MAX17823HGCB/V+ Analog Devices

EVALUATION KIT AVAILABLE MAX17823H 12-Channel, High-Voltage Data-Acquisition Systems General Description Benefits and Features The MAX17823H are data-acquisition systems for the AECQ-100 Grade 2 Temperature Range management of high-voltage battery modules. The -40C to +105C systems feature a 12-bit SAR ADC that can measure Operating Voltage from 9V to 65V 12 cell voltages and two temperatures in 161s. There Ultra-Low Power Operation are 12 internal switches for cell balancing and extensive Standby Mode: 2mA built-in diagnostics. Up to 32 devices can be daisy- Shutdown Mode: 2A chained together to manage 384 cells and monitor 64 temperatures. 12 Cell-Voltage-Measurement Channels Cell voltages (0 to 5V) are measured differentially over 2mV Accuracy (3.6V, +25C) a 65V common-mode range. Cell measurements have a 5mV Accuracy (0C to +45C) typical accuracy of 2mV (3.6V cell, +25C). If oversam- 10mV Accuracy (-40C to +105C) pling is enabled, up to 128 measurements per channel 12 Cell-Balancing Switches can be averaged internally with 14-bit resolution. The sys- Up to 650mA per Switch tem can shut itself down in the event of a thermal overload Emergency-Discharge Mode by measuring its own die temperature. Two Temperature-Measurement Channels The systems use Maxims battery-management UART Die Temperature Measurement protocol for robust communications and when used in conjunction with the MAX17880 12-channel battery moni- Automatic Thermal Protection tor, they are ideal for automotive battery-management 29 Voltage Threshold Alerts systems that require a high safety-integrity level. 12 Overvoltage Faults 12 Undervoltage Faults Applications Two Overtemperature Faults High-Voltage Battery Stacks Two Undertemperature Faults Electric Vehicles (EVs) One Cell-Mismatch Alert Hybrid Electric Vehicles (HEVs) (Highest Cell vs. Lowest Cell) Electric Bikes Battery-Backup Systems (UPS) Four GPIOs Super-Cap Systems Built-in Diagnostics to Support ASIL D and Battery-Powered Tools FMEA Requirements Battery-Management UART Protocol Ordering Information appears at end of data sheet. Daisy-Chain Up to 32 Devices Communication Port Isolation Up to 2Mbps Baud Rate (Autodetect) 1.5s Propagation Delay per Device Packet-Error Checking (PEC) Factory-Trimmed Oscillators No External Crystals Required 10mm x 10mm Package (64-Pin LQFP) 19-100391 Rev 0 8/18MAX17823H 12-Channel, High-Voltage Data-Acquisition Systems TABLE OF CONTENTS General Description ............................................................................ 1 Applications .................................................................................. 1 Benefits and Features .......................................................................... 1 Simplified Operating Circuit ......................................................................11 Absolute Maximum Ratings ..................................................................... 12 Electrical Characteristics ....................................................................... 12 Typical Operating Characteristics ................................................................ 18 Pin Configuration ............................................................................. 19 Pin Description ............................................................................... 20 Detailed Description........................................................................... 23 Data Conventions . 27 Data Acquisition 27 Precision Internal Voltage References . 27 Measurement Calibration . 27 Cell Inputs . 28 Input Range 28 Block Voltage Input 29 Auxiliary Inputs . 29 THRM Output 30 Computing Temperature 30 Temperature Alerts 30 Die Temperature Measurement 30 Die Temperature Alert 31 Acquisition Mode 31 Oversampling 31 Acquisition Watchdog Timeout . 31 Scan Modes . 33 Acquisition Time 34 Measurement Data Transfer . 34 Double-buffer Mode . 35 Measurement Alerts . 37 Voltage Alerts 37 Cell Mismatch 37 Cell Statistics 37 Temperature Alerts 38 Cell Balancing 38 Cell-Balancing Switches . 38 Maxim Integrated 2 www.maximintegrated.com