MCP3905A

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




Pinout






Specifications

Parameter Name	Value
Measurement Error	0.1%
Dynamic Range	500:1
Voltage Reference Drift ppm typ	15
Mech Counter Drive (mA)	15
PSRR % typ	0.01%
Temp. Range (°C)	-45 to 85
Supply Voltage Range (V)	4.5 to 5.5

Parameter NameValueMeasurement Error0.1%Dynamic Range500:1Voltage Reference Drift ppm typ15Mech Counter Drive (mA)15PSRR % typ0.01%Temp. Range (°C)-45 to 85Supply Voltage Range (V)4.5 to 5.5

VDD ...................................................................................7.0V
Digital inputs and outputs w.r.t. AGND....... -0.6V to VDD +0.6V
Analog input w.r.t. AGND..................................... ....-6V to +6V
VREF input w.r.t. AGND............................... -0.6V to VDD +0.6V
Storage temperature ..................................-65°C to +150°C
Ambient temp. with power applied .............-65°C to +125°C
Soldering temperature of leads (10 seconds) ............+300°C
ESD on the analog inputs (HBM,MM) ....................5.0 kV, 500V
ESD on all other pins (HBM,MM) ...........................5.0 kV, 500V
† Notice: Stresses above those listed under "Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affectdevice reliability.

Description

The MCP3905A 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 MCP3905A 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 of MCP3905A 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 MCP3905A/05L/06A devices are 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. MCP3905A 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 of MCP3905A restricts meter performance during low-voltage situations. These accurate energy metering ICs with high field reliability are available in the industry standard pinout.