LTC2945HUD-1#PBF Datasheet PDF - Linear Technology

●The LTC2945HUD-1#PBF is a wide range I2C power monitor in 12 pin QFN package. This rail to rail system monitor measures current, voltage and power. It includes shunt regulator for supplies above 80V to allow flexibility in the selection of input supply. An onboard 0.75% accurate 12bit ADC measures load current, input voltage and an auxiliary external voltage. A 24bit power value is generated by digitally multiplying the measured 12bit load current and input voltage data. An overrange alert with programmable thresholds minimizes the need for software polling. An internal linear regulator allows the LTC2945-1 to operate directly from 4V to 80V rail or from an external supply voltage between 2.7V and 5.9V. Data is reported via a standard I2C interface and shutdown mode reduces power consumption to 20µA. The LTC2945-1 has an inverted data output for use with inverting opto isolator configurations.

● Rail to rail input range from 0V to 80V

● 12bit resolution for current and voltages

● Stores minimum and maximum values

● Alerts when limits exceeded

● Additional ADC input monitors an external voltage

● Continuous scan and snapshot modes

● Shutdown mode with quiescent current of less than 80µA

● Internal multiplier calculates 24bit power value

● Conversion time in snapshot mode is 33ms (VIN, ADIN)

● Operating temperature range from -40°C to 125°C