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Single Phase Power/Energy Metering IC with Tamper Detection SA9607M
FEATURES
s s s s s Provides direct interface to mechanical counters Monitors Live and Neutral for tamper detection Performs bidirectional energy measurement Various setup modes selectable Meets the IEC 521/1036 Specification for Class 1 AC Watt hour meters s s s s 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 SA9607M is a single-phase bidirectional energy metering integrated circuit. It provides a mono-chip 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. 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 SA9607M drives the calibration LED and the electromechanical counter directly. The SA9607M integrated circuit is available in 20 pin dual-inline plastic (DIP-20) and small outline (SOIC-20) package types.
VDD VS S
IIN1 IIP1 IIN2 IIP2 IV P G ND
PO W ER 1 (D IG ITA L) ANA LO G SIG NAL PRO CES SING AND PO W ER CAL CUL ATIO N ELT PO W ER 2 (D IG ITA L) CO M PAR ATO R SE L1
VO LTAG E REF.
D r-0 15 58
O SC
PO W ER TO PUL SE RATE
DIR O L ED MOP MON
VRE F
O SC1 O SC2
M P1 M P0
RAT ED
Figure 1: Block Diagram
SPEC-0005 (REV. 2)
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SA9607M ELECTRICAL CHARACTERISTICS
(VDD = 2.5V, VSS = -2.5V, over the temperature range -10C to +70C#, 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 DIRO, LED Output High Voltage Output Low Voltage Pin MP0, MP1 Input High Voltage Input Low Voltage Pin MOP, MON Output High Voltage Output Low Voltage Pin RATED, SEL1, ELT Input High Voltage Input Low voltage Pin VREF Ref. Current Ref. Voltage Oscillator -I R VR 45 1.1 50 55 1.3 A V VOH VOL V DD-1 VSS+1 V V IOH = -2mA IOL = 5mA Bi-direct** VIH VIL V DD-1 VSS+1 V V With R = 24k connected to VSS Referred to VSS I IV VOH VOL VIH VIL -25 V DD-1 VSS+1 V DD-1 +25 A V V V V Peak value IOH = -2mA IOL = 5mA Pull down VSS+1 I II -25 +25 A Peak value Symbol To V DD VSS IDD I SS Min -25 2.25 -2.75 5 5 Typ Max +85 2.75 -2.25 6 6 Unit C V V mA mA Condition
Recommended crystal: TV colour burst crystal f = 3.5795 MHz
#
Extended Operating Temperature Range available on request. ** Switched to output mode every 1.1 seconds for 140 S.
ABSOLUTE MAXIMUM RATINGS*
Parameter Supply Voltage Current on any pin Storage Temperature Operating Temperature Symbol VDD -VSS IPIN TSTG TO 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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SA9607M PIN DESCRIPTION
PIN 20 8 14 19 1, 2 3, 4 5 6, 7 9, 12 13 15 16 17 18 Designation Description GND VDD VSS IVP IIN1, IIP1 IIN2, IIP2 VREF Analog Ground. The voltage to this pin should be mid-way between V DD and VSS. 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 typicall -2.5V if a shunt resistor is used for current sensing or in the case of a current transofer a 0V supply can be applied. The current into the A/D converter should be set at 14ARMS at nominal mains voltage. The voltage sense input saturates at an input current of 25A peak. Inputs for current sensor - channel 1 and Channel 2. The shunt resistor voltage from each channel is converted to a current of 16ARMS at rated conditions. The current sense input saturates at an input current of 25A peak. This pin provides the connection for the reference current setting resistor. A 24k resistor connected to VSS set the optimum operating condition.
MP0, MP1 Motor pulse rate select inputs. Described under Input Signals. MON, MOP Motor pulse outputs. These outputs can be used to drive an impulse counter or stepper motor directly. LED RATED SEL1 ELT DIRO Calibration LED output. Refer to section Led Output (LED) for the pulse rate output options. Rated condition select input. Described under Input Signals. 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 Part Number
IIN 1 IIP1 IIN 2 IIP2 VR EF M P1 M P0 VD D MON 1 2 3 4 5 6 7 8 9 20 19 GND IV P
Package DIP-20 SOIC-20
SA9607MPA SA9607MSA
1 8 D IR O 1 7 ELT 16 15 SE L1 R AT ED
1 4 VS S 1 3 L ED 12 MOP 11 O S C 2
D R -0 1557
OS C1 10
Figure 2: Pin connections: Package: Dip-20, SOIC-20
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SA9607M FUNCTIONAL DESCRIPTION
The SA9607M is a CMOS mixed signal analog/digital integrated circuit, which performs power/energy calculations across a power range of 1000:1, to an overall accurancy of better than Class 1. The integrated circuit includes all the required functions for 1phase 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 SA9607M 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 SA9607M 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. Frequency outputs (MOP, MON and LED) are available. The pulse rate on these pins follows the instantaneous 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 impulse counter may be driven directly by connecting it between MOP and VSS. conditions such as 230V/20A, 230V/40A and 230V/60A may be chosen with the rated pin. This facility allows meter manufacturers to cater for a wide range of metering applications with minimal design changes.
