Multicell Battery Monitors
Features and Benefits
- Measures Up to 12 Battery Cells in Series
- Stackable Architecture
- Supports Multiple Battery Chemistries and Supercapacitors
- Individually Addressable Serial Interface
- 0.25% Maximum Total Measurement Error
- Engineered for ISO26262 Compliant Systems
- 13ms to Measure All Cells in a System
- Passive Cell Balancing:
- Integrated Cell Balancing MOSFETs
- Ability to Drive External Balancing MOSFETs
- On-board Temperature Sensor and Thermistor Inputs
- 1MHz Serial Interface with Packet Error Checking
- Safe with Random Connection of Cells
- Built-In Self Tests
- Delta-Sigma Converter With Built-In Noise Filter
- Open-Wire Connection Fault Detection
- 12μA Standby Mode Supply Current
- High EMI Immunity
- 44-Lead SSOP Package
The LTC6803 is a 2nd generation, complete battery monitoring IC that includes a 12-bit ADC, a precision voltage reference, a high voltage input multiplexer and a serial interface. Each LTC6803 can measure up to 12 series connected battery cells or supercapacitors. Many LTC6803 devices can be stacked to measure the voltage of each cell in a long battery string. Each LTC6803-2/LTC6803-4 has an individually addressable serial interface, allowing up to 16 LTC6803-2/LTC6803-4 devices to interface to one control processor and operate simultaneously. Each cell input has an associated MOSFET switch for discharging overcharged cells. The LTC6803-2 connects the bottom of the stack to V– internally. It is pin compatible with the LTC6802-2, providing a drop-in upgrade. The LTC6803-4 separates the bottom of the stack from V–, improving cell 1 measurement accuracy.
The LTC6803 provides a standby mode to reduce supply current to 12μA. Furthermore, the LTC6803 can be powered from an isolated supply, providing a technique to reduce battery stack current draw to zero.
The related LTC6803-1 and LTC6803-3 offer a serial interface that allows the serial ports of multiple LTC6803-1 or LTC6803-3 devices to be daisy chained without optocouplers or isolators.
|SPI Interface||Isolated V–||LTC6802 Pin Compatible|
- Electric and Hybrid Electric Vehicles
- High Power Portable Equipment
- Backup Battery Systems
- Electric Bicycles, Motorcycles, Scooters
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (3)
Evaluation circuit DC1835A is a Battery Monitoring System to demonstrate the functional operation of the LTC6803-4 integrated circuit. The design includes the ability to bus up to 10 devices with built-in board-toboard ribbon-cable interconnects and selectively apply resistive loading to any cell for purposes of “Passive Balancing.” Additionally, the board includes a DC-DC boost conversion section to power the IC from an isolated external 5V supply. The external 5V supply also powers a data isolator so that the user SPI data bus is floating with respect to the monitored cells.
Tools & Simulations
Product Selector Card (1)
Product Selection Guide (1)
Technical Articles (1)
Press Release (1)
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Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.