Three Phase Bidirectional Power/Energy
Metering IC with Instantaneous Pulse Output
SA2005F
FEATURES
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Functionally compatible with the SA9105F with reduced
external components
Performs bidirectional one, two or three phase power and
energy measurement
Meets the IEC 521/1036 Specification requirements for
Class 1 AC Watt hour meters
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Operates over a wide temperature range
Uses current transformers for current sensing
Easily adaptable to different signal levels
Precision voltage reference on chip
Precision oscillator on chip.
Protected against ESD
sames
DESCRIPTION
The SAMES SA2005F is an enhancement of the SA9105F. A
precision oscillator and the loop capacitors are integrated on
chip.
The SAMES SA2005F three phase bidirectional power/energy
metering integrated circuit generates pulse rate outputs for
positive and negative energy directions. The frequency of the
pulses is proportional to the measured power consumption.
The SA2005F performs active power calculation.
The method of calculation takes the power factor into account.
Energy consumption is determined by integrating the power
measurement over time.
This innovate universal three phase power/energy metering
integrated circuit is ideally suited for applications such as
residential and industrial energy metering and control.
The SA2005F integrated circuit is available in 20 pin dual-in-
line plastic (DIP-20), and 20 pin small outline (SOIC-20)
package types.
VDD VSS
PGM0 PGM1
IIN1
IIP1
IVN1
IIN2
IIP2
IVN2
IIN3
IIP3
IVN3
GND
I1
X
V1
I2
X
V2
I3
X
V3
INTEGRATE
AND
AVERAGE
POWER
TO
PULSE
RATE
FOUT
DIR
REF
TIMING & CONTROL
OSC
Dr-01570
VREF
TEST
Figure 1: Block Diagram
TCLK
SPEC-0042 (REV. 1)
1/10
03-07-00
SA2005F
ELECTRICAL CHARACTERISTICS
(V
DD
= 2.5V, V
SS
= -2.5V, over the temperature range -10°C to +70°C
#
, unless otherwise specified.)
Parameter
Operating temp. Range
Supply Voltage
Supply Current
Nonlinearity of Power
Calculation
Current Sensor Inputs (Diffferential)
Input Current Range
Voltage Sensor Input (Asymmetrical)
Input Current Range
Pins FOUT, DIR
Output Low Voltage
Output High Voltage
sames
Symbol
T
O
V
DD
- V
SS
I
DD
Min
-25
4.5
Typ
Max
+85
5.5
10
Unit
°C
V
mA
Condition
Output unloaded
1% - 100% of rated
power
-0.3
+0.3
%
I
II
-25
+25
µA
Peak value
I
IV
V
OL
V
OH
f
P
-25
V
DD
-1
+25
V
SS
+1
µA
V
V
Hz
Hz
Hz
Hz
V
V
µA
V
Peak value
I
OL
= 5mA
I
OH
= -2mA
MODES 0, 1, 2
Specified linearity
Min and Max limits
MODE 3
Specified linearity
Min and Max Limits
Pulse Rate: FOUT
0
0
0
0
V
DD
-1
64
200
1160
3500
f
P
Pin PGM0, PGM1, TEST, TCLK
High Voltage
Low Voltage
Pin VREF
Ref. Current
Ref. Voltage
V
IH
V
IL
-I
R
V
R
V
SS
+1
45
1.1
50
55
1.3
With R = 24kW
connected to V
SS
Referred to V
SS
ABSOLUTE MAXIMUM RATINGS*
Parameter
Supply Voltage
Current on any pin
Storage Temperature
Operating Temperature
Symbol
V
DD
-V
SS
I
PIN
T
STG
T
O
Min
-0.3
-150
-40
-40
Max
6.0
+150
+125
+85
Unit
V
mA
°C
°C
*Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress
rating only. Functional operation of the device at these or any other condition above those indicated in the operational sections of
this specification, is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability.
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3
SA2005F
PIN DESCRIPTION
PIN
16
6
14
17, 20, 3
19, 18, 2, 1,
5, 4
15
7, 10
8
Designation
GND
V
DD
V
SS
IVN1, IVN2, IVN3
Description
sames
Analog Ground. The voltage to this pin should be mid-way between V
DD
and V
SS
.
