12-Channel High-Voltage Data Acquisition System

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

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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.

MAX17823B: Functional Block Diagram MAX17823B: Functional Block Diagram Enlarge+

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)
    • 1.5µs Propagation Delay per Device
    • Packet-Error Checking (PEC)
  • Factory-Trimmed Oscillators
    • No External Crystals Required
  • 10mm x 10mm Package (64-Pin LQFP)


  • 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

See parametric specs for Battery Fuel Gauges, Protectors, and Monitors (52)

Part NumberFunctionsBattery TypeInterfaceParameters MeasuredApplicationsBattery ProtectionVSUPPLY
Package/PinsOper. Temp.
minmaxSee Notes
MAX17823B NEW!Status Monitor
1-12 Cell Li-Ion
3-16 Cell Li-Ion
Multi-Cell Li-Ion
Over Voltage
Over/Under Voltage
-40 to +105$6.33 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX17823EVKIT: Evaluation Kit for the MAX17823B
Request Reliability Report for: MAX17823B 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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12-Channel High-Voltage Data Acquisition System

  • AEC-Q100 Grade 2 Temperature Range
  • Operating Voltage from 9V to 65V
  • Ultra-Low-Power Operation