MCP3905/06
Energy-Metering ICs with Active (Real) Power Pulse Output
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: 15 ppm/°C (typ.)
• Direct drive for electromagnetic mechanical
counter and two-phase stepper motors
• Low I
DD
of 4 mA (typ.)
• Tamper output pin for negative power indication
• Industrial Temperature Range: -40°C to +85°C
• Supplies instantaneous active (real) power on
HF
OUT
for meter calibration
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 I
B
and I
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. 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.
Package Type
24-Pin SSOP
DV
DD
HPF
AV
DD
NC
CH0+
CH0-
CH1-
CH1+
MCLR
REFIN/OUT
A
GND
F2
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
F
OUT0
F
OUT1
HF
OUT
D
GND
NEG
NC
OSC2
OSC1
G0
G1
F0
F1
US Patents Pending
Functional Block Diagram
G0 G1
HPF
OSC1 OSC2
HF
OUT
CH0+
CH0-
+
PGA
–
16-bit
Multi-level
ΔΣ
ADC
HPF1
F2
F1
F0
F
OUT0
F
OUT1
NEG
REFIN/
OUT
2.4V
Reference
X
16-bit
Multi-level
ΔΣ
ADC
HPF1
LPF1
E-to-F
conversion
CH1+
CH1-
+
–
POR
MCLR
©
2007 Microchip Technology Inc.
DS21948D-page 1
MICROCHIP [ MICROCHIP TECHNOLOGY ]
