WM8731 datasheet(41/56 Pages) WOLFSON

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WM8731

Advanced Information

WOLFSON MICROELECTRONICS LTD

AI Rev 2.0 February 2001

The exact sample rates supported for all combinations are defined by the relationships in Table 21

below.

ACTUAL SAMPLING RATE

TARGET

SAMPLING

RATE

BOSR=0

( 250fs)

BOSR=1

(272fs)

kHz

8.021

12MHz/(250 x 48/8)

12MHz/(272 x 11/2)

12MHz/(250 x 48/32)

not available

44.117

44.1

not available

12MHz/272

12MHz/250

not available

88.235

88.2

not available

12MHz/136

12MHz/125

not available

Table 21 USB Mode Actual Sample Rates

ACTIVATING DSP AND DIGITAL AUDIO INTERFACE

To prevent any communication problems from arising across the Digital Audio Interface the Audio

Interface is disabled (tristate with weak 100k pulldown). Once the Audio Interface and the Sampling

Control has been programmed it is activated by setting the ACTIVE bit under Software Control.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0001001

Active Control

ACTIVE

Activate Interface

1 = Active

0 = Inactive

Table 22 Activating DSP and Digital Audio Interface

It is recommended that between changing any content of Digital Audio Interface or Sampling Control

SOFTWARE CONTROL INTERFACE

The software control interface may be operated using either a 3-wire (SPI-compatible) or 2-wire MPU

interface. Selection of interface format is achieved by setting the state of the MODE pin.

In 3-wire mode, SDIN is used for the program data, SCLK is used to clock in the program data and

CSB is used to latch in the program data. In 2-wire mode, SDIN is used for serial data and SCLK is

used for the serial clock. In 2-wire mode, the state of CSB pin allows the user to select one of two

addresses.

SELECTION OF SERIAL CONTROL MODE

The serial control interface may be selected to operate in either 2 or 3-wire modes. This is achieved

by setting the state of the MODE pin.

MODE

INTERFACE

FORMAT

02 wire

13 wire

Table 23 Control Interface Mode Selection

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