Digital power monitors with PMBus Interface measure voltage differences
Test & Measurement
Mouser is now stocking the Analog Devices ADM1293 and ADM1294 digital power
monitors with PMBus Interface. The high-accuracy, integrated digital power
monitors provide digital current, voltage, and power monitoring using an
on-chip, 12-bit analog-to-digital converter (ADC), communicated through a
PMBus-compliant I2C interface.
Both devices use an external sense resistor to determine current by
measuring voltage differences. The internal 12-bit ADC amplifies and
digitizes the voltage, and can also simultaneously sample primary and
auxiliary input voltage. The internal digital block performs multiplication
of the current and primary input voltage to calculate power, and the devices
feature a power accumulator to meter energy. An industry-standard PMBus
interface enables a master controller to read back the data from the device.
The master controller combines the information with a known sense resistor
value to calculate the current, voltage, power, and energy consumption over
time on the monitored rail.
The ADM1293 and ADM1294 are rated for -40C to 125C. The ADM1293 is designed
for high-side supply monitoring (0V to 20V), and the ADM1294 is designed for
low-side supply monitoring (-48V to 0V, with integrated shunt regulator).