42/80 Pages) WOLFSON

42 / 80 page

WM8956

Production Data

PD, November 2011, Rev 4.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R9 (09h)

Audio

Interface (2)

ALRCGPIO

GPIO1 Pin Function Select

0 = GPIO1 pin disabled

1 = GPIO1 pin configured as GPIO

R48 (30h)

Additional

Control (4)

6:4

GPIOSEL

[2:0]

000

GPIO1 GPIO Function Select:

000 = Jack detect input

001 = Reserved

010 = Temperature ok

011 = Debounced jack detect output

100 = SYSCLK output

101 = PLL lock

110 = Logic 0

111 = Logic 1

GPIOPOL

GPIO Polarity Invert

0 = Non inverted

1 = Inverted

R52 (34h)

Clocking (2)

8:6

OPCLKDIV

[2:0]

000

SYSCLK Output to GPIO Clock Division

Ratio

000 = SYSCLK

001 = SYSCLK / 2

010 = SYSCLK / 3

011 = SYSCLK / 4

100 = SYSCLK / 5.5

101 = SYSCLK / 6

Table 26 GPIO Control

Slow clock must be enabled (TOEN = 1) when using the jack detect function. This slow clock is used

to debounce the jack detect input. The debounce period can be selected using TOCLKSEL.

The temperature sensor must be enabled for the "Temperature ok" GPIO output to function properly.

For further details of the Jack detect operation see the Headphone Switch section.

DIGITAL AUDIO INTERFACE

The digital audio interface is used for inputting DAC data into the WM8956. It uses three pins:



DACDAT: DAC data input



DACLRC: DAC data alignment clock



BCLK: Bit clock, for synchronisation

The clock signals BCLK and DACLRC can be outputs when the WM8956 operates as a master, or

inputs when it is a slave (see Master and Slave Mode Operation, below).

Four different audio data formats are supported:



Left justified



Right justified



DSP mode

All four of these modes are MSB first. They are described in Audio Data Formats, below. Refer to the

Electrical Characteristic section for timing information.

MASTER AND SLAVE MODE OPERATION

The WM8956 can be configured as either a master or slave mode device. As a master device the

WM8956 generates BCLK and DACLRC and thus controls sequencing of the data transfer on

DACDAT. In slave mode, the WM8956 responds with data to clocks it receives over the digital audio

interface. The mode can be selected by writing to the MS bit. Master and slave modes are illustrated

below.

WM8956CGEFL/V Datasheet(PDF) 42 Page - Wolfson Microelectronics plc

WM8956CGEFL/V Datasheet(HTML) 42 Page - Wolfson Microelectronics plc

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