The ADM1293 and ADM1294 are high accuracy integrated digital power monitors that offer digital current， voltage， and power monitoring using an on-chip， 12-bit analog-to-digital converter （ADC）， communicated through a PMBus? compliant I2 C interface. These devices acquire the current by measuring the voltage difference across the external sense resistor. This voltage is amplified and digitized by an internal 12-bit ADC. The same ADC can also sample the primary input voltage and an auxiliary input voltage. The internal digital block can perform multiplication of the current and primary input voltage for power calculation. The ADM1293/ADM1294 also feature a power accumulator for energy metering. An industry-standard PMBus interface allows a master controller to read back these data from the device. The master controller can then combine this information with a known sense resistor value to calculate the current， voltage， power， and energy consumption over time on the monitored rail.