Programmable Single Phase Energy Metering
IC with Tamper Detection
SA9607P
FEATURES
s
s
s
s
s
Provides direct interface to mechanical counters
Calibration and setup stored on external EEPROM - no
trimpots required
Monitors both Live and Neutral for tamper detection
Performs bidirectional energy measurement
Flexible programmable features
s
s
s
s
s
Meets the IEC 521/1036 Specification for Class 1 AC Watt
hour meters
Total power consumption rating below 25mW
Adaptable to different types of sensors
Operates over a wide temperature range
Precision voltage reference on chip.
DESCRIPTION
The SAMES SA9607P is a single-phase bidirectional energy
metering integrated circuit. It provides a cost effective solution
for energy meters with electro-mechanical displays, such as
stepper motors and impulse counters.
Two current sensor inputs allow the measurement of energy
consumption on both the live and neutral lines.
Direction detection of energy flow as well as other common
tamper conditions are flagged.
The power consumption on both the live and neutral are
continuously measured and the larger of the two is selected
for energy metering.
The SA9607P drives the calibration LED and the
electromechanical counter directly.
The SA9607P does not require any external trim-pots. All
required calibration and configuration data is read from a
small external EEPROM.
The SA9607P integrated circuit is available in 20 pin dual-in-
line plastic (DIP-20) and small outline (SOIC-20) package
types.
VDD VSS
IIN 1
IIP 1
IIN 2
IIP 2
IV P
GND
P O W ER 1 (D IG ITA L )
A N A LO G
S IG N AL
PRO-
C E S S IN G
AND
P O W ER
C A L-
C U L AT IO N
E LT
P O W ER 2 (D IG ITA L )
COM-
PA R AT O R
S E L1
V O LTAG E
R E F.
D r-0 1 5 65
OSC
IIC
BUS
IN T E R -
FA C E
P O W ER
TO
P U LS E
R AT E
D IR O
LE D
MOP
MON
VREF
OSC1 OSC2
SCL SDA
CNF
Figure 1: Block Diagram
SPEC-0006 (REV. 2)
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24-05-00
SA9607P
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: Positive
Supply Voltage: Negative
Supply Current: Positive
Supply Current: Negative
Current Sensor Inputs (Differential)
Input Current Range
Voltage Sensor Input (Asymmetrical)
Input Current Range
Pin CNF
Input High Voltage
Input Low Voltage
Pin MOP, MON, LED, SCL
Output High Voltage
Output Low Voltage
Pin SEL1, ELT, SDA, DIRO
Input High Voltage
Input Low Voltage
Pin VREF
Ref. Current
Ref. Voltage
Oscillator
#
Symbol
T
o
V
DD
V
SS
I
DD
I
SS
Min
-25
2.25
-2.75
Typ
Max
+85
2.75
-2.25
Unit
°C
V
V
mA
mA
Condition
5
5
6
6
I
II
-25
+25
µA
Peak value
I
IV
V
IH
V
IL
V
OH
V
OL
-25
V
DD
-1
+25
µA
V
V
V
Peak value
V
SS
+1
V
DD
-1
V
SS
+1
I
OH
= -2mA
I
OL
= 5mA
Bi-direct
V
V
IH
V
IL
-I
R
V
R
V
DD
-1
V
SS
+1
45
1.1
50
55
1.3
V
V
µA
V
With R = 24kΩ
connected to V
SS
Referred to V
SS
Recommended crystal:TV colour burst crystal f = 3.5795 MHz
Extended Operating Temperature Range available on request.
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
-25
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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SA9607P
PIN DESCRIPTION
PIN
20
8
14
19
1, 2
3, 4
5
6
7
Designation Description
GND
V
DD
V
SS
IVP
IIN1, IIP1
IIN2, IIP2
VREF
SCL
SDA
Analog Ground. The voltage to this pin should be mid-way between V
DD
and V
SS
.
Positive supply voltage. The voltage to this pin is typically +2.5V if a shunt resistor is used for current sensing
or in the case of a current transformer a +5V supply can be applied.
