Техническая Спецификация для Atmel Evaluation Kit for AT32uC3A0512, 32-Bit AVR Microcontroller Atmel ATEVK1105 ATEVK1105

 

 

Page 14 

December 2008 

 
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. 
 

 
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.