The MCP3905L is an energy measurement IC supporting the IEC 62053 international energy metering specification. The output of the device includes a frequency proportional to the average active (real) power at the inputs as well as a higher frequency output proportional to the instantaneous power for meter calibration. The MCP3905L incorporates two 16-bit delta-sigma ADCs with a progammable gain up to 16, which enable small shunt meter designs for measuring a wide range of Ib and Imax currents. The integrated on-chip voltage reference has ultra-low temperature drift of 15 ppm per degree C. Also on-chip is a fixed-function DSP for active (real) power calculation. The MCP3905L offers reduced pulse width of calibration output frequency and mechanical counter drive for low power meter designs.

• Supplies active (real) power measurement for single-phase, residential energy metering
• Supports IEC 62053 International EnergyMetering Specification and legacy IEC1036/61036/687 Specifications
• 16-bit, Delta-Sigma Analog-to-Digital Converters (ADCs)
• Reduced pulse-width of calibration outputfrequency and mechanical counter drive for lowpower meter designs (MCP3905L)
• Increased output frequency constant options formeter design (MCP3905L)
• 0.1% typical measurement error over 500:1dynamic range (MCP3905A / MCP3905L)
• Programmable Gain Amplifier (PGA) for smallsignal inputs supports low value shunt currentsensor
• Ultra-low drift on-chip reference: 15 ppm/°C (typical)
• Direct drive for electromagnetic mechanicalcounter and two-phase stepper motors