Improved accuracy increases energy availability up to 15% and additional monitoring functions ensure higher safety
Li-ion batteries are very popular in applications like mobile phones, media players, digital still cameras, PDAs or notebooks to name a few. While they offer high energy density, low weight and volume, they require careful monitoring and charging control to ensure safety and optimum life time.
Safety is a major criterion for battery usage and recent industry problems -- generating huge recalls from manufacturers -- illustrates the importance of safe and accurate control functions.
This also includes the need for authentication to ensure the user will use a certified battery and not a copy that can potentially be unsafe.
Atmel has been working with key battery manufacturers to develop optimized solutions and is now offering a full range of microcontrollers dedicated to Li-ion battery management supporting 1 to 4 cells. This product family offers a unique set of features to optimize performance and safety.
By giving extremely accurate voltage measurements it is possible to control the charge and discharge cut-off voltages more accurately, thus making it possible to use up to 15% extra energy of the battery compared to less accurate solutions while maintaining all safety requirements.
The accuracy is achieved using Atmel's patented method for calibrating the voltage reference in conjunction with high resolution Delta Sigma Analog to Digital converters for voltage measurement.
The family consists of 6 devices targeting different end markets. The ATmega4HVD and ATmega8HVD target the low-end consumer market requiring protection and authentication. For applications requiring gas gauge, the ATmega8HVA and ATmega16HVA are the ideal products, while the ATmega16HVB and ATmega32HVB targets the notebook battery market.
All parts are single chip battery side solutions incorporating a protection with high-side N-channel FET drivers.
Development boards / Reference designs -
Atmel has designed reference design kits showing how to build a complete battery pack using the new AVR battery management devices. The reference design kits include complete firmware and provide all needed safety measures for a Li-ion battery design. This includes over- and under-voltage protection and protection against excessive charge and discharge currents. The reference designs also features high accuracy voltage and current measurements, temperature checks, communication interface with command set based on battery specification, authentication and gas gauging.
To evaluate the performance of the reference designs, they are supported with the SB200 evaluation board. This board includes Lithium-ion batteries, a programmable charger and load, and a USB communication gateway between the reference kits and a PC. The SB200 connects to AVR Studio(R) by starting the AVR battery management services plug-in. Through this interface all battery parameters can be observed and modified, and the ATAVRSB200 functions are also controlled through this interface.
Video podcasts introducing the new devices and the development tools are available on the AVR TV website at http://www.avrtv.com.
Availability and Pricing -
The ATmega8HVA and ATmega16HVA, in 36-pin LGA and 28-pin TSOP packages, are in production now. Engineering samples of the ATmega8HVD in 28-pin DFN packages are available now, while the ATmega4HVD, ATmega16HVB and ATmega32HVB will be sampling in Q1 2009.
Prices start at $0.95, $1.14, $2.08 and $2.49 in 10,000 quantity pieces for ATmega4HVD, ATmega8HVD, ATmega8HVA and ATmega16HVA, respectively.
The ATmega8HVA and ATmega16HVA are supported by the SB201 reference design (ordering number: ATAVRSB201) that is available now at $139. The ATmega8HVD is supported by the SB204 reference design (ordering number: ATAVRSB204) that will be available from October 2008 at $99. The SB200 evaluation kit (ordering number: ATAVRSB200) is available now at $199.
About Atmel
Atmel is a worldwide leader in the design and manufacture of microcontrollers, advanced logic, mixed-signal, nonvolatile memory and radio frequency (RF) components. Leveraging one of the industry's broadest intellectual property (IP) technology portfolios, Atmel is able to provide the electronics industry with complete system solutions focused on consumer, industrial, security, communications, computing and automotive markets.
(C) 2008 Atmel Corporation. All Rights Reserved. Atmel(R), Atmel logo and combinations thereof, AVR(R), AVR studio(R) and others, are registered trademarks, or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others.
Information:
Podcasts on new battery management devices are available at:
http://www.avrtv.com
Battery management product information can be retrieved at:
http://www.atmel.com/bm/
For further information on AVR microcontrollers, go to:
http://www.atmel.com/avr/
Press Contacts:
Philippe Faure, Marketing Communications Director - Microcontrollers
Tel: +33 2 40 18 18 87, Email: philippe.faure@atmel.com
Helen Perlegos, Public Relations
Tel: (+1) 408 487-2963, Email: hperlegos@atmel.com
Web site:
http://www.atmel.com/
http://www.avrtv.com/
