WM8352
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Wolfson AudioPlus™ Stereo CODEC with Power Management
DESCRIPTION
FEATURES
Stereo Hi-Fi CODEC
The WM8352 is an integrated audio and power management
subsystem which provides a cost effective, single-chip solution
for portable audio and multimedia systems.
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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
The integrated audio CODEC provides all the necessary
functions for high-quality stereo recording and playback.
Programmable on-chip amplifiers allow for the direct
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.
2 differential microphone inputs with low-noise bias
voltage and programmable preamps
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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
The WM8352 includes six 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 WM8352 can be powered
by a lithium battery, by a wall adaptor or USB.
System Control
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Support for 2-wire or 3-/4-wire Control Interface
Handles power sequencing, reset signals and fault
conditions
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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
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.
Supply Generation
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2 x DC-DC Buck Converters (0.85V - 3.4V, Up to 1A)
2 x DC-DC Buck Converters (0.85V - 3.4V, Up to 500mA)
2 x DC-DC Boost Converters (5V - 20V, 40 to 200mA)
4 x LDO voltage regulators (0.9V - 3.3V, 150mA)
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.
LED Drivers
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2 programmable constant-current sinks, suitable for
screen backlight or white LED photo flash
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3 open-drain outputs for RGB LEDs
Two programmable constant-current sinks are 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.
Battery Charger
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Single-cell Li-Ion / Li-Pol battery charger
Thermal protection for charge control; temperature
monitoring available for thermal regulation
The WM8352 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.
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LED outputs to indicate charge status and fault conditions
Additional Features
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“Always on” RTC with wake-up alarm
Watchdog timer
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).
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
To extend battery life, fine-grained power management
enables each function in the WM8352 to be independently
powered down through the control interface. The WM8352
forms part of the Wolfson AudioPlusTM series of audio and
power management solutions.
APPLICATIONS
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Portable Audio and Media players
Portable Navigation Devices
Portable systems powered by single-cell lithium batteries
Production Data, February 2011, Rev 4.4
WOLFSON MICROELECTRONICS plc
Copyright ©2011 Wolfson Microelectronics plc
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