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Data Sheet

ADAU1772

Rev. C | Page 45 of 116

MULTIPURPOSE PINS

The ADAU1772 has seven multipurpose (MP) pins that can be

used for serial data I/O, clock outputs, and control in a system

without a microcontroller. Each pin can be individually set to

either its default or MP setting. The functions include push-

button volume controls, enabling the compressors, parameter

bank switching, DSP bypass mode, and muting the outputs.

The function of each of these pins is set in Register 0x0038 to

Table 26. Multipurpose Pin Functions

Pin No.

Default Pin Function

Secondary Pin Functions

LRCLK

Multipurpose control inputs

BCLK

Multipurpose control inputs

DAC_SDATA

Multipurpose control inputs

MP1 acting as push-

button volume up

ADC_SDATA0, PDM output,

multipurpose control inputs

MP6 acting as push-

button volume down

ADC_SDATA1, CLKOUT,

multipurpose control inputs

DMIC2_3

Multipurpose control inputs

DMIC0_1

Multipurpose control inputs

PUSH-BUTTON VOLUME CONTROLS

The ADC and DAC volume controls can be set up to be controlled

with two push-buttons—one for volume up and one for volume

down. The volume setting can either be changed with a click of the

button or be ramped by holding the button. The volume settings

change when the signal on the pin from the button goes from

low to high.

When in push-button mode, the initial volume level is set with

Bits PB_VOL_INIT_VAL. By default, MP1 acts as the push-

button volume up and MP6 acts as the push-button volume

down; however, any of the MPx pins can be set to act as the

push-button up and push-button down volume controls.

When the ADC and/or DAC volumes are controlled with the

push-buttons, the corresponding volume control registers no

longer allow control of the volume from the control port.

Therefore, writing to these volume control registers has no

effect on the codec volume level.

LIMITER COMPRESSION ENABLE

This function allows a user to enable limiter compression

regardless of the signal level. Setting an MPx pin low when this

function is enabled causes the limiter to compress the incoming

signal by the minimum gain setting. When the MPx pin is released,

the limiter resumes normal behavior.

PARAMETER BANK SWITCHING

An MPx pin can be used to switch the active parameter bank

between Bank A and Bank B. When this setting is selected,

Bank A is active when the pin is high and Bank B is active when

the pin is low. Care should be taken to set the BANK_SL bits in

the CORE_CONTROL register (Address 0x0009) to the default

value of 0x00 before enabling MPx pin control over bank

switching. Simultaneous control of bank switching by both

Bit ZERO_STATE selects whether the data memory of the

codec is set to 0 during a bank switch. If the data is not set to 0

when a new set of filter coefficients is enabled via a bank switch,

there may be a pop in the audio as the old data is circulated in

the new filters.

MUTE

The MPx pins can be put into a mode to mute the ADCs or DACs.

When in this mode, mute is enabled when an MPx pin is set low.

The full combination of possible mutes for ADCs and DACs

using MPx pins are set in Register 0x0038 to Register 0x003E.

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