MCP3905A/05L/06A
Energy Metering ICs with Active Real Power Pulse Output
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
DD
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
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. 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
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
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
LPF1
E-to-F
conversion
CH1+
CH1-
+
–
16-bit
Multi-level
ΔΣ
ADC
HPF1
POR
MCLR
©
2006-2011 Microchip Technology Inc.
DS22011B-page 1
MCP3905A/05L/06A
NOTES:
DS22011B-page 2
©
2006-2011 Microchip Technology Inc.
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 †
V
DD
...................................................................................7.0V
Digital inputs and outputs w.r.t. A
GND
........ -0.6V to V
DD
+0.6V
Analog input w.r.t. A
GND
..................................... ....-6V to +6V
V
REF
input w.r.t. A
GND
............................... -0.6V to V
DD
+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
ELECTRICAL CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, all parameters apply at AV
DD
= DV
DD
= 4.5V – 5.5V,
Internal V
REF
, HPF turned on (AC mode), A
GND
, D
GND
= 0V, MCLK = 3.58 MHz; T
A
= -40°C to +85°C.
Parameter
Overall Measurement Accuracy
Energy Measurement Error
E
—
0.1
—
% F
OUT
Channel 0 swings 1:500 range,
MCP3905A, MCP3905L only
(Note
1, Note 4)
% F
OUT
Channel 0 swings 1:1000 range,
MCP3906A only
(Note
1, Note 4)
% F
OUT
Disabled when F2, F1, F0 = 0, 1, 1
Max
(Note
5, Note 6)
s
HPF = 0 and 1, < 1 MCLK
(Note
4, Note 6, Note 7)
Sym
Min
Typ
Max
Units
Comment
—
No-Load Threshold/
Minimum Load
Phase Delay Between
Channels
AC Power Supply Rejection
(output frequency variation)
DC Power Supply Rejection
AC PSRR
DC PSRR
NLT
—
—
—
—
0.1
0.0015
—
0.01
0.01
—
—
1/MCLK
—
—
% F
OUT
F2, F1, F0 = 0, 1, 1
(Note
3)
% F
OUT
HPF = 1, Gain = 1
(Note
3)
(output frequency
variation)
System Gain Error
ADC/PGA Specifications
Offset Error
Gain Error Match
Internal Voltage Reference
Voltage
Tolerance
Tempco
Note 1:
—
—
—
2.4
±2
15
—
—
—
V
%
ppm/°C
V
OS
—
—
2
0.5
5
—
mV
Referred to Input
% F
OUT
(Note
5)
—
3
10
% F
OUT
(Note
2, Note 5)
2:
3:
4:
5:
6:
7:
Measurement error = (Energy Measured By Device - True Energy)/True Energy * 100%. Accuracy is
measured with signal (±660 mV) on Channel 1. F
OUT0
, F
OUT1
pulse outputs. Valid from 45 Hz to 65 Hz.
See typical performance curves for higher frequencies and increased dynamic range.
Does not include internal V
REF
. Gain = 1, CH0 = 470 mVDC, CH1 = 660 mVDC, difference between
measured output frequency and expected transfer function.
Percent of HF
OUT
output frequency variation; Includes external V
REF
= 2.5V, CH1 = 100 mVRMS @
50 Hz, CH2 = 100 mVRMS @ 50 Hz, AV
DD
= 5V + 1V
pp
@ 100 Hz. DC PSRR: 5V ±500 mV
Error applies down to 60 degree lead (PF = 0.5 capacitive) and 60 degree lag (PF = 0.5 inductive).
Refer to
Section 4.0 “Device Overview”
for complete description.
Specified by characterization, not production tested.
1 MCLK period at 3.58 MHz is equivalent to less than <0.005 degrees at 50 or 60 Hz.
©
2006-2011 Microchip Technology Inc.
DS22011B-page 3
MCP3905A/05L/06A
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Specifications:
Unless otherwise indicated, all parameters apply at AV
DD
= DV
DD
= 4.5V – 5.5V,
Internal V
REF
, HPF turned on (AC mode), A
GND
, D
GND
= 0V, MCLK = 3.58 MHz; T
A
= -40°C to +85°C.
Parameter
Reference Input
Input Range
Input Impedance
Input Capacitance
Analog Inputs
Maximum Signal Level
Differential Input Voltage
Range Channel 0
Differential Input Voltage
Range Channel 1
Input Impedance
Bandwidth
(Notch Frequency)
Oscillator Input
Frequency Range
Power Specifications
Operating Voltage
I
DD,A
I
DD,D
Note 1:
I
DD,A
I
DD,D
4.5
—
—
—
2.7
1.2
5.5
3.0
2.0
V
mA
mA
AV
DD,
DV
DD
AV
DD
pin only
DV
DD
pin only
MCLK
1
—
4
MHz
—
—
—
390
—
—
—
—
—
14
±1
±470/G
±660
—
—
V
mV
mV
kΩ
kHz
Proportional to 1/MCLK frequency
Proportional to MCLK frequency,
MCLK/256
CH0+,CH0-,CH1+,CH1- to A
GND
G = PGA Gain on Channel 0
2.2
3.2
—
—
—
—
2.6
—
10
V
kΩ
pF
Sym
Min
Typ
Max
Units
Comment
2:
3:
4:
5:
6:
7:
Measurement error = (Energy Measured By Device - True Energy)/True Energy * 100%. Accuracy is
measured with signal (±660 mV) on Channel 1. F
OUT0
, F
OUT1
pulse outputs. Valid from 45 Hz to 65 Hz.
