Features and Benefits
- Measures Battery Stack Voltage, Current and Power
- Indicates Accumulated Battery Charge and Energy
- 20-Bit Current Measurement with <1μV Offset
- Built-In Isolated isoSPI™ or SPI Interface
- LTC68xx/ADBMS68xx Compatible, Supports Synchronous Measurements with Cell Monitors
- Up to 12 Buffered Voltage Measurement Inputs
- Up to 5 GPIOs, Configurable to Drive Ground, Supply or Toggling at 400kHz
- High or Low Side Current Sense
- 0.3% Current and Voltage Accuracy
- 1% Energy and Charge Accuracy
- True Average ADCs
- I2C EEPROM Interface to Store Board Calibration Factors
- Threshold Registers for all Measured Quantities
- Engineered for ISO26262 Compliant Systems
- Open Wire Detection on Input Pins
- Available in 48-Lead LQFP Package
- AEC-Q100 Qualified for Automotive Applications
The LTC2949 is a high precision current, voltage, temperature, charge and energy meter for electrical and hybrid vehicles and other isolated current sense applications. It infers charge and energy flowing in and out of the battery pack by monitoring simultaneously the voltage drop over up to two sense resistors and the battery pack voltage.
Low offset ΔΣ ADCs ensure accurate measurement of voltage and current with insignificant power loss. Continuous integration of current and power ensures lossless tracking of charge and energy delivered or received by the battery pack.
The built-in serial interface can be configured to support isolated isoSPI communication to the host or as SPI interface.
The LTC2949 features 12 internally buffered high impedance inputs (V1 to V12) for measuring voltages from external sensors or resistor dividers allowing to measure temperatures, HV-Link voltages, chassis isolation and supervise contactor states. LTC2949 has up to five programmable digital outputs which can be set to ground, supply or toggling at 400kHz.
Programmable threshold and tracking registers reduce digital traffic to the host.
- Electric and Hybrid Vehicles
- Isolated Current Sensing
- Backup Battery Systems
- High Power Portable Equipment
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 (2)
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).
The DC2732A demonstrates a high voltage battery pack monitor based on the LTC2949. The LTC2949 is a high precision current, voltage, temperature, charge and energy meter for electrical and hybrid vehicles and other isolated current sense applications. It infers charge and energy flowing in and out of the battery pack by simultaneously monitoring the voltage across two sense resistors and the battery pack voltage.
Due to its compatible protocol, the LTC2949 can share the same communication bus with ADI battery stack monitors that contain the isoSPI™ interface.
The LTC2949 is typically powered from an isolated supply and directly connected to the battery stack on the low or high side depending on the shunt position. Resistive high voltage dividers provide connections to high voltage terminals that need to be supervised.
All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including Patents 8908779, 9182428, 92701.
Documentation & Resources
R567 Reliability Data3/23/2018
DC2732A - Demo Manual2/12/2020
Electric Vehicle Wireless Battery Management Revolution Has Begun and the ROI Potential Is Huge11/5/2021 Thought Leadership
Low Voltage Battery Monitor Floats into High Voltage Electric Vehicles10/2/2020 Analog Dialogue
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LTC2949HLXE#3ZZPBF||Material Declaration||Reliability Data||48-Lead LQFP (7mm x 7mm w/ EP)|
|LTC2949HLXE#3ZZTRPBF||Material Declaration||Reliability Data||48-Lead LQFP (7mm x 7mm w/ EP)|
|LTC2949ILXE#3ZZPBF||Material Declaration||Reliability Data||48-Lead LQFP (7mm x 7mm w/ EP)|
|LTC2949ILXE#3ZZTRPBF||Material Declaration||Reliability Data||48-Lead LQFP (7mm x 7mm w/ EP)|
|Wafer Fabrication Data||R567 Reliability Data|
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