ADM1294:  Digital Power Monitor with PMBus Interface

Product Details

Product Status:Pre-Release

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 I2C interface.

These devices acquire the current by measuring the voltage difference across the external sense resistor. This voltage is amplified and then 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 is able to perform multiplication of the current and primary input voltage for power calculation. ADM129x power monitors also feature power accumulator for energy metering function. An industrystandard PMBus interface allows a master controller to read back these data from the device. The master controller can then combine this information with known sense resistor value to work out the current, voltage, power and energy consumption over time on the monitored rail.

In conditions such as over current, over/under voltage and over power, ADM129x devices can generate an interrupt signal to the microprocessor through its ALERT/GPO output. The threshold for these conditions can be digitally programmed via PMBUS.

The ADM1293 is designed for high side supply monitoring with voltage monitoring range from 0V to 20V. The ADM1294 is design for low side supply monitoring. Its integrated shunt regulator allows it to be powered and monitor supply in wide voltage ranges.

The ADM129x devices are available in 4x4mm 16-lead LFCSP and 14-lead TSSOP packages with specified operating temperature range from −40°C to +85°C.


  • Power monitoring/power budgeting
  • Central office equipment
  • Telecommunications and data communications equipment
  • PCs/servers


  • High accuracy current monitoring at low sense voltage
  • ±0.5% accurate, 12-bit ADC for current and two voltages
  • Support high side and low side current sensing
  • Integrated shunt regulator for wide supply input
  • Reports current, voltage and power
  • Power accumulation for energy metering
  • Bi-directional current sensing
  • Digital programmable over current alert
  • See datasheet for additional features

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