Atmel Battery Management Atmel Li-Ion Battery Management Solution for Automotive and Industrial Applications Atmel 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 Atmel® ATA6870 Li-Ion Battery-Cell Measuring Circuit and Atmel ATA6871 Li-Ion Battery-Cell Monitoring Circuit, provide one of the safest solution on the market for monitoring Li-Ion batteries. 1 Applications • Electric/hybrid vehicles • Uninterruptible power supplies (UPS) • Golf carts • Power tools • Motorcycle, eBikes • Wheelchairs • Forklifts • Portable medical equipment © 2011 / www.atmel.com Atmel Battery Management Atmel Li-Ion Battery Management Solution for Automotive and Industrial Applications Atmel ATA6871 Atmel ATA6870 To Emergency Relay Atmel Battery Management Microcontroller Supply Atmel ATA6870 Communication Bus Atmel ATA6871 Status Failure Start Atmel ATmega32C1 CAN Transceiver 2 Cell 1 Referencing ADC Cell Balancing Digital Level Shifter Atmel ATA6870 Standby Control 3.3V Voltage Regultor Logic Digital Level Shifter 3.3V Internal Voltage Regulor Cell 6 Referencing ADC Cell Balancing Internal Biasing Cell Temperature Measuring Digital Level Shifter Communication Bus with Level Shifters Atmel ATA6870 Li-Ion Battery-Cell Measuring Circuit The Atmel® 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. 3 Microcontroller Interface Microcontroller 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 Atmel ATA6871, provides highest safety level for Li-Ion batteries • Cost-saving due to cost-optimized 30V CMOS technology © 2011 / www.atmel.com Atmel Battery Management Atmel Li-Ion Battery Management Solution for Automotive and Industrial Applications Atmel ATA6871 Cell 1 Overvoltage Undervoltage Detection Cell 6 Overvoltage Undervoltage Detection OV Standby Control 6 6 Input OR Debouncing 2 sec Status in Self Test UV Status out 3.3V Internal Voltage Regulor OV 6 6 Input OR Debouncing 2 sec Internal Biasing UV Chip Configuration Overtemperature Comparator Debouncing 2 sec 4 Input OR To Emergency Relays Atmel ATA6871 Li-Ion Battery-Cell Monitoring Circuit The Atmel® 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. Atmel Battery Management 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 4 Tools and Support Atmel® provides evaluation boards for both the Atmel ATA6870 and Atmel 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 http://www.atmel.com. 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. 2 5 © 2011 / www.atmel.com Atmel Battery Management Atmel Li-Ion Battery Management Solution for Automotive and Industrial Applications Ordering Information Package Remarks ATA6870-PLPW Atmel Part Number 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 Development Kit ATA6871-DK Development Kit Atmel Battery Management 6 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: (+1)(408) 441-0311 Fax:(+1)(408) 487-2600 www.atmel.com Atmel Asia Limited Unit 01-5 & 16, 19F BEA Tower, Millennium City 5 418 Kwun Tong Road Kwun Tong, Kowloon HONG KONG Tel: (+852) 2245-6100 Fax:(+852) 2722-1369 Atmel Munich GmbH Business Campus Parkring 4 D-85748 Garching b. Munich GERMANY Tel: (+49) 89-31970-0 Fax:(+49) 89-3194621 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 © 2011 Atmel Corporation. All rights reserved. / Rev.: 9019B-AUTO-02/11 Atmel®, logo and combinations thereof, and others are registered trademarks or trademarks of Atmel 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 Atmel 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 Atmel products. 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