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MCP3905A/05L/06A

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 (typical)

• Direct drive for electromagnetic mechanical

counter and two-phase stepper motors

•Low I

of 4 mA (typical)

• Tamper output pin for negative power indication

• Industrial Temperature Range: -40°C to +85°C

• Extended Temperature Range: -40°C to +125°C

• Supplies instantaneous real power on HF

OUT

for

meter calibration

Description

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 I

and

MAX

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 no-load 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.

Package Type

Functional Block Diagram

OUT0

GND

NEG

OUT1

OSC2

OSC1

HPF

CH0+

CH0-

CH1-

CH1+

OUT

169

MCLR

REFIN/OUT

GND

24-Pin SSOP

16-bit

ΔΣ ADC

MCLR

–

CH0+

CH0-

Reference

2.4V

–

CH1+

CH1-

HPF1

LPF1

E-to-F

conversion

REFIN/

OUT1

OUT

G0 G1

F2 F1

OUT0

OSC1 OSC2

OUT

NEG

HPF

Multi-level

16-bit

ΔΣ ADC

Multi-level

HPF1

PGA

POR

Energy Metering ICs with Active Real Power Pulse Output

Summary of content (32 pages)

PAGE 1
MCP3905A/05L/06A Energy Metering ICs with Active Real Power Pulse Output Features Description • 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, DeltaSigma Analog-to-Digital Converters (ADCs) • Reduced pulse-width of calibration output frequency and mechanical counter drive for low power meter designs (MCP3905L) • In
PAGE 3
MCP3905A/05L/06A 1.0 ELECTRICAL CHARACTERISTICS † 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 affect device reliability. Absolute Maximum Ratings † VDD..................................................
PAGE 4
MCP3905A/05L/06A ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise indicated, all parameters apply at AVDD = DVDD = 4.5V – 5.5V, Internal VREF, HPF turned on (AC mode), AGND, DGND = 0V, MCLK = 3.58 MHz; TA = -40°C to +85°C. Parameter Sym Min Typ Max Units Comment Reference Input Input Range 2.2 — 2.6 V Input Impedance 3.
PAGE 5
MCP3905A/05L/06A TIMING CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, all parameters apply at AVDD = DVDD = 4.5V – 5.5V, AGND, DGND = 0V, MCLK = 3.58 MHz; TA = -40°C to +85°C.
PAGE 6
MCP3905A/05L/06A tFP tFW FOUT0 tFS tFS2 FOUT1 tHW HFOUT tHP NEG FIGURE 1-1: DS22011B-page 6 Output Timings for Pulse Outputs and Negative Power Pin. © 2006-2011 Microchip Technology Inc.
PAGE 7
MCP3905A/05L/06A 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.
PAGE 8
MCP3905A/05L/06A 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 0.0001 Measurement Error Measurement Error Note: Unless otherwise specified, DVDD, AVDD = 5V; AGND, DGND = 0V; VREF = Internal, HPF = 1 (AC mode), MCLK = 3.58 MHz. +85°C +25°C - 40°C 0.0010 0.0100 0.1000 1.0000 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 0.0001 Measurement Error, +85°C +25°C - 40°C 0.0010 0.0100 0.1000 CH0 Vp-p Amplitude (V) FIGURE 2-8: Gain = 2, PF = 1. DS22011B-page 8 Measurement Error, -40°C 0.
PAGE 9
MCP3905A/05L/06A 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0.0001 +25°C; PF = 1 Measurement Error (%) Measurement Error (%) Note: Unless otherwise specified, DVDD, AVDD = 5V; AGND, DGND = 0V; VREF = Internal, HPF = 1 (AC mode), MCLK = 3.58 MHz. +25°C; PF = 0.5 +125°C; PF = 0.5 +125°C; PF = 1 0.001 0.01 0.1 CH1 Vp-p Amplitude (V) 1 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0.0001 +25°C; PF = 1 +25°C; PF = 0.5 +125°C; PF = 0.5 +125°C; PF = 1 0.001 0.01 0.
PAGE 10
MCP3905A/05L/06A 2500 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 2000 PF = 0.5 Occurance 16384 Samples Mean = - 234.7 µV Std. dev = - 6.91 µV 1500 1000 500 PF = 1 Measurement Error vs. 2000 1500 1000 500 VDD=4.5V 0.05 0 -0.05 0.0010 FIGURE 2-19: (G = 16). 16384 Samples Mean = -470.2 µV Std. Dev = 13.8 µV 2500 2000 1500 1000 500 Channel 0 Offset (V) FIGURE 2-17: Channel 0 Offset Error (DC Mode, HPF off), G = 8. -434.6E-6 -440.1E-6 -445.6E-6 -450.6E-6 -456.1E-6 -461.6E-6 -467.
PAGE 11
