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AS3418

Functional Description

Datasheet

• PUBLIC

DS000507

• v4-00 • 2020-Jan-23

│ 37

Figure 47:

Push Button Mode

Figure 48:

Push Button Timing Diagram

6.8.4

Playback Only Mode

The active noise cancelling feature of the AS3418 can also be disabled with the ANC/CSDA pin. The

ANC/CSDA pin has to be pulled high to enable the ANC function during startup (ANC MODE). If the

pin is connected to ground, the chip enters playback only mode (PBO MODE) in which the ANC

function can be disabled or an alternative monitor/ANC mode is configured. The functional blocks in

this operation mode can be controlled in registers PBO_MODE0 and PBO_MODE1. Typically only the

line input amplifiers and the headphone amplifier are enabled in the playback only mode. If this

function is not desired you just need to pull the pin high with an external

22kΩ resistor.

MODE/CSCL

ANC/CSDA

Control Logic

VBAT

ANC

PBO

22k

ON/OFF/MONITOR

MODE/CSCL Pin

OFF

ANC

MONITOR

ANC

OFF

> PWR_UP_BUT_TIME

>65% VBAT

<35% VBAT

Operation Mode

> MON_TIME

>PWR_DOWN_BUT_TIME

> MON_TIME

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