ES9218P datasheet(13/101 Pages) ESS

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ES9218P Datasheet

CONFIDENTIAL ADVANCE INFORMATION 1.8

December 6, 2018

ESS TECHNOLOGY, INC. 237 South Hillview Drive, Milpitas, CA 95035, USA Tel (408) 643-8800 • Fax (408) 643-8801

Functional Description – Digital Features

Digital Audio Path

DSD Decode

I2S/LJ

Decode

I2C Control

Interface

Channel

Mapping

Channel

Mapping

Volume

Control

Automute

Oversampling

Filter

(Slow or Fast)

8x IIR Filter

(Slow or Fast)

ASRC to CLK

Domain

Noise Shaped

Modulators

THD

Compensation

DoP Decode

Figure 3 - Digital audio path

Soft Mute

When Mute is asserted the output signal will be ramped to the –

 level. When Mute is reset the attenuation level will ramp back up to the previous

level set by the volume control register. Asserting Mute will not change the value of the volume control register. The ramp rate is set by Register 6:

DoP and Volume Ramp Rate (0x06) according to the following relationship:

2vol_rate ∗ FS

512

dB/s

Mute can be triggered by any of the following settings:

•

GPIO. See Register 8: GPIO1-2 Configuration (0x08).

•

Explicit register setting. See Register 7: Filter Bandwidth and System Mute (0x07).

•

Automute. See Automute.

Automute

Automute must be enabled and configured using Register 2: Mixing, Serial Data and Automute Configuration (0x02). It is disabled by default.

Automute is triggered when any one of the following conditions are met:

Mode

Detection Condition

Time

PCM

Data is lower than automute_level for the

specified time

2096896 / (automute_time x 64 x fs)

DSD

Equal number of 1s and 0s in every 8 bits

of data

2096896 / (automute_time) x DATA_CLK)

Automute_time can be set using Register 4: Automute Time (0x04).

Automute_level can be set using Register 5: Automute Level (0x05).

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