CS47L35 datasheet(28/300 Pages) CIRRUS

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DS1085F3

CS47L35

4.1 Overview

The CS47L35 is ideal for mobile telephony, providing enhanced voice communication quality for both near-end and far-end

users in a wide variety of applications. The SoundClear Control voice command recognition software is supported, for

low-power always-on features. Speaker Protection software is available, using analog input paths to support current

monitoring in the speaker output; this allows the Class D output to be continually optimized for the operational limits of the

speaker, and enables maximum audio output while ensuring the loudspeakers are fully protected from damage.

The digital core also provides signal-processing capability for sensor-hub functions of the CS47L35. Sensors and

accessories can be connected through the master I2C interface; the programmable DSP, together with peripheral timer

and event logging functions, enables applications to use these inputs to support increased contextual awareness,

including advanced motion sensing and navigation functionality.

Highly flexible digital mixing, including mixing between audio interfaces, is possible. The CS47L35 performs multichannel

full-duplex isochronous sample-rate conversion, providing use-case flexibility across a broad range of system

architectures. Automatic sample-rate detection is provided, enabling seamless wideband/narrowband voice call handover.

DRC functions are available for optimizing audio signal levels. In playback modes, the DRC can be used to maximize

loudness, while limiting the signal level to avoid distortion, clipping, or battery droop, for high-power output drivers such as

speaker amplifiers. In record modes, the DRC assists in applications where the signal level is unpredictable.

The five-band parametric EQ functions can be used to compensate for the frequency characteristics of the output

transducers. EQ functions can be cascaded to provide additional frequency control. Programmable high-pass and

low-pass filters are also available for general filtering applications, such as removal of wind and other low-frequency noise.

4.1.3

Digital Interfaces

Three serial digital audio interfaces (AIFs) each support PCM, TDM, and I2S data formats for compatibility with most

industry-standard chipsets. AIF1 supports six input/output channels; AIF2 and AIF3 support two input/output channels

each. Bidirectional operation at sample rates up to 192 kHz is supported.

Four digital PDM input channels are available (two stereo interfaces); these are typically used for digital microphones,

powered from the integrated MICBIAS power-supply regulators. Two PDM output channels are also available (one stereo

interface); these are typically used for external power amplifiers. Embedded mute codes provide a control mechanism for

external PDM-input devices.

The CS47L35 features a SLIMbus interface, compliant with the MIPI® SLIMbus specification, providing six channels of

audio input/output. Mixed audio sample rates are supported on the SLIMbus interface. The SLIMbus interface also

supports read/write access to the CS47L35 control registers.

An IEC-60958-3–compatible S/PDIF transmitter is incorporated, enabling stereo S/PDIF output on a GPIO pin. Standard

S/PDIF sample rates of 32–192 kHz are supported.

Control register access and high bandwidth data transfer are supported by a slave SPI interface and a slave I2C control

interface. The SPI interface operates up to 26 MHz; the I2C slave interface operates up to 3.4 MHz. Full access to the

The CS47L35 incorporates one master I2C interface, offering capability for additional sensor/accessory input. Typical

sensors include accelerometers, gyroscopes and magnetometers for motion sensing and navigation applications. Other

example accessories include barometers, or ambient light sensors, for environmental awareness.

4.1.4

Other Features

The CS47L35 incorporates two 1-kHz tone generators that can be used for beep functions through any of the audio signal

paths. The phase relationship between the two generators is configurable, providing flexibility in creating differential

signals, or for test scenarios.

A white-noise generator is provided that can be routed within the digital core. The noise generator can provide comfort

noise in cases where silence (digital mute) is not desirable.

Two pulse-width modulation (PWM) signal generators are incorporated. The duty cycle of each PWM signal can be

modulated by an audio source or can be set to a fixed value using a control register setting. The PWM signal generators

can be output directly on a GPIO pin.

CS47L35 Datasheet(PDF) 28 Page - Cirrus Logic

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