LTC6804-1

NOT RECOMMENDED FOR NEW DESIGNS

12 Channel Multicell Battery Monitor with Daisy Chain Interface, Generation 3

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Overview

  • Measures Up to 12 Battery Cells in Series
  • Stackable Architecture Supports 100s of Cells
  • Built-In isoSPI™ Interface:
    • 1Mbps Isolated Serial Communications
    • Uses a Single Twisted Pair, Up to 100 Meters
    • Low EMI Susceptibility and Emissions
  • 1.2mV Maximum Total Measurement Error
  • 290μs to Measure All Cells in a System
  • Synchronized Voltage and Current Measurement
  • 16-Bit Delta-Sigma ADC with Frequency Programmable 3rd Order Noise Filter
  • Engineered for ISO26262 Compliant Systems
  • Passive Cell Balancing with Programmable Timer
  • 5 General Purpose Digital I/O or Analog Inputs:
    • Temperature or other Sensor Inputs
    • Configurable as an I2C or SPI Master
  • 4μA Sleep Mode Supply Current
  • 48-Lead SSOP Package

The LTC6804 is a 3rd generation multicell battery stack monitor that measures up to 12 series connected battery cells with a total measurement error of less than 1.2mV. The cell measurement range of 0V to 5V makes the LTC6804 suitable for most battery chemistries. All 12 cell voltages can be captured in 290μs, and lower data acquisition rates can be selected for high noise reduction.

Multiple LTC6804 devices can be connected in series, permitting simultaneous cell monitoring of long, high voltage battery strings. Each LTC6804 has an isoSPI interface for high speed, RF-immune, local area communications. Using the LTC6804-1, multiple devices are connected in a daisy-chain with one host processor connection for all devices. Using the LTC6804-2, multiple devices are connected in parallel to the host processor, with each device individually addressed.

Additional features include passive balancing for each cell, an onboard 5V regulator, and 5 general purpose I/O lines. In sleep mode, current consumption is reduced to 4μA. The LTC6804 can be powered directly from the battery, or from an isolated supply.

Applications

  • Electric and Hybrid Electric Vehicles
  • Backup Battery Systems
  • Grid Energy Storage
  • High Power Portable Equipment
LTC6804-1
12 Channel Multicell Battery Monitor with Daisy Chain Interface, Generation 3
Total Measurement Error vs Temperature of 5 Typical Units Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 4

Technical Articles 4

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

Evaluation Software 1

LTC6804 GUI Demoboard Software

 

Hardware Ecosystem

Parts Product Life Cycle Description
Analog to Digital Converters (ADCs) 1
LTC2983
RECOMMENDED FOR NEW DESIGNS Multi-Sensor High Accuracy Digital Temperature Measurement System
Battery Monitors & Fuel Gauges 2
LT8584
RECOMMENDED FOR NEW DESIGNS 2.5A Monolithic Active Cell Balancer with Telemetry Interface
LTC3300-1
RECOMMENDED FOR NEW DESIGNS High Efficiency Bidirectional Multicell Battery Balancer
Interface Transceivers & Isolators 1
LTC6820
PRODUCTION isoSPI Isolated Communications Interface
Protection Switches & Controllers 1
LTM9100
PRODUCTION Anyside™ High Voltage Isolated Switch Controller with I2C Command and Telemetry
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Tools & Simulations

Linduino 6

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC1941D

LTC6820 isoSPI Demoboard (DC590B required)

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Product Details

Demonstration circuit 1941 is an isoSPI™ transceiver board, based on Linear Technology’s LTC6820. The LTC6820 provides a method of interconnecting standard serial peripheral interface (SPI) devices using a single twisted pair connection. This proprietary 2-wire interface is called isoSPI. The LTC6820 encodes SPI signals, up to 1Mbps, into a differential isoSPI signal which is transmitted via a simple pulse transformer through a twisted pair. At the other end of the twisted pair, the isoSPI signal can be translated back to SPI (using another LTC6820).


 


eval board
schematic 6
schematic 7
schematic 8
schematic 9
schematic 10
DC1894B

LTC6804-1 Demo Board | 12-Channel Battery Stack Monitor with Daisy-chain Interface

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Product Details

Demonstration circuit 1894B is a daisy-chainable isoSPI battery-stack monitor featuring the LTC6804-1. These boards can be linked through a 2-wire isolated serial interface to monitor any number of cells on a stack.


 
DC1941D
LTC6820 isoSPI Demoboard (DC590B required)
DC1941D Demo Board DC1941D Demo Board DC1941D Demo Board DC1941D Demo Board DC1941D - Schematic
DC1894B
LTC6804-1 Demo Board | 12-Channel Battery Stack Monitor with Daisy-chain Interface
DC1894B Demo Board DC1894B Demo Board DC1894B Demo Board DC1894B Demo Board DC1894B - Schematic

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