Negative Supply Voltage. The voltage to this pin is typical -2.5V if a shunt resistor is used for current sensing
or in the case of a current transformer a 0V supply can be applied.
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 for current sensor - channel 1 and Channel 2. The shunt resistor voltage from each channel is
converted to a current of 16µA
RMS
at rated conditions. The current sense input saturates at an input current
of ±25µA peak.
This pin provides the connection for the reference current setting resistor. A 24kΩ resistor connected to V
SS
set the optimum operating condition.
Serial clock output. This output is used to strobe data from the external EEPROM.
Serial data. Send and receive data from an external EEPROM.
9, 12 MON, MOP Motor pulse outputs. These outputs can be used to drive an impulse counter or stepper motor directly.
13
15
16
17
18
LED
CNF
SEL1
ELT
DIRO
Calibration LED output. Refer to section Led Output (LED) for the pulse rate output options.
Configure / Test input. For normal operation this pin must be connected to V
SS.
Current channel select output. This output indicates which channel is been used for kWh metering.
Earth loop tamper output. This output indicates an earth loop tamper condition.
Direction output. This output indicates the energy flow direction.
10, 11 OSC1, OSC2 Connections for a crystal or ceramic resonator. (OSC1 = input; OSC2 = Output)
ORDERING INFORMATION
IIN 1
IIP1
IIN 2
IIP2
VREF
SCL
SDA
VDD
MON
OSC 1
1
2
3
4
5
6
7
8
9
10
D R -0 155 7
20
19
GN D
IVP
Part Number
SA9607PPA
SA9607PSA
Package
DIP-20
SOIC-20
18 D IRO
17
16
15
ELT
SEL1
C NF
14 VSS
13
12
LED
MOP
11 OSC 2
Figure 2: Pin connections: Package: Dip-20, SOIC-20
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SA9607P
FUNCTIONAL DESCRIPTION
The SA9607P is a CMOS mixed signal analog/digital integrated
circuit, which performs power/energy calculations across a
power range of 1000:1, to an overall accuracy of better than
Class 1.
The integrated circuit includes all the required functions for
single 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 SA9607P incorporates an anti-tamper scheme
by continuously measuring the power consumption on both
LIVE and NEUTRAL lines. A fault is indicated when these
measurements differ by more than 12.5%. The SA9607P
generates pulses with a frequency proportional to the larger of
the two current measurements. The source (LIVE or NEUTRAL)
for these pulses is indicated on the SEL1 pin.
Various pulse outputs (MOP, MON and LED) are available.
The pulse rate on these pins follows the active power
consumption measured.
A low voltage stepper may be driven directly from the device
by connecting it between the MOP and MON pins, alternatively
an impulse counter may be driven directly by connecting it
between MOP and V
SS
.
The SA9607P configures itself from an external low cost
EEPROM that contain all meter configurations and calibration
data. No external trimming is required for this device. Calibration
of the device may be fully automated.
POWER CALCULATION
In Figure 7, the voltage drop across the current transformers
terminating resistor will be between 0 and 16mV
RMS
. These
voltages are converted to currents for each current sense
input, by means of resistors R
1
and R
2
(channel 1) as well as
R
3
and R
4.
(channel 2).
The current sense input saturates at an input current of ±25µA
peak. The mains voltage (230VAC) is divided down through a
divider to 14V
RMS
. The current into the A/D converter input is
set at 14µA
RMS
at nominal mains voltage, via resistor R
6
(1MΩ).
See Device Configuration for more details on the processing
of measured energy to frequency outputs.
ANALOG INPUT CONFIGURATION
The input circuitry of the current and voltage sensor inputs are
illustrated in figure 3. These inputs are protected against
electrostatic discharge through clamping diodes.
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
signal processing circuitry.
AUTOMATIC DEVICE CONFIGURATION (BOOT UP)
During power up, registers containing configuration and
calibration information is updated from an external EEPROM.
