wm8351 Wolfson Microelectronics plc, wm8351 Datasheet

wm8351

Manufacturer Part Number

wm8351

Description

Wolfson Audioplus? Stereo Codec With Power Management

Manufacturer

Wolfson Microelectronics plc

Datasheet

1.WM8351.pdf (328 pages)

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DESCRIPTION

The WM8351 is an integrated audio and power management

subsystem which provides a cost effective, single-chip solution

for portable audio and multimedia systems.

The integrated audio CODEC provides all the necessary

functions for high-quality stereo recording and playback.

Programmable

connection of headphones and microphones with a minimum

of external components. A programmable low-noise bias

voltage is available to feed one or more electret microphones.

Additional audio features include programmable high-pass

filter in the ADC input path.

The WM8351 includes four programmable DC-DC converters,

four low-dropout (LDO) regulators and a current limit switch to

generate suitable supply voltages for each part of the system,

including the integrated audio CODEC as well as off-chip

components such as a digital core and I/O supplies, and LED

lighting. An additional on-chip regulator maintains the backup

power for always-on functions. The WM8351 can be powered

by a lithium battery, by a wall adaptor or USB.

An on-chip battery charger supports both trickle charging and

fast (constant current, constant voltage) charging of single-cell

lithium batteries. The charge current, termination voltage, and

charger time-out are programmable to suit different types of

batteries.

Internal power management circuitry controls the start-up and

shutdown sequencing of clocks and supply voltages. It also

detects and handles conditions such as under-voltage,

extreme temperatures, and deeply discharged or defective

batteries, with a minimum of software involvement.

A programmable constant-current sink is available for driving

LED strings, e.g. for display backlights or photo-flash

applications, in a highly power-efficient way. Additional RGB

LEDs can be driven through GPIO pins.

The WM8351 includes a 32.768kHz crystal oscillator, an

internal RC oscillator, a real-time clock (RTC) and an alarm

function capable of waking up the system. Internal circuitry

can generate all clock signals required to start up the device.

The master clock for the audio CODEC can be input directly,

or may be generated internally using an integrated, low power

Frequency Locked Loop (FLL).

To extend battery life, fine-grained power management

enables each function in the WM8351 to be independently

powered down through the control interface. The WM8351

forms part of the Wolfson AudioPlus

power management solutions.

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WOLFSON MICROELECTRONICS plc

Wolfson AudioPlus™ Stereo CODEC with Power Management

on-chip

amplifiers

http://www.wolfsonmicro.com/enews

allow for

series of audio and

the

direct

FEATURES

Stereo Hi-Fi CODEC

•

System Control

•

Supply Generation

•

LED Drivers

•

Battery Charger

•

Additional Features

•

APPLICATIONS

•

DAC SNR 95dB (‘A’ weighted @ 48kHz), THD –81dB

ADC SNR 95dB (‘A’ weighted @ 48kHz), THD –83dB

40mW on-chip headphone driver with ‘capless’ option

16Ω headphone load: THD -72dB, Po = 20mW

2 differential microphone inputs with low-noise bias

voltage and programmable preamps

Programmable high-pass filter for ADC

Microphone and Headphone detection

Auxiliary inputs for analogue signals

Sample rates: 8, 11.025, 16, 22.05, 24, 32, 44.1 or 48kHz

Support for 2-wire or 3-/4-wire Control Interface

Handles power sequencing, reset signals and fault

conditions

Autonomous power source selection (battery, wall adaptor

or USB bus)

Total current drawn from USB bus is limited to comply with

USB 2.0 standard and USB OTG supplement

1 x DC-DC Buck Converter (0.85V - 3.4V, Up to 1A)

2 x DC-DC Buck Converters (0.85V - 3.4V, Up to 500mA)

1 x DC-DC Boost Converter (5V - 20V, 40 to 200mA)

4 x LDO voltage regulators (0.9V - 3.3V, 150mA)

Programmable constant-current sink, suitable for screen

backlight or white LED photo flash

3 open-drain outputs for RGB LEDs

Single-cell Li-Ion / Li-Pol battery charger

Thermal protection for charge control; temperature

monitoring available for thermal regulation

LED outputs to indicate charge status and fault conditions

“Always on” RTC with wake-up alarm

Watchdog timer

Up to 13 configurable GPIO pins

On-chip crystal oscillator and internal RC oscillator

Low power FLL supporting wide range of input clocks

7x7mm, 129 BGA package, 0.5mm ball pitch

Portable Audio and Media players

Portable Navigation Devices

Portable systems powered by single-cell lithium batteries

Production Data, June 2009, Rev 4.1

WM8351

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