AS3418 datasheet(32/77 Pages) AMSCO

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AS3418

Functional Description

Datasheet

• PUBLIC

DS000507

• v4-00 • 2020-Jan-23

│ 32

mode. In case the I2C_MODE bit is set the device behaves differently during startup compared to

normal operation with external slide switch or push button.

Figure 39:

Normal Start-Up Sequence

MODE/CSCL

VOL/CSDA

VBAT

BIAS & OSC ON

VNEG OK

Enable OPAMPs and MIC Amplifiers

MICS LDO Chargepump OK

typ. 52

Time Axis

[ms]

min. 1.4V

min. 70% VBAT

don‘t care

Enable MICS charge pump (MSUP)

Enable Right Music Bypass

~10ms

START EEPROM DOWNLOAD

EEPROM READY

~1ms

PWR_UP_BUT_TIME

(5ms-2500ms)

MICS LDO OK

~5ms

Enable Left Music Bypass

Enable Line Zero Cross Comparator

~40µs masking

31ms timeout

Right Zero Cross Detect

Left Zero Cross Detect

Enable Headphone Right

Enable Headphone Left

Configure HPH_MUX

not connected b‘11‘

ANC_HPH_MUX<1:0>

PWRUP COMPLETE

Fade in MIC Gain

MUTE

FADE IN MIC GAIN

ANC_MICx_GAIN<6:0>

START_RAMP_TIME

Operating State

ANC Operation

OFF

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