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14-Channel High-Voltage, ASIL D, Data-Acquisition System with Integrated Current-Sense Amplifier

Industries Leading ASIL D Battery Monitor ASIC with Current Sensing

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Key Features

  • AECQ-100 Grade 1 Temp. Range -40°C to 125°C
  • 65V Operating Voltage
  • Ultra-Low-Power Operation
    • Standby Mode: 2mA
    • Shutdown Mode: 2µA
  • Redundant ADC and Comparator Acquisitions
  • Simultaneous Cell and Bus-Bar Voltage Acquisitions
  • 14 Cell-Voltage Measurement Channels
    • 1mV Accuracy (3.6V, 25°C)
    • 2mV Accuracy (5°C to 40°C)
    • 4.5mV Accuracy (-40°C to 125°C)
  • 14 Cell-Balancing Switches
    • > 300mA Software-Programmable Balancing Current
    • Optimized Driving (AUTOBALSWDIS) and Parking Balancing Modes
    • Automated Balancing with Individual Cell Timers
    • Automated Balancing by Cell Voltage
    • Emergency Discharge Mode
  • Low-Noise Current-Sense Amplifier
    • 5mA resolution (Gain = 256)
  • Four Configurable Auxiliary Inputs for Temperature, Voltage, or GPIO
  • Integrated Die Temperature Measurement
  • Automatic Thermal Protection
  • Individually Configurable Safety Alert
    • Overvoltage, Undertemperature and Undervoltage, Overtemperature Faults
    • One Cell-Mismatch Alert
  • Support ASIL-D Requirements for Cell Voltage, Temperature, Current, Communication
  • Selectable UART, Dual UART, or SPI Interface
  • Battery-Management UART Protocol
    • Daisy-Chain Up to 32 Devices
    • Capacitive Communication-Port Isolation
    • Up to 2 Mbps Baud Rate (auto-detect)
    • 1.5µs Propagation Delay (per device)
    • Packet-Error Checking (PEC)
  • I2C Master
  • Configurable Hardware-Alert Interfaces
  • Factory-Trimmed Oscillator (No External Crystals Required)
  • 32-Bit Unique Device ID
  • 64-Pin (10mm x 10mm) LQFP Packagenn

Applications/Uses

  • 48V system
  • Battery Backup Systems (UPS)
  • Battery Powered Tools
  • Electric Bikes
  • Electric Vehicles (EV)
  • High Voltage Battery Stacks
  • Hybrid Electric Vehicles (HEV's)
  • Super-Cap Systems

Description

The MAX17852 is a flexible data-acquisition system for the management of high-voltage and low-voltage battery modules. The system can measure 14 cell voltages, one current measurement, and a combination of four temperatures or system voltages with fully redundant measurement engines in 263µs, or perform all inputs solely with the ADC measurement engine in 156µs. There are 14 internal switches rated for > 300mA for cell-balancing, each supporting extensive built-in diagnostics. Up to 32 devices can be daisy-chained to manage 448 cells and monitor 128 temperatures.

Cell and bus-bar voltages ranging from -2.5V to +5V are measured differentially over a 65V common-mode range, with a typical accuracy of 1mV (3.6V cell, 25°C). If oversampling is enabled, up to 128 measurements per channel can be averaged internally with 14-bit resolution and combined with digital post-processing IIR filtering for increased noise immunity. The system can shut itself down in the event of a thermal overload by measuring its own die temperature.

For robust communications, the system uses Maxim’s battery- management UART or SPI protocol for robust communications and supports an I2C master interface for external device control, and is optimized to support a reduced feature set of internal diagnostics and rapid-alert communication through both embedded communication and hardware-alert interfaces to support ASIL-D and FMEA requirements.

Simplified Block Diagram

MAX17852: Typical Application Circuit MAX17852: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .