مدار مجتمع (آی سی) آی سی‌کاربرد ویژه

Product Attributes

Introduction

The MAX17854 is a flexible data-acquisition system for the management of high-voltage and low-voltage battery modules. The system can measure 14 cell voltages and a combination of six temperatures or system voltage measurements with fully redundant measurement engines in 162μs, or perform all inputs solely with the ADC measurement engine in 99μs. There are 14 internal balancing switches rated for >300mA for cell-balancing current, each supporting extensive built-in diagnostics. Up to 32 devices can be daisy-chained to manage 448 cells and monitor 192 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 100μV. 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. The system uses Analog Devices' battery-management UART 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.

Features

• 65V Operating Voltage
• Ultra-Low Power Operation
• Shutdown Mode: 2μA
• Redundant ADC and Comparator (COMP) Acquisitions
• Simultaneous Cell and Bus-Bar Voltage Acquisitions
• 14 Cell-Voltage Measurement Channels
  • 2.2mV Accuracy (-40°C to +125°C)
  • 1.8mV Accuracy (+5°C to +65°C)
• 14 Cell-Balancing Switches

  • 300mA Software-Programmable Balancing Current

  • Optimized Driving and Parking Balancing Modes
  • Automated Balancing with Individual Cell Timers
  • Automated Balancing by Cell Voltage
  • Emergency Discharge Mode
• Six Configurable Auxiliary Inputs for Temperature, Voltage, or GPIO
• Integrated Die Temperature Measurement
• Automatic Thermal Protection
• Individually Configurable Safety Alerts
  • Overvoltage, Undertemperature Faults
  • Undervoltage, Overtemperature Faults
  • 1-Cell Mismatch Alert
• I2C Master
• Configurable Hardware-Alert Interfaces
• 32-Bit Unique Device ID
• AEC-Q100 Grade 1
• Temperature Range -40°C to +125°C

Applications

• High-Voltage Battery Stacks
• Electric Vehicles (EVs)
• Hybrid Electric Vehicles (HEVs)
• Electric Bikes
• Battery-Backup Systems (UPS)
• Super-Cap Systems
• Battery-Powered Tools