Atmel Battery Management

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1 Battery Management Li-Ion Battery Management Solution for Automotive and Industrial Applications

2 Li-Ion Battery Management Due to its cutting-edge characteristics, Lithium-Ion (Li-Ion) is the preferred technology for modern highperformance batteries. Up to 30% smaller and 50% lighter than conventional NiMH batteries, Li-Ion batteries also store much more energy. However, while Li-Ion batteries offer important advantages in terms of size, weight, recharge speed, life span, and resistance to memory effects, they do have a tendency to overheat when overcharged or during deep discharging. This makes protection and safety functions paramount concerns in Li-Ion battery applications. The ATA6870 Li-Ion Battery-Cell Measuring Circuit and ATA6871 Li-Ion Battery-Cell Monitoring Circuit, provide one of the safest solution on the market for monitoring Li-Ion batteries. Applications Electric/hybrid vehicles Uninterruptible power supplies (UPS) Golf carts Power tools Motorcycle, ebikes Wheelchairs Forklifts Portable medical equipment /

3 Battery Management Li-Ion Battery Management Solution for Automotive and Industrial Applications Start ATA6871 ATA6870 Failure Status Communication Bus Microcontroller Supply ATA6871 ATA6870 To Emergency Relay ATmega32C1 CAN Transceiver Battery Management 2

4 ATA6870 Cell 1 Referencing ADC Cell Balancing Digital Level Shifter Standby Control 3.3V Voltage Regultor Cell 6 Referencing ADC Cell Balancing Digital Level Shifter Logic 3.3V Internal Voltage Regulor Internal Biasing Communication Bus with Level Shifters Cell Temperature Measuring Digital Level Shifter Microcontroller Interface Microcontroller ATA6870 Li-Ion Battery-Cell Measuring Circuit The ATA6870 is a battery-cell measuring, power supply, and charge-balancing circuit for Li-Ion multi-cell battery stacks. It monitors the battery-cell voltage and battery-cell temperature with 12-bit ADCs. The circuit also provides charge-balancing capabilities for each battery cell. In addition, a linear regulator is integrated to supply a microcontroller or other external components. Reliable communication between stacked ICs is achieved by level shifters with current sources and checksum monitoring of data. The ATA6870 can also be connected to three, four, five, or six battery cells. Up to 16 circuits (96 cells) can be cascaded in one string, and the number of possible strings is unlimited. Features 12-bit battery-cell voltage measurement Outstanding voltage reference without temperature drift Reliable measuring data due to high spike and noise suppression Simultaneous battery-cell measurement for the complete stack in parallel Cell temperature measurement Integrated power supply for microcontrollers Active and passive charge-balancing capability Reliable communication with checksum monitoring of data Less than 10μA standby current Hot plug-in capable Benefits Together with the ATA6871, provides highest safety level for Li-Ion batteries Cost-saving due to cost-optimized 30V CMOS technology /

5 Battery Management Li-Ion Battery Management Solution for Automotive and Industrial Applications ATA6871 Cell 1 Overvoltage Undervoltage Detection OV UV 6 6 Input OR Debouncing 2 sec Standby Control Status in Self Test Status out Cell 6 Overvoltage Undervoltage Detection OV UV 6 6 Input OR Debouncing 2 sec 3.3V Internal Voltage Regulor Internal Biasing Chip Configuration Overtemperature Comparator Debouncing 2 sec 4 Input OR To Emergency Relays ATA6871 Li-Ion Battery-Cell Monitoring Circuit The ATA6871 is a battery-cell monitoring circuit that acts as an emergency, safety, and backup circuit in Li-Ion battery systems. It monitors overvoltage, undervoltage, and battery-cell temperature without requiring a microcontroller. The ATA6871 offers an advanced self-test function to check the monitoring comparators, open and shorted measuring lines, as well as communication lines. The ATA6871 can monitor four, five, or six battery cells, and can be stacked up to 16 times in one string. The number of possible strings is unlimited. Features Overvoltage, undervoltage, and cell temperature monitoring Self-diagnosis, including: Comparator functions Communication lines Short and open measuring lines Hot plug-in capable Less than 10μA standby current Benefits Highest safety levels for Li-ion batteries due to: Hardware-implemented monitoring thresholds Works without software or microcontroller extended self-test capability High flexibility due to customizable overvoltage and undervoltage thresholds* Cost-effective solution due to cost-optimized 30V CMOS Technology * Available with adequate volumes Battery Management 4

6 Tools and Support provides evaluation boards for both the ATA6870 and ATA6871 battery monitoring circuits. These boards enable the simplest and fastest testing of circuits. Three stacked ATA6870 or ATA6871 circuits are available on the boards to enable the monitoring of 18 Li-Ion battery cells. The evaluation boards are easily stackable, making it possible to build and evaluate a complex monitoring system for high performance Li-Ion batteries with little effort. A detailed description of the boards can be downloaded from In addition, the evaluation kit for the ATA6870 also includes control software with an intuitive graphical user interface. The software enables easy control of the board from a desktop or laptop PC. In addition to the measurement and graphic representation of the cells voltages, the software also enables the monitoring of individual cells, overvoltage and undervoltage, as well as simple controlling of the cell-balancing function. The kit also enables advanced users to write programming sequences to verify the complete monitoring process for a Li-Ion battery. For debugging purposes, the programming sequence can be run as a step-by-step procedure /

7 Battery Management Li-Ion Battery Management Solution for Automotive and Industrial Applications Ordering Information Part Number Package Remarks ATA6870-PLPW QFN48, 7mm x 7mm 1k Tape and Reel ATA6870-PLQW QFN48, 7mm x 7mm 4k Tape and Reel ATA6871-TLPW SSO28 1k Tape and Reel ATA6871-TLQW SSO28 4k Tape and Reel ATA6870-DK ATA6871-DK Development Kit Development Kit Battery Management 6

8 Corporation 2325 Orchard Parkway San Jose, CA USA Tel: (+1)(408) Fax: (+1)(408) Asia Limited Unit 01-5 & 16, 19F BEA Tower, Millennium City Kwun Tong Road Kwun Tong, Kowloon HONG KONG Tel: (+852) Fax: (+852) Munich GmbH Business Campus Parkring 4 D Garching b. Munich GERMANY Tel: (+49) Fax: (+49) Japan 9F, Tonetsu Shinkawa Bldg Shinkawa Chuo-ku, Tokyo JAPAN Tel: (+81)(3) Fax: (+81)(3) Corporation. All rights reserved. / Rev.: 9019B-AUTO-02/11, logo and combinations thereof, and others are registered trademarks or trademarks of Corporation or its subsidiaries. Other terms and product names may be trademarks of others Disclaimer: The information in this document is provided in connection with 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 products. EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE, 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. 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. does not make any commitment to update the information contained herein. Unless specifically provided otherwise, products are not suitable for, and shall not be used in, automotive applications. products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life.

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