CS47L85 datasheet(67/370 Pages) CIRRUS

67 / 370 page

CS47L85

Rev 4.3

INPUT SIGNAL PATH ANC CONTROL

The CS47L85 incorporates a mono Ambient Noise Cancellation (ANC) processor which can provide noise reduction in a

variety of different operating conditions.

The input source for the Receive Path ANC function is selected using INRXANCL_SEL and FCL_MIC_MODE_SEL, as

described in Table 6.

See “Ambient Noise Cancellation” for further details of the ANC function.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R3841

(0F01h)

ANC_SRC

2:0

IN_RXANCL_SE

L [2:0]

000

Input source for Rx ANC function

000 = No selection

001 = Input Path 1

010 = Input Path 2

011 = Input Path 3

100 = Input Path 4

101 = Input Path 5

110 = Input Path 6

111 = Reserved

R3863

(0F17h)

FCL ADC

reformatte

r control

3:2

FCL_MIC_MODE

_SEL

Input channel for Rx ANC function

00 = Disabled

01 = Left channel

10 = Right channel

11 = Left + Right channels (only valid if

signal path is configured for digital input)

Table 6 Input Signal Paths ANC Control

DIGITAL MICROPHONE PIN CONFIGURATION

Digital Microphone (DMIC) operation on Input paths IN1, IN2 and IN3 is selected using the INn_MODE registers, as

described in Table 3. When DMIC is selected, the respective DMICCLKn and DMICDATn pins are configured as digital

outputs and inputs respectively.

DMIC operation on Input paths IN4, IN5 and IN6 is implemented on multi-function GPIO pins, which must be configured for

the respective DMIC functions when required. The DMIC connections are pin-specific alternative functions on specific GPIO

pins. See “General Purpose Input / Output” to configure the GPIO pins for DMIC operation.

The CS47L85 provides integrated pull-down resistors on each of the DMICDATn pins. This provides a flexible capability for

interfacing with other devices.

The DMICDAT1, DMICDAT2 and DMICDAT3 pull-down resistors can be configured independently using the register bits

described in Table 7. Note that, if the DMICDATn digital microphone input paths are disabled, then the pull-down will be

disabled on the respective pin.

In the case of the DMIC4, DMIC5 and DMIC6 interfaces, integrated pull-up and pull-down resistors are provided as part of

the GPIO functionality, and can be configured using the register bits described in Table 94.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R840

(0348h)

Dig_Mic_P

ad_Ctrl

DMICDAT3_PD

DMICDAT3 Pull-Down Control

0 = Disabled

1 = Enabled

DMICDAT2_PD

DMICDAT2 Pull-Down Control

0 = Disabled

1 = Enabled

DMICDAT1_PD

DMICDAT1 Pull-Down Control

0 = Disabled

1 = Enabled

Table 7 Digital Microphone Interface Pull-Down Control

DIGITAL CORE

The CS47L85 digital core provides extensive mixing and processing capabilities for multiple signal paths. The configuration

is highly flexible, and virtually every conceivable input/output connection can be supported between the available processing

CS47L85 Datasheet(PDF) 67 Page - Cirrus Logic

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