WM8731SEDSSLASHR datasheet(46/63 Pages) WOLFSON

46 / 63 page

WM8731 / WM8731L

Production Data

PD Rev 4.3 August 2006

Once the WM8731/L has acknowledged a correct address, the controller will send eight data bits

(bits B15-B8). WM8731/L will then acknowledge the sent data by pulling SDIN low for one clock

pulse. The controller will then send the remaining eight data bits (bits B7-B0) and the WM8731/L will

then acknowledge again by pulling SDIN low.

A stop condition is defined when there is a low to high transition on SDIN while SCLK is high. If a

start or stop condition is detected out of sequence at any point in the data transfer then the device

will jump to the idle condition.

After receiving a complete address and data sequence the WM8731/L returns to the idle state and

waits for another start condition. Each write to a register requires the complete sequence of start

condition, device address and R/W bit followed by the 16 register address and data bits.

POWER DOWN MODES

The WM8731/L contains power conservation modes in which various circuit blocks may be safely

powered down in order to conserve power. This is software programmable as shown in the table

below.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

LINEINPD

Line Input Power Down

1 = Enable Power Down

0 = Disable Power Down

MICPD

Microphone Input an Bias

Power Down

1 = Enable Power Down

0 = Disable Power Down

ADCPD

ADC Power Down

1 = Enable Power Down

0 = Disable Power Down

DACPD

DAC Power Down

1 = Enable Power Down

0 = Disable Power Down

OUTPD

Line Output Power Down

1 = Enable Power Down

0 = Disable Power Down

OSCPD

Oscillator Power Down

1 = Enable Power Down

0 = Disable Power Down

CLKOUTPD

CLKOUT power down

1 = Enable Power Down

0 = Disable Power Down

0000110

Power Down

Control

POWEROFF

Power Off Device

1 = Device Power Off

0 = Device Power On

Table 26 Power Conservation Modes Software Control

The power down control can be used to either a) permanently disable functions when not required in

certain applications or b) to dynamically power up and down functions depending on the operating

mode, e.g.: during playback or record. Please follow the special instructions below if dynamic

implementations are being used.

LINEINPD: Simultaneously powers down both the Line Inputs. This can be done dynamically without

any audible effects either on the ADC or to the Line Outputs in Bypass mode. This is of use when the

device enters Playback, Pause or Stop modes or the Microphone input has been selected.

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