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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

Product Details

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.

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
Parametric specs for Battery Fuel Gauges, Protectors, and Monitors
Functions Status Monitor
Battery Type 1-12 Cell Li-Ion
3-16 Cell Li-Ion
Multi-Cell Li-Ion
Interface SPI
UART
Parameters Measured Current
Temperature
Voltage
Applications Host
Pack
Battery Protection Features Over Voltage
Over-Current
Over-Temperature
Over/Under Voltage
VSUPPLY (V) (min) 9
VSUPPLY (V) (max) 65
Package/Pins LQFP/64
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
$7.52 @1k
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Simplified Block Diagram

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

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX17852 evaluation kit (EV kit) is used to demonstrate the features and capabilities of the MAX17852 14-channel high-voltage smart sensor data-acquisition interface IC. The EV kit is coupled with a MAX17841B EV kit to establish communication to a host PC. With communication established, control of the MAX17852 EV kit is executed through the EV kit graphical user interface (GUI) on the host PC. The GUI is Windows XP®, Windows Vista® Windows® 7, and Windows 10 compatible and is available through your local Maxim Integrated sales office. Note: References to the MAX17841 in this data sheet pertain equally to the MAX17841B as well.

The MAX17852 EV kit design provides a convenient platform for evaluating the features and functions of the IC, in addition to the IC’s electrical parameters. The EV kit with vertical communication connectors (P2, P3, P5, and P6) and snap and lock battery pack connector enable the user to quickly build and evaluate a system with up to 32 daisy-chain devices.

View Details

Features

  • Provides a Convenient Platform for Evaluating the Features and Functions of the MAX17852
  • Versatile GUI Interface for Features Evaluation
  • Plug-and-Play Architecture for Rapid System Prototyping
  • Force and Sense Pin Headers for Precision Measurement Assessment
  • Built-In Resistor Stack for Battery Emulation
  • Proven PCB Layout
  • Fully Assembled and Tested

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Parameters

Parametric specs for Battery Fuel Gauges, Protectors, and Monitors
Functions Status Monitor
Battery Type 1-12 Cell Li-Ion
3-16 Cell Li-Ion
Multi-Cell Li-Ion
Interface SPI
UART
Parameters Measured Current
Temperature
Voltage
Applications Host
Pack
Battery Protection Features Over Voltage
Over-Current
Over-Temperature
Over/Under Voltage
VSUPPLY (V) (min) 9
VSUPPLY (V) (max) 65
Package/Pins LQFP/64
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
$7.52 @1k

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