LTC2991: Octal I2C Voltage, Current, and Temperature Monitor Data Sheet10/23/2015756K
Features and Benefits
- Measures Voltage, Current, Temperature
- Measures Four Remote Diode Temperatures
- 0.7°C (Typ) Accuracy, 0.06°C Resolution
- 1°C (Typ) Internal Temperature Sensor
- Series Resistance Cancellation
- 14-Bit ADC Measures Voltage/Current
- PWM Temperature Output
- 3V to 5.5V Supply Operating Voltage
- Eight Selectable Addresses
- Internal 10ppm/°C Voltage Reference
- V1 to V8 Inputs ESD Rated to 6kV HBM
- 16-Lead MSOP Package
The LTC2991 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the eight monitors can individually measure supply voltages and can be paired for differential measurements of current sense resistors or temperature sensing transistors. Additional measurements include internal temperature and internal VCC. The internal 10ppm reference minimizes the number of supporting components and area required. Selectable address and configurable functionality give the LTC2991 flexibility to be incorporated in various systems needing temperature, voltage or current data. The LTC2991 fits well in systems needing submillivolt voltage resolution, 1% current measurement and 1°C temperature accuracy or any combination of the three.
- Temperature Measurement
- Supply Voltage Monitoring
- Current Measurement
- Remote Data Acquisition
- Environmental Monitoring
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
Demonstration Circuit 2561A features the LTC2992, a rail-to-rail system monitor that measures current, voltage, and power of two supplies. It features an operating range of 2.7V to 100V and includes a shunt regulator for supplies above 100V. The voltage measurement range of 0V to 100V is independent of the input supply. Two ADCs simultaneously measure each supply's current. A third ADC monitors the input voltages and four auxiliary external voltages. Each supply's current and power is added for total system consumption. Minimum and maximum values are stored and an over range alert with programmable thresholds minimizes the need for software polling. Data is reported via a standard l2C interface. Shutdown mode reduces power consumption to 25μA typically.
Demonstration circuit 1785B features the LTC2991, a high performance temperature, voltage and current monitor that uses an I2C interface for communication. It offers sub-millivolt voltage resolution, 1% current measurement and 1°C temperature accuracy.
Documentation & Resources
R544 Reliability Data3/26/2018151 K
DC1785B - Demo Manual10/13/2014339K
Power System Manager and Super Sequencer Selection Guide2/23/20184M
Power and Thermal Monitoring1/9/20171M
Tools & Simulations
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Linduino code repository on GitHub and instructions on how to use the code.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.