The device itself never writes to the EEPROM so any write
protect features offered by manufacturer of EEPROM's may
be used to protect the configuration and calibration constants
of the meter. The device reloads its configuration every 1193
seconds from the external EEPROM in order to ensure correct
operation of the meter. Every data byte stored in the EEPROM
is protected with a checksum byte to ensure data integrity.
ELECTROSTATIC DISCHARGE (ESD)
PROTECTION
The SA9607P integrated circuit's input's/outputs are protected
against ESD.
POWER CONSUMPTION
The power consumption rating of the SA9607P integrated
circuit is less than 30mW.
V DD
IIP
CURRENT
SENSOR
INPUTS
V SS
A
I
V DD
IIN
V SS
V DD
IVP
VOLTAGE
SENSOR
INPUT
V SS
A
V
GND
DR-01288
Figure 3: Analog Input Internal Configuration
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SA9607P
INPUT SIGNALS
VREF
The VREF pin is the reference for the bias resistor and is the
recommended point for analog calibration. With a bias resistor
of 24kΩ optimum conditions are set. Any changes to the bias
resistor will affect the output pulse rate quadratically (i.e.(R
= +5%,(f=10%).
Serial Data SDA
The SDA pin connects directly to the SDA pin of an external
EEPROM. The pin is used to transfer data between the
EEPROM to the SA9607P. An external pull up resistor in not
needed.
Serial Clock SCL
The SCL pin connects directly to the SCL of an external
EEPROM. The SCL output is used to strobe data at a rate of
50kHz out of the EEPROM. An external pull up resistor is not
needed.
Configuration CNF
A rising edge on the CNF pin, with DIRO high, will trigger a
register update from the external EEPROM. This feature may
be used during calibration to load updated register data in the
SA9607P. For normal operation of the SA9607P the CNF pin
should be connected to V
SS
.
VDD
L ED
VSS
D R -013 32
t
LED
t
LED
= 10ms (6400 or 3200 pulses per kWh)
t
LED
= 71µs (1252 pulses per second)
Figure 5: LED pulse output
Selected input indication (SEL1)
The SA9607P continuously compares the power consumptions
on both channel 1 and channel 2 inputs. The larger of the two
measurements are used for pulse output generation. The
SEL1 output pin indicates which channel is currently being
used for the pulse output.
Signal
Output
SEL1
Value Description
0
1
Current Channel 1 selected (IIN1 / IIP1)
Current Channel 2 selected (IIN2 / IIP2)
OUTPUT SIGNALS
Motor output (MOP, MON)
The motor pulse width is programmable for 71ms and 142ms.
The MON pulse will follow the MOP pulse within the selected
pulse width time. This prevents that the motor armature is in
the wrong position after a power failure. Both MOP and MON
outputs are active high. One energy pulse is represented by a
MOP pulse followed by a MON pulse. The motor drive wave
forms are shown in figure 4.
VDD
MOP
VSS
VDD
MON
VSS
D R -0 1 5 5 9
Earth loop tamper indication (ELT)
In case the power measurements from both current channels
differ by more than 12.5%, (indicating a earth loop tamper
condition), the ELT output is set to zero. The SA9607P
continues to generate output pulses from the larger of the two
measured powers in this condition. The ELT output is active
low.
Direction indication (DIRO)
The SA9607P provides information about the energy flow
direction on pin DIRO. A logic 1 on pin DIRO indicates reverse
energy flow. Reverse energy flow is defined as the condition
where the voltage sense input and a 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 DIRO as a logic 0.
The DIRO pin may be used to drive a LED in order to indicate
reverse energy.
Signal
Output
DIRO
Value
1
0
Description
Reverse energy flow
Forward energy flow
t
m
t
m
t
m
t
m
= 71ms, 142ms
Figure 4: Motor drive on MON and MOP pins of device
LED output (LED)
Three options for the LED output pulse rate are available, 6400
and 3200 pulses per kWh, as well as a pulse rate of 1252
pulses per second at rated conditions. At 1252 pulses per
second t
LED
is 71µs, for the other options t
LED
is 10ms. The LED
output is active low as in figure 5.
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