Click here to ask about the production status of specific part numbers. MAX17852 14-Channel High-Voltage, ASIL D, Data-Acquisition System with Integrated Current-Sense Amplifier General Description Benefits and Features The MAX17852 is a flexible data-acquisition system for AECQ-100 Grade 1 Temp. Range -40C to 125C the management of high-voltage and low-voltage battery 65V Operating Voltage modules. The system can measure 14 cell voltages, one Ultra-Low-Power Operation current measurement, and a combination of four temper- Standby Mode: 2mA atures or system voltages with fully redundant measure- Shutdown Mode: 2A ment engines in 263s, or perform all inputs solely with Redundant ADC and Comparator Acquisitions the ADC measurement engine in 156s. There are 14 in- Simultaneous Cell and Bus-Bar Voltage Acquisitions ternal switches rated for > 300mA for cell-balancing, each 14 Cell-Voltage Measurement Channels supporting extensive built-in diagnostics. Up to 32 devices 1mV Accuracy (3.6V, 25C) can be daisy-chained to manage 448 cells and monitor 2mV Accuracy (5C to 40C) 128 temperatures. 4.5mV Accuracy (-40C to 125C) Cell and bus-bar voltages ranging from -2.5V to +5V are 14 Cell-Balancing Switches measured differentially over a 65V common-mode range, > 300mA Software-Programmable Balancing with a typical accuracy of 1mV (3.6V cell, 25C). If over- Current sampling is enabled, up to 128 measurements per chan- Optimized Driving (AUTOBALSWDIS) and Parking nel can be averaged internally with 14-bit resolution and Balancing Modes combined with digital post-processing IIR filtering for in- Automated Balancing with Individual Cell Timers creased noise immunity. The system can shut itself down Automated Balancing by Cell Voltage in the event of a thermal overload by measuring its own Emergency Discharge Mode die temperature. Low-Noise Current-Sense Amplifier For robust communications, the system uses Maxims bat- 5mA resolution (Gain = 256) tery-management UART or SPI protocol for robust com- 2 munications and supports an I C master interface for ex- Four Configurable Auxiliary Inputs for Temperature, ternal device control, and is optimized to support a re- Voltage, or GPIO duced feature set of internal diagnostics and rapid-alert Integrated Die Temperature Measurement communication through both embedded communication Automatic Thermal Protection and hardware-alert interfaces to support ASIL-D and Individually Configurable Safety Alert FMEA requirements. Overvoltage, Undertemperature and Undervoltage, Overtemperature Faults Applications One Cell-Mismatch Alert High-Voltage Battery Stacks Support ASIL-D Requirements for Cell Voltage, Electric Vehicles (EVs) Temperature, Current, Communication Hybrid Electric Vehicles (HEVs) Selectable UART, Dual UART, or SPI Interface Electric Bikes Battery-Management UART Protocol Battery-Backup Systems (UPS or ESS) Daisy-Chain Up to 32 Devices Super-Cap Systems Capacitive Communication-Port Isolation Battery-Powered Tools Up to 2 Mbps Baud Rate (auto-detect) 1.5s Propagation Delay (per device) Packet-Error Checking (PEC) 2 I C Master Configurable Hardware-Alert Interfaces Factory-Trimmed Oscillator (No External Crystals Required) 32-Bit Unique Device ID 64-Pin (10mm x 10mm) LQFP Package Ordering Information appears at end of datasheet. 19-100902 Rev 0 12/20MAX17852 14-Channel High-Voltage, ASIL D, Data-Acquisition System with Integrated Current-Sense Amplifier MAX17852 Simplified Application Diagrams SPI Interface with Single-Ended Alert 4.7F MODULE N+1 50V 10 CELL STACK 100 HV DCIN CPP 2.2F VAA 0.1F 100V MAX17852 CPN 100V 10k UARTSEL SHDNL VBLK 1.0NF VAA BLOCK FILTER 25V 1.0F NETWORK (OPTIONAL) AGND VDDL1 0.47F GNDL1 C14 VDDL2 SW14 0.47F CELL 14 C13 GNDL2 SW13 VDDL3 0.47F C12 GNDL3 SW12 CELL 13 UART DAISY-CHAIN FROM C11 UPPER MODULE OR SYSTEM SW11 CONTROLLER C10 MAX1785x CELL 12 UPPER UART SW10 TXUP RXLP INTERFACE TXUN RXLN C9 SW9 RXUP TXLP C8 RXUN TXLN MODULE N+1 SW8 C7 CELL INPUT FILTER UART DAISY-CHAIN FROM SW7 NETWORK LOWER MODULE OR C6 SYSTEM CONTROLLER CELL 4 SW6 MAX1785x C5 TXLP LOWER UART RXUP TXLN INTERFACE RXUN SW5 CELL 3 C4 RXLP TXUP SW4 RXLN TXUN MODULE N-1 C3 SW3 CELL 2 ALERTIN MODULE N+1 ALERT INTERFACE C2 (OPTIONAL) ALERTOUT MODULE N-1 SW2 THRM C1 CELL 1 SW1 AUXIN0/GPIO0/SDA AUXILLARY /GPIO/ C0 AUXIN1/GPIO1/SCL ABSOLUTE NTC NETWORK AUXIN2/GPIO2 MEASUREMENT SW0 AUXIN3/GPIO3 CIRCUIT AGND CSAP CURRENT FILTER NETWORK CSAN AUXGND CAPACITOR RATINGS SHOWN IN THIS DATASHEET ARE BASED ON MODULE N-1 CELL STACK EXPECTED REFERENCE CIRCUIT CONDITIONS AND MAY BE MODIFIED OR CELL STACK GROUND BASED ON FINAL APPLICATION REQUIREMENTS. www.maximintegrated.com Maxim Integrated 2 BUS BAR RSENSE BUS BAR MODULE-(N) MODULE+(N)