Microchip MCP3905 Handleiding

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© 2009 Microchip Technology Inc.DS21948E-page 1

MCP3905/06

Features

•Supplies active (real) power measurement for

single-phase, residential energy-metering

•Supports the IEC 62053 International Energy

Metering Specification and legacy IEC 1036/

61036/687 Specifications

•Two multi-bit, Digital-to-Analog Converters

(DACs), second-order, 16-bit, Delta-Sigma

Analog-to-Digital Converters (ADCs)

•0.1% typical measurement error over 500:1

dynamic range (MCP3905)

•0.1% typical measurement error over 1000:1

dynamic range (MCP3906)

•Programmable Gain Amplifier (PGA) for small-

signal inputs supports low-value shunt current

sensor

-16:1 PGA - MCP3905

-32:1 PGA - MCP3906

•Ultra-low drift on-chip reference: 15ppm/°C

(typical)

•Direct drive for electromagnetic mechanical

counter and two-phase stepper motors

•Low IDD of 4 mA (typical)

•Tamper output pin for negative power indication

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

•Supplies instantaneous active (real) power on

HFOUT for meter calibration

US Patents Pending

Description

The MCP3905/06 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. They include two 16-bit, delta-sigma ADCs

for a wide range of IBand 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. Strong

output drive for mechanical counters are on-chip to

reduce field failures and mechanical counter sticking. 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

FOUT0

DGND

NEG

1

2

3

4

24

23

22

21

20

19

18

17

5

6

7

8

FOUT1

NC

OSC2

OSC1

DVDD

HPF

AVDD

NC

CH0+

CH0-

CH1-

CH1+

HFOUT

16

9G0

MCLR

15

14

10

11

G1

F0

REFIN/OUT

AGND

1312 F1

F2

24-Pin SSOP

16-bit

ΔΣ ADC

MCLR

+

–

CH0+

CH0-

Reference

2.4V

+

–

CH1+

CH1-

HPF1

LPF1 E-to-F

conversion

REFIN/

FOUT1

HFOUT

G0 G1

F2 F1

FOUT0

OSC1 OSC2

OUT

NEG

HPF

F0

Multi-level

16-bit

ΔΣ ADC

Multi-level

X

HPF1

PGA

POR

Energy-Metering ICs with Active (Real) Power Pulse Output

Obsolete Device

Replacement Device:

MCP3905A/MCP3906A

Product specificaties