WM9705SEFTSLASHV datasheet(37/55 Pages) WOLFSON

37 / 55 page

WM9705

Production Data

PD Rev 4.4 August 2006

CONTROL

BIT

FUNCTION

AMUTE

Indicates automute has been detected in the audio DAC (all ‘0’ data) – read only

HSCP

Headset detect comparator output – read only

MPUEN

Mic pull up enable

MHPZ

Mono headphone tristate enable

PSEL

PHONE to MONO path switch enable

HSDT

Overrides Headset detect comparator, forcing left headphone amp to tristate

HSEN

Headset auto-detect enable

HPND

Headphone with no DAC enable

AMEN

Automute enable bit

2S data output enable

ADCNDAC

ADC no DAC path enable

ADCO

ADC to SPDIF and/or I

2S output

HPF

ADC high pass filter disable;

HSCMP

Headset comparator enable bit

ASS1

ADC slot map control

ASS0

ADC slot map control

Table 21 Vendor Specific Control Register 5Ch

AMUTE indicates automute state has been detected. This is a read-only bit. 1 = automute

detected.

HSCP is a read only bit, indicating headset detected. It is the output from the headset autodetect

comparator. 0 = headset detected.

MPUEN enables a 5mA (typ) pull up current on the MIC1 input pin, which when a headset

microphone of high impedance is plugged in, causes the MIC1 pin to pull up to above Vmid, and

be detected. 1 = enable.

MHPZ tristates the MONO headphone driver output buffer. 1 = tristate.

PSEL enables the switch from PHONE input to MONO output; see block diagram. 1 = enable.

HSEN enables headset auto-detect function. HSCMP enables the headset detect comparator. 1 =

enable.

HSDT overrides the headset auto-detect comparator, forcing the left headphone output to tristate

and the HPLOUTL pin to be used as a headset microphone input path to the mic1 preamplifier

input. 1 = autodetect comparator override.

HPND enables the switch which outputs only the analog mixer output to the HPHONE outputs,

without the DAC signal being summed in. See block diagram. 1 = enable.

AMEN enables the DAC automute function, which detects zero data on both dac channels and

auto-mutes the outputs under this condition. 1 = enable.

Bit I

2S enables I2S output, sending an LRCLK to the MASK/LRC pin (pin 43) and I2S data to the

SPEN/I

2S pin (pin 44). BITCLK is used to clock out the data. Only 48ks/s data is supported. 1 =

enable.

ADCNDAC selects input to the ADC from before the point where the DAC signal is summed in. 1

= select.

Bit ADCO is used to select data from the internal ADCs to be output as SPDIF or I

2S data on

these pins rather than the data from the selected AC link slot. 1 = select.

HPF turns off the digital high pass filter in the ADC output when set to ‘1’.

ASS1, ASS0 are ADC slot mapping control bits. See table below. Default is slots 3 and 4.

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