AS3435 datasheet(43/102 Pages) AMSCO

43 / 102 page

ams Datasheet, Confidential: 2014-Jun-13 [v1-30]

AS3415/AS3435 – 43

Detaile d Desc rip t ion

Modes of Operation

If the AS3415/35 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 52.

Figure 52:

Operation Modes

Operation Modes: This table gives an overview of the different operation modes of the AS3415/35.

With the AS3415/35 the design engineer has different options

to enter the described operation modes shown in Figure 52. In

addition to the different switch and push buttons connections

described in the following three chapters, it is also important

to configure the chipset accordingly. Figure 53 shows the

required register configuration settings to enable the different

AS3415/35 control modes.

Figure 53:

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 chosen to

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

the noise cancellation, the headphone input multiplexer can be set to a different (normally to

MIC) source to increase speech intelligibility. In addition, the Line In gain can be lowered to

reduce the loudness of the music currently played back. If desired the music can also be

disabled completely in monitor mode. 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. This allows the user to

make use of a possibly implemented equalizer function like bass boost just for listening to

music without ANC function.

MODE

SLIDE_PWR_UP

SLIDER_MON

Button Mode

Do not use

Slider Mode

Full Slider Mode

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