MCP3909
Energy Metering IC with SPI Interface and Active Power Pulse Output
Features
• Supports IEC 62053 International Energy
Metering Specification and legacy IEC 1036/
61036/687 Specifications
• Digital waveform data access through SPI
interface
- 16-bit Dual ADC output data words
- 20-bit Multiplier output data word
• Dual functionality pins support serial interface
access and simultaneous Active Power Pulse
Output
• Two 16-bit second order delta-sigma
Analog-to-Digital Converters (ADCs) with multi-bit
DAC
- 81 dB SINAD (typ.) both channels
• 0.1% typical active energy measurement error
over
1000:1
dynamic range
• PGA for small signal inputs supports low value
shunt current sensor
• 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 (maximum)
• Tamper output pin for negative power indication
• Industrial Temperature Range: -40°C to +85°C
Description
The MCP3909 device is an energy-metering IC
designed to support the IEC 62053 international
metering standard specification. It supplies a frequency
output proportional to the average active real power,
with simultaneous serial access to ADC channels and
multiplier output data. This output waveform data is
available at up to 14 kHz with 16-bit ADC output and
20-bit multiplier output words. The 16-bit, delta-sigma
ADCs allow for a wide range of I
B
and I
MAX
currents
and/or small shunt (<200 µOhms) meter designs.
A no-load threshold block prevents any current creep
measurements for the active power pulse outputs.
The integrated on-chip voltage reference has an
ultra-low temperature drift of 15 ppm per degree C.
This accurate energy metering IC with high field
reliability is available in the industry standard 24-lead
SSOP pinout.
Package Type
24-Lead
SSOP
DV
DD
HPF
AV
DD
NC
CH0+
CHO-
CH1-
CH1+
MCLR
REFIN / OUT
A
GND
F2 /
SCK
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 /
SDO
NC
CLKOUT
CLKIN
G0
G1
F0 /
CS
F1 /
SDI
Functional Block Diagram
G0 G1
HPF
F2/SCK F1/SDI F0/CS NEG/SDO
CH0+
CH0-
4 kΩ
REFIN/
OUT
2.4V
Reference
CH1+
CH1-
Clock
Sub-system
X
OSC1 OSC2
+
–
16-bit
Multi-level
DS ADC
16
16
HPF1
20
Active Power
DTF
conversion
Stepper
Motor
Output Drive
for
Active Power
HF
OUT
F
OUT0
F
OUT1
+
PGA
–
16-bit
Multi-level
DS ADC
16
HPF1
16
Serial Control
And Output
Buffers
MCLR
Dual Functionality Pin
Control
SPI
Interface
LPF1
©
2009 Microchip Technology Inc.
DS22025B-page 1
MCP3909
NOTES:
DS22025B-page 2
©
2009 Microchip Technology Inc.
MCP3909
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 to 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
Active Energy Measurement
Error
Sym
E
Min
—
Typ.
0.1
Max
—
Units
Comment
Active Power Measurement Accuracy
% F
OUT
Channel 0 swings 1000:1 range,
F
OUT0
, F
OUT1
Frequency outputs
only, does not apply to serial
interface data. (Note
1, Note 4)
% F
OUT
Frequency outputs only, does not
Max
apply to serial interface data.
Disabled when F2, F1, F0 = 0, 1, 1
(Note 5, Note 6)
% F
OUT
(Note 2, Note 5)
% F
OUT
F2, F1, F0 = 0, 1, 1
(Note 3)
% F
OUT
HPF = 1, Gain = 1
(Note 3)
No-Load Threshold/
Minimum Load
NLT
—
0.0015
—
System Gain Error
AC Power Supply Rejection
(output frequency variation)
DC Power Supply Rejection
AC PSRR
DC PSRR
—
—
—
1
0.01
0.01
5
—
—
(output frequency
variation)
Waveform Sampling
A/D Converter Signal-to-
Noise and Distortion Ratio
Bandwidth
(Notch Frequency)
Phase Delay Between
Channels
Note 1:
SINAD
—
81
—
dB
Applies to both channels,
V
IN
= 0 dBFS at 50 Hz
(V
IN
= Full Scale)
Applies to both channels,
MCLK/256
HPF = 0 and 1, < 1 MCLK period
(Note 4, Note 6, Note 7)
—
—
14
—
—
1/MCLK
kHz
s
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 75 Hz.
See typical performance curves for higher frequencies and increased dynamic range. This parameter is
not 100% production tested.
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 mV
RMS
@ 50 Hz,
CH2 = 100 mV
RMS
@ 50 Hz, AV
DD
= 5V + 1 V
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.
©
2009 Microchip Technology Inc.
DS22025B-page 3
MCP3909
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Specifications:
Unless otherwise indicated, all parameters apply at AV
DD
= DV
DD
= 4.5V to 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
ADC/PGA Specifications
Offset Error
Gain Error Match
Internal Voltage Reference
Voltage
Tolerance
Tempco
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
Oscillator Input
Frequency Range
Power Specifications
Operating Voltage
I
DD,A
I
DD,D
Note 1:
I
DD,A
I
DD,D
4.5
—
—
—
2.3
0.8
5.5
2.8
1.2
V
mA
mA
AV
DD,
DV
DD
AV
DD
pin only
DV
DD
pin only
MCLK
1
—
4
MHz
—
—
—
390
—
—
—
—
±1
±470/G
±660
—
V
mV
mV
kΩ
Proportional to 1/MCLK
CH0+,CH0-,CH1+,CH1- to A
GND
G = PGA Gain on Channel 0
2.2
3.2
—
—
—
—
2.6
—
10
V
kΩ
pF
—
—
—
2.4
±2
15
—
—
—
V
%
ppm/°C
V
OS
—
—
2
0.5
5
—
mV
Referred to Input, applies to both
channels
Sym
Min
Typ.
Max
Units
Comment
% F
OUT
(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 75 Hz.
See typical performance curves for higher frequencies and increased dynamic range. This parameter is
not 100% production tested.
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 mV
RMS
@ 50 Hz,
CH2 = 100 mV
RMS
@ 50 Hz, AV
DD
= 5V + 1 V
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.
DS22025B-page 4
©
2009 Microchip Technology Inc.
MCP3909
TEMPERATURE CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, V
DD
= 4.5V to 5.5V, A
GND
, D
GND
= 0V.
Parameters
Temperature Ranges
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, 24L-SSOP
Note:
θ
JA
—
73
—
°C/W
The MCP3909 operates 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.
T
A
T
A
T
A
-40
-40
-65
—
—
—
+85
+125
+150
°C
°C
°C
Note
Sym
Min
Typ
Max
Units
Conditions
©
2009 Microchip Technology Inc.
DS22025B-page 5
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