DATASHEET ISL94212 FN7938 Rev 1.00 Multi-Cell Li-Ion Battery Manager April 23, 2015 The ISL94212 Li-ion battery manager IC supervises up to 12 Features series connected cells. The part provides accurate monitoring, Up to 12-cell voltage monitors, support Li-Ion CoO , Li-ion cell balancing and extensive system diagnostics functions. 2 Mn O , and Li-ion FePO4 chemistries Three cell balancing modes are provided: Manual Balancing 2 4 mode, Timed Balancing mode and Auto Balance mode. The Cell voltage measurement accuracy 10mV Auto Balance mode terminates balancing functions when a 13-bit cell voltage measurement charge transfer value has been met. Pack voltage measurement accuracy 180mV The ISL94212 communicates to a host microcontroller via an 14-bit pack voltage and temperature measurements SPI interface and to other ISL94212 devices using a robust, proprietary, two-wire Daisy Chain system. Cell voltage scan rate of 19.5s per cell (234s to scan 12 cells) The ISL94212 is offered in a 64 Ld TQFP package and is Internal temperature monitoring specified for an operational temperature range of -40C to +85C. Up to four external temperature inputs Robust daisy chain communications system Applications Integrated system diagnostics for all key internal functions Light electric vehicle (LEV) E-Moto E-Bike Hardwired and communications based fault notification Battery backup systems Energy Storage Systems (ESS) Integrated watchdog shuts down device if communication is Solar Farms lost Portable and semi-portable equipment 7A shutdown current: Enable = V SS 2Mbps SPI TO OTHER DEVICES (OPTIONAL) ISL94212 ISL94212 VG1 VG1 VG2 VG2 DHi2 DLo2 DHi2 DHi1 DLo2 DLo1 SCLK DOUT DIN HOST CS MICRO DATA READY FAULT EN VG1 VG1 VG2 MONITOR BOARD (Master or Standalone) MONITOR BOARD (Daisy Chain - Optional) FIGURE 1. TYPICAL APPLICATION FN7938 Rev 1.00 Page 1 of 96 April 23, 2015ISL94212 CRC Calculation 36 Table of Contents Daisy Chain Addressing 38 Ordering Information 4 Daisy Chain Commands . 40 Pin Configuration 4 Identify 40 Absolute Maximum Ratings . 7 ACK (Acknowledge) . 42 Thermal Information . 7 NAK (Not Acknowledge) 42 Recommended Operating Conditions 7 Reset . 42 Electrical Specifications . 7 Address All . 42 Timing Diagrams .14 Alarm Signals . 43 Typical Performance Curves .15 Watchdog Function . 43 Device Description and Operation 21 Communications Faults . 44 Power Modes 21 Communication Failure 44 Measurement Modes 21 Scan Counter . 45 Measurement Mode Commands 21 Daisy Chain Communications Conflicts 45 Scan Once .22 Memory Checksum . 45 Scan Voltages . 22 Settling Time Following Diagnostic Activity 45 Scan Temperatures 22 Open Wire Test . 45 Scan Mixed . 22 Cell Balancing 45 Scan Wires . 22 Fault Signal Filtering . 46 Scan All 22 Fault Diagnostics 46 Scan Continuous .23 Sleep Mode . 50 Measure .23 Wakeup . 50 Cell Voltage Measurement Accuracy 24 Fault Response in Sleep Mode 50 Temperature Monitoring .24 Communication and Measurement Diagrams 50 Cell Balancing Functions 25 Measurement Timing Diagrams . 51 Balance Setup Register 25 Command Timing Diagram . 52 Balance Status Register 26 Response Timing Diagrams 53 Manual Balance Mode . 26 Communication and Measurement Timing Tables 56 Timed Balance Mode . 27 Measurement Timing Tables 56 Auto Balance Mode 27 Command Timing Tables . 57 Balance FET Drivers 29 Response Timing Tables . 58 Device Setup Register 30 System Registers 62 Cell Balance Enabled Register . 30 Register Descriptions 62 System Configuration .31 Cell Voltage Data . 62 SPI Interface .31 Temperature Data, Secondary Voltage Reference Data, Scan Count . 62 Full Duplex Operation 31 Fault Registers . 63 Half Duplex Operation 32 Setup Registers . 66 Non-daisy Chain Systems 33 Cell Balance Registers . 69 Normal Communications . 33 Reference Coefficient Registers . 69 Alarm Signals . 33 Cells In Balance Register . 70 Communication Faults . 33 Device Commands 70 Fault Response in Sleep Mode . 34 Nonvolatile Memory (EEPROM) Checksum 71 Example Communications 34 Applications Circuits Information 72 Daisy Chain Systems 34 Typical Applications Circuits 72 Daisy Chain Ports 34 Typical Application Circuits 73 Communications Protocol 35 Notes on Board Layout . 77 Communication Sequences . 36 FN7938 Rev 1.00 Page 2 of 96 April 23, 2015