High-Side Current Monitor with Four Channels
• 100 mV Full-Scale Range (configurable to 50mV)
• External Sense Resistor Sets the Full-Scale Current Range

Voltage Monitor with Wide VBUS Range
• 0V to 9V FSR (configurable to 4.5V)
• 16-bit Resolution

Real-Time Auto-Calibration of Offset Error for Voltage and Current

1% Power Measurement Accuracy over a Wide Dynamic Range

On-Chip Accumulation of 30-bit Power Results for Energy Measurement
• User Programmable Sampling Rates of 8, 64, 256 and 1024 SPS
• 5120 SPS for a Single Channel in Burst Mode

2.7V to 5.5V Supply Operation
• 1.62-5.5V Capable I2C/SMBus and Digital I/O
• SMBus 3.1 and I2C Fast Mode Plus, 1 Mbps
• High-Speed Mode (3.4 Mbps)
• Two Independent ALERT/GPIO pins

ALERT on Over/Undervoltage and Current or Overpower Conditions
• Coulomb Counting: When Selected, the Accumulator Accumulates VSENSE Values

The PAC1944 is a quad power monitor and energy monitor that reports on bus voltage and sense voltage 16-bits of resolution.  Power is reported as a simultaneous product of two 16-bit independent bus and sense voltages.  All registers are accessible through I2C / SMBus including an 8 sample average for reading stability.  The device can detect over/undervoltage, over/undercurrent and overpower against user programmed limits for each channel and generate ALERT outputs.