LTC2945HUD#PBF

LTC®2945 is a rail-to-rail system monitor that measures current, voltage, and power. The current measurement range of 0V to 80V is independent of the input supply. An on-board 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 programmable thresholds minimizes the need for software polling. Data is reported via a standard I2C interface. Shutdown mode reduces power consumption to 20µA. Typical applications are telecom infrastructure, industrial, automotive, consumer.

• Includes separate data input and output pins for use with standard or opto-isolated I²C connections
• VDD supply voltage range from 4 to 80V at TA = 25°C
• VDD supply current is 0.8mA at VDD = 48V, INTVCC open shutdown, TA = 25°C
• INTVCC supply voltage range is 2.7 to 5.9V
• Shunt regulator for supplies <gt/>80V
• Δ∑ ADC with less than ±0.75% total unadjusted error
• 12-bit resolution for current and voltages, internal multiplier calculates 24-bit power value
• Stores minimum and maximum values, alerts when limits exceeded
• Continuous scan and snapshot modes, split SDA for opto-isolation
• 12-lead (3mm × 3mm) plastic QFN package, –40°C to 125°C temperature range

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