Atmel Evaluation Kit for AT32uC3A0512, 32-Bit AVR Microcontroller Atmel ATEVK1105 ATEVK1105 数据表
产品代码
ATEVK1105
Page 14
AVR Microcontrollers
December 2008
2 Application area in Focus: Atmel’s new Battery Management
Family
Atmel announced in October a family of single-chip Li-ion battery management devices.
Combining Atmel's patented high voltage manufacturing process and AVR® microcontrollers'
technology, the new family gives an extremely high analog accuracy at very low power
consumption, while ensuring that portable handheld applications have all the necessary safety
functions.
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.
2.1 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® 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.