Positive Supply voltage.
Negative Supply voltage.
The current into the A/D converter should be set at 14µA
RMS
at nominal mains
voltage. The voltage sense input saturates at an input current of ±25µA peak.
Inputs from current sensors. The shunt resistor voltage from each channel is
IIN1, IIP1, IIN2, IIP2,
converted to a current of 16µA
RMS
at rated conditions. The current sense input
IIN3, IIP3
saturates at an input current of ±25µA peak.
VREF
TCLK, TEST
FOUT
This pin provides the connection for the reference current setting resistor.
A 24kW resistor connected to V
SS
sets the optimum operating condition.
Test inputs. For normal operation these pins must be connected to V
SS
.
Pulse rate output. The pulse frequency is proportional to the sum of the power
measured on all three phases. The pulse format also indicates the direction of
energy flow.
Direction output. This output indicates the direction of energy flow.
FOUT Pulse format Select. These inputs define the FOUT pulse width
and format.
9
12, 13
DIR
PGM0, PGM1
ORDERING INFORMATION
IIP2
IIN2
IVN3
IIP3
IIN3
VDD
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
IVN2
IIN1
IIP1
IVN1
GND
VREF
Part Number
SA2005FPA
SA2005FSA
Package
DIP-20
SOIC-20
TEST
FOUT
DIR
TCLK
14 VSS
13
12
11
PGM1
PGM0
NC
DR-01571
Figure 2: Pin connections: Package: DIP-20, SOIC-20
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SA2005F
FUNCTIONAL DESCRIPTION
The SAMES SA2005F is a CMOS mixed signal integrated
circuit, which performs three phase power/energy calculations
over a range of 1000:1, to an overall accuracy of better than
Class 1.
The SA2005F is functionally similar to the SA9105F. No
external loop capacitors are required and an precision
oscillator is integrated on chip.
The integrated circuit includes all the required functions for 3-
phase power and energy measurement such as oversampling
A/D converters for the voltage and current sense inputs, power
calculation and energy integration. Internal offsets are
eliminated through the use of cancellation procedures.
The SA2005F generates pulses with a frequency proportional
to the power measured. The pulse rate follows the
instantaneous power measured. The pulse frequency is
proportional to the total sum of the three phases.
sames
through clamping diodes, in conjunction with the amplifiers
input configuration. The feedback loops from the outputs of the
amplifiers A
I
and A
V
generate virtual shorts on the signal inputs.
Exact duplications of the input currents are generated for the
analog processing circuitry.
Voltage Reference Connection (VREF)
A bias resistor of 24k provides an optimum bias conditions on
chip. Calibration of the SA2005F should be done on the
voltage inputs of the device as described in Typical
Applications.
Current Sense Inputs (IIN1, IIP1, IIN2, IIP2, IIN3, IIP3)
At rated current the resistor values should be selected for input
currents of 16µA
RMS
. Referring to figure 5, the resistors R1 and
R2 on current channel 1, resistors R3 and R4 on current
channel 2 and resistors R5 and R6 on current channel 3, define
the current level into the current sense inputs of the SA2005F.
The current sense inputs saturates at an input current of ±25µA
peak. Resistors R25, R26 and R27 are the current transformer
termination resistors. The voltage drop across the termination
resistors should be at least 20mV at rated conditions. Values
for the current sense inputs are calculated as follows:
R
1
= R
2
= (I
L
/ 16µA
RMS
) x R
25
/ 2
R
3
= R
4
= (I
L
/ 16µA
RMS
) x R
26
/ 2
R
5
= R
6
= (I
L
/ 16µA
RMS
) x R
27
/ 2
Where:
I
L
= Line current/CT-ratio
V DD
POWER CALCULATION
In the application circuit (figure 5), the mains voltages from V1,
V2 and V3, are converted to currents and applied to the voltage
sense inputs IVP1, IVP2 and IVP3.
The current levels on the voltage sense inputs are derived from
the mains voltages (3 x 230VAC) being divided down to 14V
through voltage dividers. The resulting input currents into the
A/D converters are 14µA
RMS
through the resistors R8, R9 and
R10.
