ES9218PC datasheet(41/101 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

Bits

[7:6]

[5]

[4]

[3:2]

[1:0]

Mnemonic

automute_config

analog_automute

automute_timer_fast

ch2_mix_sel

ch1_mix_sel

Default

2’b00

1’b1

2’b01

2’b00

Bit

Mnemonic

Description

[7:6]

automute

config

Configures the automute state machine, which allows the ES9218P to perform different power

saving and sound optimizations.

•

2’b00: normal operation (default)

•

2’b01: perform a mute when an automute condition is asserted

•

2’b10: ramp all channels to ground when an automute condition is asserted

•

2’b11: perform a mute and then ramp all channels to ground when an automute

condition is asserted

Note: Ramping the internal DAC outputs to ground can reduce the power consumption of the

ES9218P in some situations.

Note: The ramp speed can be changed by using the automute_time, volume_rate and

soft_start_rate registers.

[5]

analog_automute

Allows the analog volume control to be driven to -24dB of full scale when an automute condition

occurs.

•

1’b0: analog volume control is left ‘as programmed’ when an automute occurs

•

1’b1: analog volume control is pushed to -24dB when an automute occurs

[4]

automute_timer_fast

If disabled, the automute time is multiplied by 8, resulting in a longer delay before an automute

event is triggered.

•

1’b0: automute time is calculated by the regular formula (see Register 4: Automute

Time (0x04)) multiplied by 8

•

1’b1: automute time is calculated by the regular formula (default)

[3:2]

ch2_mix_sel

Selects which data is mapped to DAC Right (OUT_R)

•

2’b00: ch1

•

2’b01: ch2 (default)

•

2’b10: reserved

•

2’b11: reserved

[1:0]

ch1_mix_sel

Selects which data is mapped to DAC Left (OUT_L)

•

2’b00: ch1 (default)

•

2’b01: ch2

•

2’b10: reserved

•

2’b11: reserved

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