AS3412 datasheet(34/85 Pages) AMSOSRAM

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[v1-00] 2016-Apr-06

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AS3412 − Detailed Description

Operation Modes

If the AS3412 is in stand-alone mode (no I²C control), the device

can work in different operation modes. An overview of the

different operation modes is shown in Figure 41.

Figure 41:

Operation Modes

Operation Modes: This table gives an overview of the different operation modes of the AS3412.

With the AS3412 the design engineer has different options to

enter the described operation modes shown in Figure 41. In

addition to the different switch and push button connections

described in the following three chapters, it is also important

to configure the chipset accordingly. Figure 42 shows the

required register configuration settings to enable the different

AS3412 control modes.

Figure 42:

User Interface Control Modes

Stand Alone Operation Mode: Shows the different operation modes that can be selected with push button

control or slide switch control.

MODE

Description

OFF

Chip is turned off.

ANC

Chip is turned on and active noise cancellation is active

MONITOR

In monitor mode, a different (normally higher) microphone preamplifier gain can be configured

to get an amplification of the ambient noise. To get rid of the low pass filtering needed for the

noise cancellation, the headphone input multiplexer can be set to a different (typically MIC)

source to increase speech intelligibility. In addition, the Line Input can be muted to further

enhance speech intelligibility. If the device is operated in I²C mode, it is also possible to enter the

monitor mode by setting the MON_MODE bit in register 0x3D.

PBO

The Playback Only Mode is a special mode that disables the noise cancelling function and just

keeps the line input amplifier as well as the headphone amplifier active.

MODE

SLIDE_PWR_UP

SLIDER_MON

Button Mode

Do not use

Slider Mode

Full Slider Mode

AS3412 Datasheet(PDF) 34 Page - ams-OSRAM AG

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