CS47L85 datasheet(46/370 Pages) CIRRUS

46 / 370 page

CS47L85

Rev 4.3

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.

The CS47L85 supports up to 40 GPIO pins, offering a range of input/output functions for interfacing, detection of external

hardware, and to provide logic outputs to other devices. The CS47L85 provides 8 dedicated GPIO pins; a further 32 GPIOs

are multiplexed with other functions. Comprehensive Interrupt (IRQ) functionality is also provided for monitoring internal and

external event conditions.

A signal generator for controlling haptics devices is included, compatible with both Eccentric Rotating Mass (ERM) and

Linear Resonant Actuator (LRA) haptic devices. The haptics signal generator is highly configurable, and can execute

programmable drive event profiles, including reverse drive control. An external vibe actuator can be driven directly by the

Class D speaker output.

The CS47L85 incorporates eight general purpose timers, providing support for the sensor hub capability. Sensor event

logging, and other real time application functions, allows many advanced functions to be implemented with a high degree of

autonomy from a host processor.

A smart accessory interface is included, supporting most standard 3.5mm accessories. Jack detection, accessory sensing

and impedance measurement is provided, for external accessory and push-button detection. Accessory detection can be

used as a ‘Wake-Up’ trigger from low-power standby. Microphone activity detection with interrupt is also available.

System clocking can be derived from the MCLK1 or MCLK2 input pins. Alternatively, the SLIMbus interface, or the audio

interfaces (configured in Slave mode), can be used to provide a clock reference. Three integrated Frequency Locked Loop

(FLL) circuits provide support for a wide range of clocking configurations, including the use of a 32kHz input clock reference.

The CS47L85 can be powered from 1.8V and 1.2V external supplies. A separate supply (4.2V) is typically required for the

Class D speaker driver. Integrated Charge Pump and LDO Regulators circuits are used to generate supply rails for internal

functions and to support powering or biasing of external microphones.

CS47L85 Datasheet(PDF) 46 Page - Cirrus Logic