Analog Devices Inc. LTC2949 Current & Stack Voltage Monitor IC
Analog Devices Inc. LTC2949 Current and Stack Voltage Monitor IC is designed to measure current, voltage, temperature, charge, and energy for electrical and hybrid vehicles and other isolated current sense applications. The LTC2949 infers charge and energy flowing in and out of a battery pack by simultaneously monitoring the voltage drop over up to two sense resistors and the battery pack voltage. Low offset ΔΣ Analog to Digital Converters (ADCs) ensure accurate voltage and current measurement 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 LTC2949 includes a built-in serial interface, which can be configured to support isolated isoSPI™ communication to the host or as an SPI interface. This device also supports synchronous measurements with other cell monitors, such as the LTC681x Multi-Cell Battery Monitor ICs.
The LTC2949 features 12 internally buffered high impedance inputs (V1 to V12) for measuring voltages from external sensors or resistor dividers, allowing measurement of temperatures, HV-Link voltages, chassis isolation, and supervised contactor states. This device has up to five programmable digital outputs set to ground, supply, or toggle at 400kHz. Programmable threshold and tracking registers reduce digital traffic to the host.
The Analog Devices LTC2949 Current and Voltage Monitor IC is available in a 48-lead Low Profile Quad Flat Pack (LQFP) package and is AEC-Q100 qualified for automotive applications.
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Features
- AEC-Q100 qualified for automotive applications
- 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
- Supports synchronous measurements with cell monitors
- Up to 12 buffered voltage measurement inputs
- Up to 5 GPOs, configurable to drive ground, supply, or toggling at 400kHz
- High side 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
- Operating temperature range
- LTC2949I: -40°C to +85°C
- LTC2949H: -40°C to +125°C
- Package type: LQFP-48
Applications
- Electric and hybrid vehicles
- Isolated current sensing
- Backup battery systems
- High-power portable equipment
Block Diagram
Typical Application Circuit
Videos
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Analog Devices Inc. LTC6811 12-Channel Battery Monitor IC
Measures up to 12 series-connected battery cells with a total measurement error of less than 1.2mV.
Analog Devices Inc. LTC6810 6-Channel Multi-Cell Battery Monitor
Measures up to six series-connected battery cells with a total measurement error of less than 1.8mV.
Associated Demo Circuit
Analog Devices Inc. DC2732A Demo Boards for the LTC2949
Designed to demonstrate a high voltage battery pack monitor based on the LTC2949.