For the current sense inputs the voltage drop across the
current transformers terminating resistors are converted to
currents of 16µA
RMS
at rated conditions, by means of resistors
R1, R2 (Phase 1); R3, R4 (Phase 2) and R5, R6 (Phase 3). The
signals providing the current information are applied to the
current sensor inputs IIN1, IIP1, IIN2, IIP2 and IIN3, IIP3.
The output frequency of the SA2005F energy metering
integrated circuit at rated conditions is 64Hz on FOUT
(PGM0=0, PGM1=1).
One pulse (measured in Watt second) correspond to an energy
measured of 3 x I
RATED
x V
RATED
/ 64Hz.
For a more detailed description see the Input Signals section.
IIP
CURRENT
SENSOR
INPUTS
VSS
VDD
A
I
IIN
VSS
VDD
IVP
VOLTAGE
SENSOR
INPUT
V SS
A
V
INPUT SIGNALS
Analog Input Configuration
The current and voltage sensor inputs are illustrated in figure 3.
These inputs are protected against electrostatic discharge
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GND
DR-01288
Figure 3: Analog Input Internal Configuration
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SA2005F
Voltage Sense Inputs (IVN1, IVN2, IVN3)
The current into the voltage sense inputs (virtual ground)
should be set to 14µA
RMS
at rated voltage conditions. The
individual mains voltages are divided down to 14V
RMS
per
phase. The resistors R8, R9 and R10 set the current for the
voltage sense inputs. The voltage sense inputs saturate at an
input current of ±25µA peak.
Pulse Programming Inputs (PGM0, PGM1)
The pulse programming inputs PGM1 and PGM0 define the
representation of energy measured by the device on FOUT.
The table below shows the difference between the various
modes.
Mode PGM1 PGM0
0
1
2
3
0
0
1
1
0
1
0
1
Frequency
at rated
conditions
64Hz
64Hz
64Hz
1160Hz
Forward
Pulse
Width
1.14ms
1.14ms
1.14ms
71µs
Reverse
Pulse
Width
3.4ms
1.14ms
1.14ms
71µs
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DIR as a logic 1. The DIR pin may be used to drive a LED in
order to indicate reverse energy flow.
Frequency Output (FOUT)
The sum of the measured power, from the three phases
produce a pulse rate of 64Hz or 1160Hz (mode 3), at rated
conditions on FOUT. The format of the pulse output signal,
which provides power/energy and direction information is
shown in figure 4. Refer to Pulse Programming Inputs for pulse
widths.
The following equation may be used for calculating the output
frequency:
f = 11.16 x FOUTX x ((I
I1
x I
V1
)+(I
I2
x I
V2
)+(I
I3
x I
V3
)) / 3 x I
R
Where:
FOUTX = Nominal rated frequency (64Hz/1160Hz)
I
I1
, I
I2
, I
I3
= Input currents for current sensor inputs (16µA at rated
line current)
I
V1
, I
V2
, I
V3
= Input currents for voltage sensor inputs (14µA at
rated line voltage)
I
R
= Reference current (typically 50µA)
An integrated anti-creep function ensures that no pulses are
generated at zero line currents.
Test Inputs (TCLK, TEST)
The TEST and TCLK inputs are manufacturers test pins and
must be connected to VSS in a metering application.
OUTPUT SIGNALS
Direction Indication (DIRO)
The SA2005F indicates the measured energy flow direction on
pin DIR. A logic 0 on pin DIR indicates reverse energy flow.
Reverse energy flow is defined as the condition where the
voltage sense input and current sense input are out of phase
(greater than 90 degrees). Positive energy flow, when voltage
sense and current sense input are in phase, is indicated on pin
MODE 0
FOUT
ELECTROSTATIC DISCHARGE (ESD) PROTECTION
The SA2005F integrated circuit's inputs/outputs are protected
against ESD.
POWER CONSUMPTION
The overall power consumption rating of the SA2005F
integrated circuit is less than 50 mW with a 5V supply.
MODE1
FOUT
MODE2
FOUT
MODE3
FOUT
DIR
DR-01582
Note: Frequency of pulse rate in MODE 3 is 18 times higher than other modes
Figure 4: FOUT options
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