MCP3905A/05L/06A 0.3 0.3 0.2 0.2 0.1 +85°C 0 +25°C - 40°C -0.1 -0.2 -0.3 0.0001 0.0010 0.0100 0.1000 1.0000 CH0 Vp-p Amplitude (V) Measurement Error Measurement Error Note: Unless otherwise specified, DVDD, AVDD = 5V; AGND, DGND = 0V; VREF = Internal, HPF = 1 (AC mode), MCLK = 3.58 MHz. +85°C +25°C 0.1 0 - 40°C -0.1 -0.2 -0.3 0.0000 0.0001 0.0010 0.0100 0.1000 CH1 Vp-p Amplitude (V) FIGURE 2-21: Measurement Error w/ External VREF, (G = 1).
PAGE 13
MCP3905A/05L/06A 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: 3.1 PIN FUNCTION TABLE Pin No.
PAGE 14
MCP3905A/05L/06A 3.5 Voltage Channel (CH1-,CH1+) CH1- and CH1+ are the fully differential analog voltage input channels for voltage measurement. The linear and specified region of these channels have a maximum differential voltage of ±660 mV and a maximum absolute voltage of ±1V, with respect to AGND. Up to ±6V can be applied to these pins without the risk of permanent damage. Refer to Section 1.0 “Electrical Characteristics”. 3.
PAGE 15
MCP3905A/05L/06A 4.0 DEVICE OVERVIEW The instantaneous power signal contains the realpower information; it is the DC component of the instantaneous power. The averaging technique can be used with both sinusoidal and non-sinusoidal waveforms, as well as for all power factors. The instantaneous power is thus low-pass filtered in order to produce the instantaneous real-power signal.
PAGE 16
MCP3905A/05L/06A Analog Inputs 4.2 The MCP3905A/05L/06A analog inputs can be connected directly to the current and voltage transducers (such as shunts or current transformers). Each input pin is protected by specialized ESD structures that are certified to pass 5 kV HBM and 500V MM contact charge. These structures also allow up to ±6V continuous voltage to be present at their inputs without the risk of permanent damage. Both channels have fully differential voltage inputs for better noise performance.
PAGE 17
MCP3905A/05L/06A Ultra-Low Drift VREF The MCP3905A/05L/06A devices contain an internal voltage reference source specially designed to minimize drift over temperature. This internal VREF supplies reference voltage to both current and voltage channel ADCs. The typical value of this voltage reference is 2.4V ±100 mV.
PAGE 18
MCP3905A/05L/06A The multiplier output gives the product of the two highpass filtered channels, corresponding to instantaneous real power. Multiplying two sine wave signals by the same ω frequency gives a DC component and a 2ω component. The instantaneous power signal contains the real power of its DC component, while also containing 2ω components coming from the line frequency multiplication.
PAGE 19
MCP3905A/05L/06A The high-frequency output HFOUT has lower integration times and, thus, higher frequencies. The output frequency value can be calculated with the following equation: EQUATION 4-2: HFOUT FREQUENCY OUTPUT EQUATION 8.
PAGE 21
MCP3905A/05L/06A 5.0 APPLICATIONS INFORMATION 5.1 Meter Design using the MCP3905A/05L/06A For all applications information, refer to AN994, "IEC Compliant Active Energy Meter Design Using The MCP3905/6” (DS00994).
PAGE 23
MCP3905A/05L/06A 6.0 PACKAGING INFORMATION 6.1 Package Marking Information 24-Lead SSOP Examples: XXXXXXXXXXX XXXXXXXXXXX YYWWNNN MCP3905A e3 E/SS^^ 1120256 MCP3905L e3 E/SS^^ 1120256 MCP3906A e3 E/SS^^ 1120256 Legend: XX...
PAGE 24
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PAGE 25
MCP3905A/05L/06A Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging © 2006-2011 Microchip Technology Inc.
PAGE 27
MCP3905A/05L/06A APPENDIX A: REVISION HISTORY Revision B (July 2011) The following is the list of modifications: 1. 2. 3. 4. Added Extended Temperature item to the Features list. Updated Section 2.0, Typical Performance Curves with new extended temperature graphics (Figures 2-11 to 2-14). Updated Section 6.0, Packaging Information to show the Land Pattern drawings. Updated the Product Identification System section with the Extended Temperature characteristic and examples.
PAGE 29
MCP3905A/05L/06A PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO.
PAGE 31
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 32
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