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 DC/DC 1.8V/600mA FM Receiver AT73C246 POWER Line In 2 x Mic In MANAGEMENT Reset UNIT DC/DC 1.2V/600mA & Line Out Control: TWI Digital Audio: I 2S STEREO LDO 1V/300mA LDO 3.3V/200mA Rechargeable Backup Battery DDR2 Memory MICROCONTROLLER e.g. SAM7, SAM9 Core CAP9, AVR32 Core Input/Output AUDIO CODEC Headset Wakeup AT73C246 Application Example BlueTooth WiFi AT73C246 Power Management Unit and Stereo Audio Codec DDR2 Memory VDD0 VDD1 VDD2 VDD3 VDD4 Backup Battery VBACKUP DCDC0 0.8V-3.6V 600mA 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 MCU Core MCU I/O & RF IC Headquarters Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel.: (+1) (408) 441 0311 Fax: (+1) (408) 487 2600 Power International Wakeup Reset Interrupt References Real Time Clock Clock Crystal Supply Monitor Power Fail Detector Power Management Unit Over Reset Temperature Generator Detector State Machine Crystal OSC 32kHz Auxiliary ADC Auxiliary Analog Input Two Wire Interface Control 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 Bypass Mux L Line R Sidetone Mic1 L R Mic2 L R Mux Aux DAC Speaker/ Headset L DAC Speaker/ Headset R Digital Signal Processor ADC ADC L R Sidetone 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 Bypass Stereo Audio Codec I2S 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 I2S bus. Digital sound output is transferred from the MCU via the I2S 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. 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 Product Contacts Technical Support www.atmel.com/products/ powermanage Sales Contacts www.atmel.com/contacts Web Site www.atmel.com © 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. 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