LTC6811-1/LTC6811-2 - Multicell Battery Monitors
Features
- Pin-Compatible Upgrade from the LTC6804
- Measures Up to 12 Battery Cells in Series
- 1.2mV Maximum Total Measurement Error
- Stackable Architecture Supports 100s of Cells
- Built-in isoSPITM Interface
- 1Mb Isolated Serial Communications
- Uses a Single Twisted Pair, up to 100 Meters
- Low EMI Susceptibility and Emissions
- 290μs to Measure All Cells in a System
- Synchronized Voltage and Current Measurement
- 16-Bit Delta-Sigma ADC with 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
Typical Application
Description
The LTC®6811 is a 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 LTC6811 suitable for most battery chemistries. All 12 cells can be measured in 290μs, and lower data acquisition rates can be selected for high noise reduction.
Multiple LTC6811 devices can be connected in series, permitting simultaneous cell monitoring of long, high voltage battery strings. Each LTC6811 has an isoSPI interface for high speed, RF-immune, long distance communications. Using the LTC6811-1, multiple devices are connected in a daisy chain with one host processor connection for all devices. Using the LTC6811-2, multiple devices are connected in parallel to the host processor, with each device individually addressed.
The LTC6811 can be powered directly from the battery stack or from an isolated supply. The LTC6811 includes passive balancing for each cell, with individual PWM duty cycle control for each cell. Other features include an onboard 5V regulator, five general purpose I/O lines and a sleep mode, where current consumption is reduced to 6μA.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC6811HG-1#PBF | SSOP-48 | G | H | 05-08-1887 | Yes |
| LTC6811HG-1#TRPBF | SSOP-48 | G | H | 05-08-1887 | Yes |
| LTC6811HG-2#PBF | SSOP-48 | G | H | 05-08-1887 | Yes |
| LTC6811HG-2#TRPBF | SSOP-48 | G | H | 05-08-1887 | Yes |
| LTC6811IG-1#PBF | SSOP-48 | G | I | 05-08-1887 | Yes |
| LTC6811IG-1#TRPBF | SSOP-48 | G | I | 05-08-1887 | Yes |
| LTC6811IG-2#PBF | SSOP-48 | G | I | 05-08-1887 | Yes |
| LTC6811IG-2#TRPBF | SSOP-48 | G | I | 05-08-1887 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC6811HG-1#PBF | SSOP-48 | H | $12.78 | $9.17 | Yes | |
| LTC6811HG-1#TRPBF | SSOP-48 | H | $12.84 | $9.23 | Yes | |
| LTC6811HG-2#PBF | SSOP-48 | H | $12.78 | $9.17 | Yes | |
| LTC6811HG-2#TRPBF | SSOP-48 | H | $12.84 | $9.23 | Yes | |
| LTC6811IG-1#PBF | SSOP-48 | I | $11.41 | $8.19 | Yes | |
| LTC6811IG-1#TRPBF | SSOP-48 | I | $11.47 | $8.25 | Yes | |
| LTC6811IG-2#PBF | SSOP-48 | I | $11.41 | $8.19 | Yes | |
| LTC6811IG-2#TRPBF | SSOP-48 | I | $11.47 | $8.25 | Yes | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC2259A | LTC6811-1 Demo Board | Multicell Battery Stack Monitor with Addressable isoSPI Interface | $150.00 | |
| DC2260A | LTC6811-2 Demo Board | Multicell Battery Stack Monitor with Addressable isoSPI Interface | $150.00 | |
| Buy Now | |||
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1907A | LTC6820 isoSPI 2-Wire Serial Analyzer | $150.00 | |
| DC2026C | Linduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform | $75.00 | |
| Buy Now | |||
Applications
- Electric and Hybrid Electric Vehicles
- Backup Battery Systems
- Grid Energy Storage
- High Power Portable Equipment
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- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
