AS3418-EWLM datasheet(34/78 Pages) AMSOSRAM

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AS3418

Functional Description

Datasheet

• PUBLIC

DS000507

• v4-00 • 2020-Jan-23

│ 33

Figure 40:

2C Start-Up Sequence

6.8

Operation Modes

If the AS3418 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

MODE

Description

OFF

Chip is turned off.

ANC

Chip is turned on and active noise cancellation is enabled.

MODE/CSCL

VOL/CSDA

VBAT

BIAS & OSC ON

VNEG OK

Enable OPAMPs and MIC Amplifiers

MICS LDO Chargepump OK

typ. 55

Time Axis

[ms]

min. 1.4V

min. 70% VBAT

PWRUP_HOLD = 1

Enable MICS charge pump (MSUP)

Enable Right Music Bypass

~10ms

START EEPROM DOWNLOAD

EEPROM READY

~1ms

I2C_TIMEOUT = 8ms

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

I2C_MODE

PWR_HOLD

PWRUP_HOLD = 1

AS3418-EWLM Datasheet(PDF) 34 Page - ams-OSRAM AG

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