MCP3905/06
Energy-Metering ICs with Active (Real) Power Pulse Output
Features
Description
The MCP3905/06 devices are energy-metering ICs
designed to support the IEC 62053 International
• Supplies active (real) power measurement for
single-phase, residential energy-metering
Metering Standard Specification. They supply
a
• Supports the IEC 62053 International Energy
Metering Specification and legacy IEC
1036/61036/687 Specifications
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 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. 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 mea-
surements. 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.
• 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: 15 ppm/°C (typ.)
• Direct drive for electromagnetic mechanical
counter and two-phase stepper motors
Package Type
• Low IDD of 4 mA (typ.)
DVDD
HPF
AVDD
NC
1
24 FOUT0
• Tamper output pin for negative power indication
• Industrial Temperature Range: -40°C to +85°C
24-Pin SSOP
FOUT1
HFOUT
2
3
4
5
23
22
• Supplies instantaneous active (real) power on
HFOUT for meter calibration
21 DGND
20 NEG
CH0+
CH0-
CH1-
CH1+
MCLR
NC
6
7
8
19
18
OSC2
17 OSC1
16 G0
US Patents Pending
9
REFIN/OUT 10
15
G1
AGND
F2
11
12
14 F0
13 F1
Functional Block Diagram
G0 G1
HPF
OSC1 OSC2
HFOUT
FOUT0
FOUT1
CH0+
CH0-
+
16-bit
Multi-level
ΔΣ ADC
PGA
–
F2 F1 F0
NEG
HPF1
REFIN/
OUT
E-to-F
conversion
LPF1
X
2.4V
Reference
CH1+
CH1-
+
–
16-bit
Multi-level
ΔΣ ADC
POR
HPF1
MCLR
© 2007 Microchip Technology Inc.
DS21948D-page 1
MICROCHIP [ MICROCHIP ]
