WM8351 datasheet(38/330 Pages) WOLFSON

38 / 330 page

WM8351

Production Data

PD, April 2012, Rev 4.5

11 CONTROL INTERFACE

11.1 GENERAL DESCRIPTION

The WM8351 is controlled by writing to its control registers. Readback is available for most registers.

Most aspects of the WM8351 operation can be controlled via this interface. The control interface can

operate as either a 2-, 3- or 4-wire control interface:

2-wire mode uses pins SCLK and SDATA.

3-wire mode uses pins CSB, SCLK and SDATA.

4-wire mode uses pins CSB, SCLK, SDATA and SDOUT.

GPIO7 is automatically enabled as CSB in 3-wire and 4-wire control modes. GPIO6 is automatically

enabled as SDOUT in 4-wire control mode. Register readback is provided on the bi-directional pin

SDATA in 2-/3-wire modes and on SDOUT (GPIO6) in 4-wire mode.

In 2-wire mode, the control interface supports single register access as well as multiple access with or

without address auto-increment.

In Development Mode (see Section 14.4), the WM8351 initially selects the secondary 2-wire control

interface, using pins GPIO10 and GPIO11. This enables configuration of the WM8351 via a separate

interface prior to selecting the normal system operation. Note that, in Custom modes, the secondary

interface is not supported.

11.2 CONTROL INTERFACE MODES

The WM8351 control interface can be configured for 2-, 3- or 4-wire operation using the following

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R6 (06h)

Interface

Control

SPI_CFG

Controls the SDOUT (GPIO6) pin operation in 4

wire mode

0 = SDOUT output is CMOS

1 = SDOUT output is open drain

Note: SPI_4WIRE must be set for this to take

effect.

SPI_4WIRE

Selects 3-wire or 4-wire SPI mode

0 = 3 wire mode using bi-directional SDATA pin

1 = 4 wire mode using SDOUT (GPIO6)

Note: SPI_3WIRE must be set for this to take

effect.

SPI_3WIRE

Selects 2- or 3-/4-wire mode.

0 = 2-wire mode

1 = 3-/4-wire mode

Table 1 Control Interface Modes

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