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LTC2940 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2940 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC2945 1 2945f TYPICAL APPLICATION FEATURES DESCRIPTION Wide Range I2C Power Monitor Wide Range Power Monitor with Onboard ADC and I2C APPLICATIONS n Rail-to-Rail Input Range: 0V to 80V n Wide Input Supply Range: 2.7V to 80V n Shunt Regulator for Supplies >80V n Δ∑ ADC with less than ±0.75% Total Unadjusted Error n 12-Bit Resolution for Current and Voltages n Internal Multiplier Calculates 24-Bit Power Value n Stores Minimum and Maximum Values n Additional ADC Input Monitors an External Voltage n Internal Digital Multiplier Calculates Power n Continuous Scan and Snapshot Modes n Shutdown Mode with IQ < 80μA n Split SDA for Opto-Isolation n Available in 12-Lead 3mm × 3mm QFN and MSOP Packages n Telecom Infrastructure n Industrial n Automotive n Consumer L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. I2C INTERFACE NINE I2C ADDRESSES SENSE+ SENSE– ALERT SCL SDAI SDAO ADIN VDD INTVCC ADR1 ADR0 GND LTC2945 MEASURED VOLTAGE TO LOAD 0.1μF 0.02Ω VIN 4V TO 80V 2945 TA01 ADC Differential Nonlinearity (ADIN) ADC Integral Nonlinearity (ADIN) The LTC®2945 is a rail-to-rail system monitor that mea- sures current, voltage, and power. It features an operating range of 2.7V to 80V and includes a shunt regulator for supplies above 80V to allow flexibility in the selection of input supply. The current measurement range of 0V to 80V is independent of the input supply. An onboard 0.75% accurate 12-bit ADC measures load current, input voltage and an auxiliary external voltage. A 24-bit power value is generated by digitally multiplying the measured 12-bit load current and input voltage data. Minimum and maximum values are stored and an overrange alert with program- mable thresholds minimizes the need for software polling. Data is reported via a standard I2C interface. Shutdown mode reduces power consumption to 20μA. The LTC2945 I2C interface includes separate data input and output pins for use with standard or opto-isolated I2C connections. The LTC2945-1 has an inverted data output for use with inverting opto-isolator configurations. CODE 0 –0.3 0.3 0.0 0.1 0.2 –0.2 –0.1 3072 4096 1024 2048 2945 TA01a CODE 0 –0.3 0.3 0.0 0.1 0.2 –0.2 –0.1 3072 4096 1024 2048 2945 TA01b |
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