LTC6804-2

NOT RECOMMENDED FOR NEW DESIGNS

12 Channel Multicell Battery Monitor with Addressable 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
LTC6804-2
12 Channel Multicell Battery Monitor with Addressable 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

Data Sheet

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Evaluation Kits

eval board
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DC2100B-D

12 Cell 4A Stackable Slave Bidirectional Active Cell Balancer Featuring LTC6804-2 and LTC3300-1(x2)

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Product Details

Demonstration Circuit DC2100B-D is a stackable, bidirectional cell balancer slave board using the LTC6804-2 and the LTC3300-1 ICs to achieve active balancing of up to 12 Li-Ion cells. It requires the DC2100B-C for proper operation. The DC2100B-D uses a single LTC6804-2 Multi-Cell Addressable Battery Stack Monitor IC to measure cell voltages and two LTC3300-1 Synchronous Flyback ICs to provide active cell balancing. The DC2100B-C controller board contains a PIC18F47J53 microcontroller, the LTM2884 isolated USB transceiver, the LTC6804-2, two LTC3300-1 ICs, and the LTC6820 isoSPI Interface IC to facilitate isolated communication. Up to seven DC2100B-D boards can be connected to a DC2100B-C to build a stacked system of eight total boards.

eval board
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DC1942C

LTC6804-2 Demo Board | Addressable isoSPI Battery-Stack Monitor (DC2026)

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Product Details

Demonstration circuit 1942C is an addressable isoSPI battery-stack monitor featuring the LTC6804-2. These boards can be linked through a 2-wire isolated serial interface to monitor any number of cells on a stack. Communication to a PC uses a DC590 USB interface board. A control program for up to ten stacked boards has a Graphical User Interface (GUI) to implement the device command set.



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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).


 


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DC2100B-C

12 Cell 4A Controller Board Bi-Directional Active Cell Balancer with LTC3300-1, LTC6804-2 and LTC6820

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Product Details

Demonstration Circuit DC2100B-D is a stackable, bidirectional cell balancer slave board using the LTC6804-2 and the LTC3300-1 ICs to achieve active balancing of up to 12 Li-Ion cells. It requires the DC2100B-C for proper operation. The DC2100B-D uses a single LTC6804-2 Multi-Cell Addressable Battery Stack Monitor IC to measure cell voltages and two LTC3300-1 Synchronous Flyback ICs to provide active cell balancing. The DC2100B-C controller board contains a PIC18F47J53 microcontroller, the LTM2884 isolated USB transceiver, the LTC6804-2, two LTC3300-1 ICs, and the LTC6820 isoSPI Interface IC to facilitate isolated communication. Up to seven DC2100B-D boards can be connected to a DC2100B-C to build a stacked system of eight total boards.

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DC2100A-C

OBSOLETE: 12 Cell 4A Controller Board Featuring LTC6804-2 and LTC3300-1 (x2) for Bidirectional Active Cell Balancing

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Product Details

This evaluation board is obsolete and no longer recommended. The replacement board is the DC2100B-C.

Demonstration Circuit DC2100A-C is a stand-alone Active Cell Balancer for balancing up to 12 Li-Ion cells; it also is the master controller board when used with DC2100B-D slave boards for a stackable battery balancing solution. It consists of the LTC6804-2 Multicell Addressable Battery Stack Monitor and two LTC3300-1 Active Cell Balancers. It contains a PIC18F47J53 microcontroller, the LTM2884 Isolated USB Transceiver, and an LTC6820 isoSPI Interface IC to facilitate isolated communication with the LTC6804-2 and the LTC3300-1 ICs. Up to 7 DC2100B-D boards can be connected to the DC2100A-C to build a stacked system of 8 total boards.

eval board
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DC2100A-D

OBSOLETE: 12 Cell 4A Stackable Slave Bidirectional Active Cell Balancer Featuring LTC6804-2 and LTC3300-1(x2)

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Product Details

This evaluation board is obsolete and no longer recommended. The replacement board is the DC2100B-D.

Demonstration Circuit DC2100A-D is a stackable, bidirectional cell balancer slave board using the LTC6804-2 and the LTC3300-1 ICs to achieve active balancing of up to 12 Li-Ion cells. It requires the DC2100A-C for proper operation. The DC2100B-D uses a single LTC6804-2 Multi-Cell Addressable Battery Stack Monitor IC to measure cell voltages and two LTC3300-1 Synchronous Flyback ICs to provide active cell balancing. The DC2100A-C controller board contains a PIC18F47J53 microcontroller, the LTM2884 isolated USB transceiver, the LTC6804-2, two LTC3300-1 ICs, and the LTC6820 isoSPI Interface IC to facilitate isolated communication. Up to seven DC2100A-D boards can be connected to a DC2100A-C to build a stacked system of eight total boards.
DC2100B-D
12 Cell 4A Stackable Slave Bidirectional Active Cell Balancer Featuring LTC6804-2 and LTC3300-1(x2)
DC2100B-D Demo Board DC2100B-D Demo Board DC2100B-D Demo Board DC2100B-D Demo Board DC2100B-D Demo Board DC2100B-D Demo Board DC2100B - Demo Board Image DC2100B - Schematic
DC1942C
LTC6804-2 Demo Board | Addressable isoSPI Battery-Stack Monitor (DC2026)
DC1942C Demo Board DC1942C Demo Board DC1942C Demo Board DC1942C Demo Board DC1942C - Schematic
DC1941D
LTC6820 isoSPI Demoboard (DC590B required)
DC1941D Demo Board DC1941D Demo Board DC1941D Demo Board DC1941D Demo Board DC1941D - Schematic
DC2100B-C
12 Cell 4A Controller Board Bi-Directional Active Cell Balancer with LTC3300-1, LTC6804-2 and LTC6820
DC2100B-C Demo Board DC2100B-C Demo Board DC2100B-C Demo Board DC2100B-C Demo Board DC2100B-C Demo Board DC2100B-C Demo Board DC2100B - Demo Board Image DC2100B - Schematic
DC2100A-C
OBSOLETE: 12 Cell 4A Controller Board Featuring LTC6804-2 and LTC3300-1 (x2) for Bidirectional Active Cell Balancing
DC2100A - Schematic
DC2100A-D
OBSOLETE: 12 Cell 4A Stackable Slave Bidirectional Active Cell Balancer Featuring LTC6804-2 and LTC3300-1(x2)
DC2100A - Schematic

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