High-Side/Low-Side Current Sensor
• 100 mV Full-Scale Range to Sense Current (Configurable to 50 mV)
• 16-Bit Resolution Sense Current
• External Sense Resistor Sets the Full-Scale Current Range
• Very Low Input Current Simplies Routing

Voltage Monitor with Wide VBUS Range
• 0V to 32V Full Scale Range (Configurable to 16V)
• 16-Bit Resolution for Voltage Measurements

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 Ennergy Measurement
• User Programmable Sampling Rate: 8, 64, 256, 1024 SPS
• 5120 SPS for 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)

ALERT on Over/Undervoltage and Current or Overpower Conditions
• Two Independent ALERT/GPIO Pins
• Coulomb Counting: When Selected, the Accumu lator Accumulates VSENSE Values

The PAC1951 is a 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.

There are two versions of the PAC1951: the PAC1951-1 devices are for high-side current sensing and the PAC1951-2 devices are for low-side current sensing.