Datasheet Linear Technology LTC2946CMS#TRPBF
Wide Range I2C Power, Charge and Energy Monitor
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LTC2946 Wide Range I2C Power, Charge and Energy Monitor FEATURES DESCRIPTION
The LTC®2946 is a rail-to-rail system monitor that measures current, voltage, power, charge and energy. It features an operating range of 2.7V to 100V and includes a shunt regulator for supplies above 100V. The current measurement common mode range of 0V to 100V is independent of the input supply. A 12-bit ADC measures load current, input voltage and an auxiliary external voltage. Load current and internally calculated power are integrated over an external clock or crystal or internal oscillator time base for charge and energy. An accurate time base allows the LTC2946 to provide measurement accuracy of better than ±0.6% for charge and ±1% for power and energy. Minimum and maximum values are stored and an overrange alert with programmable thresholds minimizes the need for software polling. Data is reported via a standard I2C interface. The LTC2946 I2C interface includes separate data input and output pins for use with standard or opto-isolated I2C connections. The LTC2946-1 has an inverted data output for use with inverting opto-isolator configurations.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Rail-to-Rail Input Range: 0V to 100V Wide Input Supply Range: 2.7V to 100V Shunt Regulator for Supplies >100V ADC with Less Than ±0.4% Total Unadjusted Error 12-Bit Resolution for Current and Voltages ±1% Accurate Power and Energy Measurements ±0.6% Accurate Current and Charge Measurements Additional ADC Input Monitors an External Voltage Internal ±5% or External Time Bases Continuous Scan and Snapshot Modes Stores Minimum and Maximum Values Alerts When Limits Exceeded Split SDA Pin Eases Opto-Isolation Shutdown Mode with IQ < 40µA Available in 4mm × 3mm DFN and 16-Lead MSOP Packages APPLICATIONS n Telecom Infrastructure Industrial Equipment General Purpose Energy Measurement TYPICAL APPLICATION
Wide Range Power, Charge and Energy Monitor with Onboard ADC and I2C
VIN 4V TO 100V 0.02 SENSE+ VDD 0.1µF NINE I2C ADDRESSES ACCUMULATION ENABLE INTVCC ADR1 ADR0 GND GPIO2 CLKIN LTC2946 SENSE GPIO3 SCL SDAI SDAO ADIN GPIO1 CLKOUT TO LOAD ALERT ADC TUE (LSB) I2C INTERFACE MEASURED VOLTAGE GENERAL PURPOSE OUTPUT 1 0 1 2 3
2946 TA01a ADC Total Unadjusted Error (ADIN)
3 2 OPTIONAL CRYSTAL TIMEBASE 0 1024 2048 CODE 3072 4096
2946 TA01b 2946f For more information www.linear.com/LTC2946 1 LTC2946 ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2) V ...
Other Names: LTC2946CMSTRPBF, LTC2946CMS TRPBF
Docket:LTC2946 Wide Range I2C Power, Charge and Energy Monitor FEATURES DESCRIPTION
The LTC®2946 is a rail-to-rail system monitor that measures current, voltage, power, charge and energy. It features an operating range of 2.7V to 100V and includes a shunt regulator for supplies above 100V. The current measurement common mode range o...