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Número de pieza SA2007P
Descripción Programmable Single Phase Energy Metering IC with Tamper Detection
Fabricantes Sames 
Logotipo Sames Logotipo



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Programmable Single Phase Energy Metering
IC with Tamper Detection
SA2007P
sames
FEATURES
+ Provides direct interface to mechanical counters
+ Calibration and setup stored on external EEPROM - no
trimpots required
+ Monitors both Live and Neutral for tamper detection
+ Flexible programmable features
+ Meets the IEC 521/1036 Specification for Class 1 AC Watt
hour meters
DESCRIPTION
The SAMES SA2007P is a single phase bi-directional energy
metering integrated circuit. It provides a cost effective solution
for energy meters with electro-mechanical displays, such as
stepper motors and impulse counters. A precision oscillator,
that replaces an external crystal is integrated on chip.
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
+ Total power consumption rating below 50mW
+ Adaptable to different types of sensors
+ Operates over a wide temperature range
+ Precision voltage reference on-chip
+ Precision oscillator on chip
continuously measured and the larger of the two is selected for
energy metering.
The SA2007P drives the calibration LED, the indicator LEDs
and the electro-mechanical counter directly.
The SA2007P does not require any external trim-pots. All
required calibration and configuration data is read from a small
external EEPROM.
The SA2007P integrated circuit is available in 20 pin dual-in-
line plastic (DIP-20) and small outline (SOIC-20) package
types.
VDD VSS
IIN1
IIP1
IIN2
IIP2
IVP
GND
ANALOG
SIGNAL
PROCESSING
AND
POWER
CALCULATION
POWER 1 (DIGITAL)
POWER 2 (DIGITAL)
COM-
PARATOR
VOLTAGE
REF.
OSC
IIC
BUS
INTERFACE
POWER
TO
PULSE
RATE
Dr-01594
VREF
TCLK SCL SDA RLOAD TEST
Figure 1: Block diagram
ELT
SEL1
DIRO
LED
MOP
MON
SPEC-0074 (REV. 2)
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PRELIMINARY
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SA2007P pdf
SA2007P
sames
INPUT SIGNALS
VREF
A bias resistor of 24kW set optimum bias and reference
conditions on chip. Calibration of the SA2007P should be done
as described in the Device Configuration section.
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 SA2007P. An external pull up resistor in not
needed.
Serial Clock (SCL)
The SCL pin connects directly to the SCL pin 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 in not
needed.
Configuration Reload (RLOAD)
A falling edge on the RLOAD pin, will trigger a register update
from the external EEPROM. This feature may be used during
calibration to load updated register data in the SA2007P. For
normal operation of the SA2007P the RLOAD pin may be left
floating.
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.
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 pulse per
second tLED is 71µs, for the other options tLED is 10ms. The LED
output is active low as in figure 5.
An integrated anti-creep function prevents any output pulses if
the measured power is less than 0.02% of the meters rated
current.
MOP
VDD
VSS
Selected Input Indicator (SEL1)
The SA2007P continuously compares the power
consumptions on current channel 1 inputs and current channel
2 inputs. The larger of the two measurements is used for
metering. The SEL1 output pin indicates which channel is
currently being used for the pulse output.
Signal
Output
SEL 1
Value
Description
0 Channel 1 selected (IIN1/IIP1)
1 Channel 2 selected (IIN2/IIP2)
Switching between channels will not be faster than once per
second in case both channels are balanced.
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 SA2007P
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 SA2007P provides information about the energy flow
direction of both current channels on pin DIRO .
A logic 1 on pin DIRO indicates reverse energy flow of both
current channels. 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 both current sense input
are in phase, is indicated on pin DIRO as a logic 0.
The DIRO output will toggle between 1 and 0 a rate of 1Hz in
case one of the current channels measure positive energy and
the other negative energy. The condition may accure with a
improper installed or tampered meter.
The DIRO pin may be used to drive a LED in order to indicate
reverse energy.
Signal
Output
Value
Description
1 Reverse energy flow
DIRO
0 Forward energy flow
1Hz Out of phase current channels
MON
VDD
VSS
DR-01559
tm tm tm
Figure 4: Motor drive on MON and MOP pins
LED
VDD
VSS
DR-01332
tLED
Figure 5: LED pulse output
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PRELIMINARY

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SA2007P arduino
SA2007P
sames
Parts List for Application Circuit: Figure 7
Item
Symbol Description
1 U1 SA2007P
2 U2 AT24C01, or equivalent device
3 D1 Diode, Silicon 1N4148
4 D2 Diode, Silicon 1N4148
5 D3 Diode, Silicon 1N4148
6 D4 Diode, Silicon 1N4148
7
LED1
Light emitting diode, Green
8 LED2 Light emitting diode, Amber
9 LED3 Light emitting diode, Red
10 LED4 Light emitting diode, Green
11 R1 Resistor, 120k, 1/4W, 1%, metal
12 R2 Resistor, 120k, 1/4W, 1%, metal
13 R3 Resistor, 120k, 1/4W, 1%, metal
14 R4 Resistor, 10W, 2W, Wire wound
15 R5 Resistor, 24k, 1/4W, 1%, metal
16 R6 Resistor, 24k, 1/4W, 1%, metal
17 R7 Resistor, 1M, 1/4W, 1%, metal
18 R8 Resistor, 1/4W, 1%, metal
19 R9 Resistor, 1/4W, 1%, metal
20 R10 Resistor, 1/4W, 1%, metal
21 R11 Resistor, 1/4W, 1%, metal
22 R12 Resistor, 1/4W, 1%, metal
23 R13 Resistor, 1/4W, 1%, metal
24 R14 Resistor, 1k, 1/4W
25 R15 Resistor, 1k, 1/4W
26 R16 Resistor, 1k, 1/4W
27 R17 Resistor, 1k, 1/4W
28 R18 Resistor, 1k, 1/4W, 1%, metal
29 R19 Resistor, 1k, 1/4W, 1%, metal
30 C1 Capacitor
31 C2 Capacitor, 220nF
32 C3 Capacitor, 220nF
33 C4 Capacitor, 820nF
34 C5 Capacitor, 2200µF, 25V, electrolytic
35 C6 Capacitor, 100µF, 16V, electrolytic
36 CT1 Current Transformer
37 CT2 Current Transformer
38 T1 Transformer, 230V/9V
39 U1 78LC05, Voltage regulator
40 CNT1 Bipolar step motor
41 TZ1 400V, Metal oxide varistor
Detail
DIP-20/SOIC-20
or Similar
or Similar
or Similar
or Similar
Note 2
Note 2
Note 1
Note 1
Note 1
Note 1
Note 4
Note 3
Note 1: Resistor (R10, R11, R12 and R13) values are dependent upon the selected value of R8 and R9
Note 2: See TYPICAL APPLICATION when selected the value of R8 and R9.
Note 3: Capacitor (C4) to be positioned as closed to Supply Pins (VDD & VSS) of U-1, as possible.
Note 4: Capacitor (C1) selected to minimize phase error introduced by current transformer (typically 1.5µF for normal CTs)
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PRELIMINARY

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