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12-Channel High-Voltage Data Acquisition System

Meets Toughest Automotive and Industrial OEM Requirements for Safety, Performance, and Reliability

Product Details

The MAX17823B is a data acquisition system for the management of high-voltage battery modules. The system features 12-bit SAR ADC that can measure 12 cell voltages and two temperatures in 161μs. There are 12 internal switches for cell balancing and extensive built-in diagnostics. Up to 32 devices can be daisy-chained together to manage 384 cells and monitor 64 temperatures.

Cell voltages (0 to 5V) are measured differentially over a 65V common-mode range. Cell measurements have a typical accuracy of 2mV (3.6V cell, +25°C). If oversampling is enabled, up to 128 measurements per channel can be averaged internally with 14-bit resolution. The system can shut itself down in the event of a thermal overload by measuring its own die temperature.

The system uses Maxim’s battery-management UART protocol for robust communications and when used in conjunction with the MAX17880 12-channel battery monitor, they are ideal for automotive battery-management systems that require a high safety integrity level.

Key Features

  • AEC-Q100 Grade 2 Temperature Range
    • -40°C to +105°C
  • Operating Voltage from 9V to 65V
  • Ultra-Low-Power Operation
    • Standby Mode: 2mA
    • Shutdown Mode: 2μA
  • 12 Cell-Voltage-Measurement Channels
    • 2mV Accuracy (3.6V, +25° C)
    • 5mV Accuracy (0°C to +45°C)
    • 10mV Accuracy (-40°C to +105°C)
  • 12 Cell-Balancing Switches
    • Up to 150mA per Switch
    • Emergency-Discharge Mode
  • Two Temperature-Measurement Channels
  • Die Temperature Measurement
  • Automatic Thermal Protection
  • 29 Voltage Threshold Alerts
    • 12 Over-Voltage Faults
    • 12 Under-Voltage Faults
    • Two Over-Temperature Faults
    • Two Under-Temperature Faults
    • One Cell Mismatch Alert (highest cell versus lowest cell)
  • Four GPIOs
  • Built-in Diagnostics to Support ASIL D and FMEA Requirements
  • Battery-Management UART Protocol
    • Daisy-Chain Up to 32 Devices
    • Communication Port Isolation
    • Up to 2Mbps Baud Rate (Autodetect)
    • 1.5&micros Propagation Delay per Device
    • Packet-Error Checking (PEC)
  • Factory-Trimmed Oscillators
    • No External Crystals Required
  • 10mm x 10mm Package (64-Pin LQFP)

Applications/Uses

  • Battery Packs
  • Battery Systems
  • Electric Bikes
  • Electric Vehicles and Hybrid Vehicle (HEV)
  • High-Power Battery Backup Systems
  • High-Voltage, Multi-Cell Series-Stacked-
  • Power Tools
  • SuperCap Backup 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 UART
Parameters Measured Current
Temperature
Voltage
Applications Host
Pack
Battery Protection Features Over Voltage
Over-Current
Over/Under Voltage
VSUPPLY (V) (min) 9
VSUPPLY (V) (max) 65
Package/Pins LQFP/64
Oper. Temp. (°C) -40 to +105
Budgetary
Price (See Notes)
$6.33 @1k
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Simplified Block Diagram

MAX17823B: Functional Block Diagram MAX17823B: Functional Block Diagram Zoom icon

Technical Docs

Design & Development

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Support & Training

Search our knowledge base for answers to your technical questions.

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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 UART
Parameters Measured Current
Temperature
Voltage
Applications Host
Pack
Battery Protection Features Over Voltage
Over-Current
Over/Under Voltage
VSUPPLY (V) (min) 9
VSUPPLY (V) (max) 65
Package/Pins LQFP/64
Oper. Temp. (°C) -40 to +105
Budgetary
Price (See Notes)
$6.33 @1k

Key Features

  • AEC-Q100 Grade 2 Temperature Range
    • -40°C to +105°C
  • Operating Voltage from 9V to 65V
  • Ultra-Low-Power Operation
    • Standby Mode: 2mA
    • Shutdown Mode: 2μA
  • 12 Cell-Voltage-Measurement Channels
    • 2mV Accuracy (3.6V, +25° C)
    • 5mV Accuracy (0°C to +45°C)
    • 10mV Accuracy (-40°C to +105°C)
  • 12 Cell-Balancing Switches
    • Up to 150mA per Switch
    • Emergency-Discharge Mode
  • Two Temperature-Measurement Channels
  • Die Temperature Measurement
  • Automatic Thermal Protection
  • 29 Voltage Threshold Alerts
    • 12 Over-Voltage Faults
    • 12 Under-Voltage Faults
    • Two Over-Temperature Faults
    • Two Under-Temperature Faults
    • One Cell Mismatch Alert (highest cell versus lowest cell)
  • Four GPIOs
  • Built-in Diagnostics to Support ASIL D and FMEA Requirements
  • Battery-Management UART Protocol
    • Daisy-Chain Up to 32 Devices
    • Communication Port Isolation
    • Up to 2Mbps Baud Rate (Autodetect)
    • 1.5&micros Propagation Delay per Device
    • Packet-Error Checking (PEC)
  • Factory-Trimmed Oscillators
    • No External Crystals Required
  • 10mm x 10mm Package (64-Pin LQFP)

Applications/Uses

  • Battery Packs
  • Battery Systems
  • Electric Bikes
  • Electric Vehicles and Hybrid Vehicle (HEV)
  • High-Power Battery Backup Systems
  • High-Voltage, Multi-Cell Series-Stacked-
  • Power Tools
  • SuperCap Backup Systems

Description

The MAX17823B is a data acquisition system for the management of high-voltage battery modules. The system features 12-bit SAR ADC that can measure 12 cell voltages and two temperatures in 161μs. There are 12 internal switches for cell balancing and extensive built-in diagnostics. Up to 32 devices can be daisy-chained together to manage 384 cells and monitor 64 temperatures.

Cell voltages (0 to 5V) are measured differentially over a 65V common-mode range. Cell measurements have a typical accuracy of 2mV (3.6V cell, +25°C). If oversampling is enabled, up to 128 measurements per channel can be averaged internally with 14-bit resolution. The system can shut itself down in the event of a thermal overload by measuring its own die temperature.

The system uses Maxim’s battery-management UART protocol for robust communications and when used in conjunction with the MAX17880 12-channel battery monitor, they are ideal for automotive battery-management systems that require a high safety integrity level.

Simplified Block Diagram

MAX17823B: Functional Block Diagram MAX17823B: Functional Block Diagram 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