AS8506C Battery Cell Monitor and Balancer IC The AS8506C is a battery management IC dedicated to support General Description cell voltage measurement, monitoring, cell balancing and temperature measurement functions in Li-Ion battery stacks for industrial/consumer/PV battery applications. Ambient temperature range is from -40C to 85C. It features cell voltage diagnosis with externally adjustable upper and lower cell voltage limits, fast cell voltage capture on request through 12-bit SAR ADC, passive cell balancing by simultaneous comparison of actual cell voltages with a reference cell voltage and temperature measurement on two external NTC sensors through 12-bit ADC. Cells that are above reference will sequentially be discharged through integrated switches and one external resistor. There is also an active balancing option AS8506C-A through factory setting to sequentially charge cells which are below reference from an external DC-DC Flyback converter and an integrated low side driver. The device can be used flexibly for battery stacks up to 7 cells with a minimum stack voltage of 6V and a maximum stack voltage of 32V. It can be chained to support battery packs of virtually any number of cells in synchronized mode through chained clock and trigger signal. The status of the battery stack is communicated to outside world through ORd voltage ok signal and balance ready signal. Ordering Information and Content Guide appear at end of datasheet. ams Datasheet (discontinued) Page 1 v1-05 2017-Jun-23 Document FeedbackAS8 506 C Gen e ra l De s c rip t ion Key Benefits & Features The benefits and features of AS8506C, Battery Cell Monitor and Balancer IC are listed below: Figure 1: Added Value of Using AS8506C Benefits Features Reduce filter / synchronization effort Simultaneous cell voltage capture for safe operating Acquired data have same time stamp to area (SOA) monitoring and balancing inherently generate accurate comparison results independent from load transients Strongly reduces data communication and data processing and thereby improves EMC Autonomous balancing and SOA monitoring robustness To compensate accumulative charge differences only. This mitigates cases of occasional wrong Autonomous passive balancing in the 100 mA range balance decisions due to flat OCV characteristic or mismatch in cell temperature Intrinsic inter module balancing through charge redistribution, efficiency improvement in case of Option for active charge balancing with very few leakage path due to defect induced leakage in external components particular cells For OCV capture, cell impedance calculation, Absolute cell voltage read out, read out of two diagnosis temperature sensors 40-pin MLF (6x6) package, very low number of Small form factor, low BOM external components Applications The applications of AS8506C include: The AS8506C is ideal for simultaneous cell monitoring and cell balancing in stacked energy storage systems. Current levels in the 100 mA range enables to compensate accumulative SOC mismatch over the entire cell pack. Typical applications are: Li-Ion batteries up to 200 cells Energy storage systems to buffer energy from PV panels or for emergency power supplies Battery management for e-scooters and e-bikes Page 2 ams Datasheet (discontinued) Document Feedback v1-05 2017-Jun-23