CS47L85 datasheet(2/370 Pages) CIRRUS

2 / 370 page

CS47L85

Rev 4.3

Description

The CS47L85 is a highly integrated, low-power audio and sensor hub system for smartphones, tablets and other portable

audio devices. It combines an advanced DSP feature set with a flexible, high-performance audio hub codec. The

CS47L85 combines seven programmable DSP cores with a variety of power-efficient fixed-function audio processors.

Extensive GPIO and I2C master interfaces enable powerful sensor fusion functions to be integrated.

The DSP cores support multiple concurrent audio features, including multimic wideband noise reduction, high-

performance acoustic-echo cancellation (AEC), mono ambient noise cancellation (ANC), speech enhancement, advanced

media enhancement, and many more. The CS47L85 sensor hub technology enables applications to support increased

contextual awareness, including advanced motion sensing and pedestrian navigation functionality. The DSP cores are

supported by a fully flexible, all-digital mixing and routing engine with sample rate converters, for wide use-case flexibility.

Support for third-party DSP programming provides far-reaching opportunities for product differentiation.

A SLIMbus interface supports multi-channel audio paths and host control register access. Four further digital audio

interfaces are provided, each supporting a wide range of standard audio sample rates and serial interface formats.

Automatic sample rate detection enables seamless wideband/narrowband voice-call handover.

Three stereo headphone drivers each provide stereo ground-referenced or mono BTL outputs. 121dB SNR, and noise

levels as low as 0.8

μVRMS, offer hi-fi quality line or headphone output. The CS47L85 also features a stereo pair of 2.5-W

Class D outputs, four channels of stereo PDM output, and an IEC-60958-3

–compatible S/PDIF transmitter. A signal

generator for controlling haptics devices is included; vibe actuators can connect directly to the Class D speaker output or

via an external driver on the PDM output interface. All inputs, outputs, and system interfaces can function concurrently.

The CS47L85 supports up to 9 analog inputs, and up to 12 PDM digital inputs. Microphone activity detection with interrupt

is available. A smart accessory interface supports most standard 3.5mm accessories. Impedance sensing and

measurement is provided for external accessory and push-button detection.

The CS47L85 is configured using the SLIMbus, SPI

™, or I2C interfaces. Three integrated FLLs provide support for a wide

range of system clock frequencies. The device is powered from 1.8- and 1.2-V supplies. (A separate 4.2-V battery supply

is typically required for the Class D speaker drivers). The power, clocking and output driver architectures are all designed

to maximise battery life in voice, music and standby modes. Low-power (10µA)

‘Sleep’ is supported, with configurable

wake-up events.

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