See typical performance curves for higher frequencies and increased dynamic range.
Does not include internal V
REF
. Gain = 1, CH0 = 470 mVDC, CH1 = 660 mVDC, difference between
measured output frequency and expected transfer function.
Percent of HF
OUT
output frequency variation; Includes external V
REF
= 2.5V, CH1 = 100 mVRMS @
50 Hz, CH2 = 100 mVRMS @ 50 Hz, AV
DD
= 5V + 1V
pp
@ 100 Hz. DC PSRR: 5V ±500 mV
Error applies down to 60 degree lead (PF = 0.5 capacitive) and 60 degree lag (PF = 0.5 inductive).
Refer to
Section 4.0 “Device Overview”
for complete description.
Specified by characterization, not production tested.
1 MCLK period at 3.58 MHz is equivalent to less than <0.005 degrees at 50 or 60 Hz.
TEMPERATURE CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, V
DD
= 4.5V – 5.5V, A
GND
, D
GND
= 0V.
Parameters
Temperature Ranges
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
Note:
T
A
T
A
T
A
-40
-40
-65
—
—
—
+85
+125
+150
°C
°C
°C
(Note)
Sym
Min
Typ
Max
Units
Conditions
The MCP3905A/05L/06A operate over this extended temperature range, but with reduced performance. In
any case, the Junction Temperature (T
J
) must not exceed the Absolute Maximum specification of +150°C.
DS22011B-page 4
©
2006-2011 Microchip Technology Inc.
MCP3905A/05L/06A
TIMING CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, all parameters apply at AV
DD
= DV
DD
= 4.5V – 5.5V,
A
GND
, D
GND
= 0V, MCLK = 3.58 MHz; T
A
= -40°C to +85°C.
Parameter
Frequency Output
F
OUT0
and F
OUT1
Pulse Width
(Logic Low) for MCP3905A, MCP3906A
devices
HF
OUT
Pulse Width for MCP3905A,
MCP3906A devices
F
OUT0
and F
OUT1
Pulse Width
(Logic Low) for MCP3905L device
HF
OUT
Pulse Width for MCP3905L
device
F
OUT0
and F
OUT1
Pulse Period
HF
OUT
Pulse Period
F
OUT0
to F
OUT1
Falling-Edge Time
F
OUT0
to F
OUT1
Min Separation
F
OUT0
and F
OUT1
Output High Voltage
F
OUT0
and F
OUT1
Output Low Voltage
HF
OUT
Output High Voltage
HF
OUT
Output Low Voltage
High-Level Input Voltage
(All Digital Input Pins)
Low Level Input Voltage
(All Digital Input Pins)
Input Leakage Current
Pin Capacitance
Note 1:
2:
t
FW
—
Sym
Min
Typ
275
Max
—
Units
ms
Comment
984376 MCLK periods
(Note
1)
322160 MCLK periods
(Note
2)
465344 MCLK periods
(Note
1)
232672 MCLK periods
(Note
2)
t
HW
t
FW
t
HW
t
FP
t
HP
t
FS2
t
FS
V
OH
V
OL
V
OH
V
OL
V
IH
V
IL
—
—
90
130
—
—
—
ms
ms
ms
s
s
—
65
Refer to
Equation 4-1
Refer to
Equation 4-2
—
—
0.5 t
FP
4/MCLK
—
—
—
—
—
—
—
—
—
—
—
4.5
—
V
V
V
V
V
V
µA
pF
I
OH
= 10 mA, DV
DD
= 5.0V
I
OL
= 10 mA, DV
DD
= 5.0V
I
OH
= 5 mA, DV
DD
= 5.0V
I
OL
= 5 mA, DV
DD
= 5.0V
DV
DD
= 5.0V
DV
DD
= 5.0V
V
IN
= 0, V
IN
= DV
DD
Note 3
0.5
—
4.0
—
0.5
—
2.4
—
—
—
0.85
±3
10
3:
If output pulse period (t
FP
) falls below 984376*2 MCLK periods for MCP3905A/6A and 465344*2 MCLK
periods for MCP3905L, then t
FW
= 1/2 t
FP
.
If output pulse period (t
HP
) falls below 322160*2 MCLK periods for MCP3905A/6A and 232672*2 MCLK
periods for MCP3905L, then t
HW
= 1/2 t
HP
. When F2, F1,F0 = 011, t
HW
is fixed to 18 µs (64 MCLK
periods).
Specified by characterization, not production tested.
©
2006-2011 Microchip Technology Inc.
DS22011B-page 5
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