Microchip | MCP3905L-I/SS

The MCP3905L series of energy-metering ICs designed to support the IEC 62053 international metering standard specification. They supply a frequency output proportional to the average active real power, as well as a higher-frequency output proportional to the instantaneous power for meter calibration.

The MCP3905L offers reduced pulse width of calibration output frequency and mechanical counter drive for lower power meter designs. They include two 16-bit, Delta-Sigma ADCs for a wide range of IB and IMAX currents and/or small shunt (<200 μOhms) meter designs. It includes an ultra-low drift voltage reference with < 15 ppm/°C through a specially designed band gap temperature curve for the minimum gradient across the industrial temperature range. A fixed-function DSP block is on-chip for active real-power calculation. A noload threshold block prevents any current creep measurements. A Power-On Reset (POR) block restricts meter performance during low-voltage situations. These accurate energy metering ICs with high field reliability are available in the industry standard pinout.

Features:

• Supplies active (real) power measurement for single-phase, residential energy metering
• Supports IEC 62053 International Energy Metering Specification and legacy IEC 1036/61036/687 Specifications
• Two multi-bit, DAC, second-order, 16-bit, Delta- Sigma Analog-to-Digital Converters (ADCs)
• Reduced pulse width of calibration output frequency and mechanical counter drive for low power meter designs (MCP3905L)
• Increased output frequency constant options for meter design (MCP3905L)
• 0.1% typical measurement error over 500:1 dynamic range (MCP3905A / MCP3905L)
• 0.1% typical measurement error over 1000:1 dynamic range (MCP3906A)
• Programmable Gain Amplifier (PGA) for small signal inputs supports low value shunt current sensor:
• 16:1 PGA - MCP3905A / MCP3905L
• 32:1 PGA - MCP3906A
• Ultra-low drift on-chip reference: 15 ppm/°C (typ.)
• Direct drive for electromagnetic mechanical counter and two-phase stepper motors
• Low IDD of 4 mA (typ.)
• Tamper output pin for negative power indication
• Industrial Temperature Range: -40°C to +85°C
• Supplies instantaneous real power on HFOUT for meter calibration