Power Management and Analog Companions (PMAAC)
AT73C246
Power Management Unit and Stereo Audio Codec
Multimedia systems such as portable media players are typically built around a microcontroller, memories,
wireless communications ICs and audio input/output devices. The keys to their success are their audio
quality and their power efficiency.
Atmel’s AT73C246 is the ideal power management unit and stereo audio interface for such systems. It
integrates, in a single device, a high-quality audio codec and multiple power supplies that are precisely
adapted to the requirements of an MCU-based multimedia system. In particular, the AT73C246 is designed
to interface directly to Atmel’s AT91SAM9 and AT91CAP9 families of ARM9™- based microcontrollers and
their DDR2 memories.
The AT73C246 reduces the system chip count by replacing a number of discrete voltage regulators.
Operating from a single 2.9V to 5.5V power supply, it provides precisely calibrated voltages to all the other
components of the system, and enables these components to be powered down selectively when not
required. This keeps system power consumption to a minimum under all conditions of use.
The AT73C246 also provides high quality audio. It multiplexes the stereo inputs from two microphones, a
line in and an auxiliary input, and provides stereo output for headphones or an external speaker amplifier.
The audio inputs can be channeled directly to the output or digitized and transferred to the MCU for
recording or processing. In playback mode, digital signals originating from the MCU are converted to
high-fidelity analog for output.
By its high level of integration, precisely calibrated power supplies, configurable power management and
high-quality audio, the AT73C246 reduces the cost, board space and power consumption of a wide range
of multimedia applications while enhancing the sound quality.
ATMEL PRODUCT
2.9V - 5.5V
VBackup LDO 2.5V
Aux In
Rechargeable
Backup Battery
DDR2 Memory
FM Receiver
AT73C246
Line In
DC/DC 1.8V/600mA
Control: TWI
Digital Audio: I
2
S
Reset
DC/DC 1.2V/600mA
LDO 1V/300mA
LDO 3.3V/200mA
POWER
MANAGEMENT
2 x Mic In
MICROCONTROLLER
e.g. SAM7, SAM9
Core
Core
Input/Output
CAP9, AVR32
UNIT
&
Line Out
STEREO
AUDIO CODEC
Headset
Wakeup
BlueTooth
WiFi
AT73C246 Application Example
AT73C246
Power Management Unit and Stereo Audio Codec
DDR2
Memory
VDD0
MCU Core
VDD1
VDD2
MCU I/O & RF IC
VDD3
VDD4
Backup
Battery
VBACKUP
Headquarters
Atmel Corporation
2325 Orchard Parkway
San Jose, CA 95131, USA
Tel.: (+1) (408) 441 0311
Fax: (+1) (408) 487 2600
International
DCDC0
0.8V-3.6V
600mA
Power
Wakeup
Reset
Interrupt
Clock
Real Time
Clock
Crystal OSC
32kHz
DCDC1
0.8V-3.6V
600mA
LDO2
0.8V-1.9V
300mA
LDO3
2.7V-3.6V
200mA
LDO4
2.7V-3.6V
200mA
LDO5
BACKUP
2.5V
References
Supply
Monitor
Power Fail
Detector
Auxiliary
ADC
Two
Wire
Interface
Auxiliary
Analog
Input
Crystal
State
Machine
Power Management Unit
Over
Reset
Temperature
Generator
Detector
Control
Bypass
Mux
Line
L
R
ADC
L
Mic1
R
Mic2
L
R
Mux
L
Aux
R
ADC
Digital Signal
Processor
Sidetone
DAC
Speaker/
Headset L
Atmel Asia
Unit 1-5 & 16,
19/F BEA Tower
Millennium City 5
418 Kwun Tong Road
Kwun Tong, Kowloon
Hong Kong
Tel.: (852) 2245 6100
Fax: (852) 2722 1369
Atmel Europe
Le Krebs
8, rue Jean-Pierre Timbaud
B.P. 309
78054 Saint-Quentin-en-Yvelines
Cedex, France
Tel.: (33) 1 30 60 70 00
Fax: (33) 1 30 60 71 11
Atmel Japan
9F, Tonetsu Shinkawa Bldg.
1-24-8 Shinkawa
Chuo-ku, Tokyo 104-0033
Japan
Tel.: (81) 3 3523 3551
Fax: (81) 3 3523 7581
Product Contacts
Technical Support
www.atmel.com/products/
powermanage
Sales Contacts
www.atmel.com/contacts
Web Site
www.atmel.com
DAC
Sidetone
Bypass
Speaker/
Headset R
Stereo Audio Codec
I
2
S
Digital Audio
In/Out
The audio input of the AT73C246 is built around a stereo ADC with a 96dB dynamic range. It multiplexes/mixes
the inputs required by the majority of multimedia systems: two stereo microphones, an auxiliary input from, for
example, a FM receiver, and a line in from, for example, a digital media player. The audio input can be passed
directly to the stereo output if required, in bypass or sidetone mode that significantly reduces power consumption.
Otherwise the audio stream is digitized and transferred to the MCU via the industry-standard I
2
S bus.
Digital sound output is transferred from the MCU via the I
2
S bus before passing through a 100dB dynamic
range stereo DAC and output amplifiers that can directly drive a 60mW 16/32Ohm headset, or feed the input
of a stereo speaker amplifier. These highly integrated audio features offer unsurpassed sound quality.
The PMU of the AT73C246 is built around a dedicated set of voltage regulators, each configurable in 50mV
steps to provide precisely the voltage, current and noise immunity required by the MCU core and its I/Os, and
also the memory and RF/analog sections in the multimedia system. Each supply channel features fast and
accurate transient load responses, automatic ramping (digital voltage scaling), output voltage monitoring, and
over-current protection. Through its TWI bus control, the AT73C246 offers
numerous possibilities for power optimization. In addition to individual
function shutdown, it saves power with a fully programmable
standby and wake-up scenario where the application
can be partially or fully powered down.
To further reduce the bill-of-materials and space
requirements of the multimedia system, the AT73C246
also integrates a real-time-clock generator and a set of
auxiliary analog inputs that drive a 10-bit ADC for sensing and
measurement functions. Finally, the AT73C246 is delivered
in a compact 7.5x7.5mm QFN package that saves more than
30% of board space over alternative solutions.
© 2010 Atmel Corporation.
All rights reserved. Atmel
®
, Atmel logo
and combinations thereof, and others
are registered trademarks or trademarks
of Atmel Corporation or its subsidiaries.
ARM
®
and others are registered
trademarks or trademarks of ARM Ltd.
Other terms and product names may
be trademarks of others.
Rev.: 11058A-PMAAC-04/10/2M
AT73C246 Board
Disclaimer:
The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel
products. EXCEPT AS SET FORTH IN ATMEL’S TERMS AND CONDITIONS OF SALES LOCATED ON ATMEL’S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY
RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY
DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS AND PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE
USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this
document and reserves the right to make changes to specifications and products descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel
products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life.
京公网安备 11010802033920号
EEWORLD
