MCP3909
Energy Metering IC with SPI Interface and Active Power Pulse Output
Features
• Supports IEC 62053 International Energy
Metering Specification
• 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 (typical) on Both Channels
• 0.1% Typical Active Energy Measurement Error
Over
1000:1
Dynamic Range
• PGA for Small Signal Input 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
• Temperature Ranges:
- Industrial: -40°C to +85°C
- Extended: -40°C to +125°C
Description
The MCP3909 device is an energy-metering IC
designed to support the IEC 62053 international meter-
ing standard specification. It supplies a frequency out-
put proportional to the average active real power, with
simultaneous serial access to ADC channels and mul-
tiplier output data. This output waveform data is avail-
able 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 measure-
ments 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 reli-
ability is available in the industry standard 24-lead
SSOP pinout.
Package Type
24-Lead
SSOP
DV
DD
HPF
AV
DD
NC
CH0+
CH0-
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
2006-2012 Microchip Technology Inc.
DS22025C-page 1
MCP3909
Functional Block Diagram
G0 G1
HPF
F2/SCK F1/SDI F0/CS NEG/SDO
CH0+
CH0-
4 k
REFIN/OUT
2.4V
Reference
CH1+
CH1-
Clock
Sub-system
X
OSC1 OSC2
+
–
16-bit
Multi-level
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
ADC
16
HPF1
16
Serial Control
And Output
Buffers
Dual Functionality Pin
Control
SPI
Interface
MCLR
LPF1
DS22025C-page 2
2006-2012 Microchip Technology Inc.
MCP3909
1.0
ELECTRICAL
CHARACTERISTICS
† Notice:
Stresses above those listed under "Maximum Rat-
ings" 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
(output frequency variation)
Waveform Sampling
A/D Converter Signal-to-
Noise and Distortion Ratio
Bandwidth
(Notch Frequency)
Phase Delay Between
Channels
Note 1:
SINAD
AC PSRR
DC PSRR
—
—
—
1
0.01
0.01
5
—
—
—
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 mea-
sured 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.
2006-2012 Microchip Technology Inc.
DS22025C-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 mea-
sured 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.
DS22025C-page 4
2006-2012 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:
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
TIMING CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, all parameters apply at AV
DD
= DV
DD
= 4.5V to 5.5V,
A
GND
, D
GND
= 0V, MCLK = 3.58 MHz; T
A
= -40°C to +85°C.
Parameter
Frequency Outputs
F
OUT0
and F
OUT1
Pulse Width
(Logic Low)
HF
OUT
Pulse Width
F
OUT0
and F
OUT1
Pulse Period
HF
OUT
Pulse Period
F
OUT0
to F
OUT1
Falling-Edge
Time
F
OUT0
to F
OUT1
Minimum Sepa-
ration
Digital I/O
F
OUT0
and F
OUT1
Output High
Voltage
F
OUT0
and F
OUT1
Output Low
Voltage
HF
OUT
and NEG Output High
Voltage
HF
OUT
and NEG 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:
3:
4:
V
OH
V
OL
V
OH
V
OL
V
IH
V
IL
4.5
—
—
—
—
—
—
—
0.1
—
—
Sym
t
FW
t
HW
t
FP
t
HP
t
FS2
t
FS
Min
—
Typ
275
90
Max
—
—
Units
ms
ms
s
s
Comment
984376 MCLK periods
(Note
1)
322160 MCLK periods
(Note
2)
—
Refer to
Equation 4-1
Refer to
Equation 4-2
—
—
0.5 t
FP
4/MCLK
—
—
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
±1
10
If output pulse period (t
FP
) falls below 984376*2 MCLK periods, then t
FW
= 1/2 t
FP
.
If output pulse period (t
HP
) falls below 322160*2 MCLK periods, then t
HW
= 1/2 t
HP
. When F2, F1, F0
equals 0,1,1, the HF
OUT
pulse time is fixed at 64 x MCLK periods or 18 µs for MCLK = 3.58 MHz.
Specified by characterization, not production tested.
Serial timings specified and production tested with 180 pF load.
2006-2012 Microchip Technology Inc.
DS22025C-page 5
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