ANALOG INPUT CONFIGURATION
The input circuitry of the current and voltage sensor inputs are illustrated below. These inputs are protected against electrostatic discharge through clamping diodes. The feedback loops from the outputs of the amplifiers AI and A V generate virtual shorts on the signal inputs. Exact duplications of the input currents are generated for the analog signal processing circuitry.
ELECTROSTATIC DISCHARGE (ESD) PROTECTION
The SA9607M integrated circuit's input's/outputs are protected against ESD.
POWER CONSUMPTION
The power consumption rating of the SA9607M integrated circuit is less than 30mW.
V DD
POWER CALCULATION
In the Application Circuit (Figure 7), the voltage drop across the shunt will be between 0 and 16mVRMS (0 to 80A through a shunt resistor of 200). The voltage accross the current transformers terminating resistor will also be between 0 and 16mVRMS. These voltages are converted to currents of between 0 and 16ARMS for each current sense inputs by means of resistors R1 and R 2 (channel 1) as well as R3 and R4. (channel 2). The current sense input saturates at an input current of 25A peak. For the voltage sensor input, the mains voltage (230VAC) is divided down through a divider to 14VRMS. The current into the A/D converter input is set at 14ARMS at nominal mains voltage, via resistor R6 (1M). Different pulse rates are available at the MOP and MON pins. The device may be programmed for a 1 pulse/kWh, 10 pulses/ kWh or 100 pulses/kWh output, depending on the status of the motor pulse rate select pins MP0 and MP1. The LED pulse rate is fixed at 6400 pulses per kWh. Rated
IVP VOLTAGE SENSOR INPUT IIP
CURRENT SENSOR INPUTS
V SS
AI
V DD
IIN
V SS V DD
V SS
A
V
GND DR-01288
Figure 3: Analog Input Internal Configuration
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SA9607M
INPUT SIGNALS
VREF The VREF pin is the reference for the bias resistor and is the recommended point for calibration. With a bias resistor of 24k optimum conditions are set. It may be varied within 10% for calibration purposes. Any changes to the bias resistor will affect the output pulse rate quadratically (i.e.(R = +5%,(f=10%). Motor pulse rate select (MP1 and MP0) The pulse rate of the motor driver ouput of the SA9607M is selected by the inputs MP1 and MP0. Three pulse rate options are available as shown in the following table: Pulse rate selection Pulse Rate Selection
OUTPUT SIGNALS
Motor output (MOP, MON) The MON pulse will follow the MOP pulse within 142ms. This prevents that the motor armature is in the wrong position after a power failure. Both MOP and MON outputs are active high. The motor drive wave forms are shown below:
VDD MO P VSS VDD MO N VSS
D R -0 1 5 5 9
Input
MP1 V SS V SS VDD VDD MP0 VSS VDD VSS VDD
Motor drive output selection 1 10 100 Device test mode
tm
tm
tm
Unit
tm = 142ms Figure 5: Motor drive waveform
pulses/kWh pulses/kWh pulses/kWh LED output (LED) The LED output pulse at a fixed rate of 6400 pulses per kWh. The LED output is active low. The LED waveform is shown below:
Please note that the device will not perform metering functions as described in this document while in test mode.
VDD
Rated condition select (RATED) The rated condition select pin gives the option of having a 3:2:1 scaling ratio of the rated current easily available. This feature is particularly useful in circumstances where a manufacturer requires a meter for use in a system rated for two different conditions, for example 230V/60A and 230V/ 40A. With the rated condition select the SA9607M allows for the development of different rated meters requiring minimal changes. The following table below lists the options available (assuming the rated condition to be 230V/60A). Rated condition select (RATED) Signal Input RATED VSS OPEN VDD Rated Conditions 230V / 20A 230V / 40A 230V / 60A
LED VSS
D R - 01332
tL E D
tLED = 10ms Figure 4: LED pulse output
Selected input indication (SEL1) The SA9607M continuously compares the power consumptions on current channel 1 inputs and current channel 2 inputs. The larger of the two measurements are used for metering. The SEL1 output pin indicates which channel is currently being used for the pulse output. Signal Output SEL1 Value 0 1 Description Channel 1selected (IIN1/IIP1) Channel 2selected (IIN2/IIP2)
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SA9607M
Earth loop tamper indication (ELT) If the power measurments from both current channels differ by more than 12.5%, (indicating a earth loop tamper condition), the ELT output is set to zero. The SA9607M 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 SA9607M 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 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 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 Forware energy flow
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SA9607M TYPICAL APPLICATION
In Figure 1, the components required for a stand-alone power metering application, is shown. Current transformers are used for mains current sensing. The channel showing the highest power consumption will be selected by the SA9607M for energy metering. The most important external components for the SA9607M integrated circuit are the current sense resistors, the voltage sense resistors as well as the bias setting resistor. Current Sense Resistors The resistors R1, R2, R3 and R4 define the current level into the current sense inputs of the device. The component should be selected for input currents of 16ARMS into the current channels of the SA9607M at IMAX (rated current of the meter). The voltage drop of the resistors R10 and R17 should be at least 20mV. Current Channel 1 R1= R2= (IL/16A RMS) x R10/2 Current Channel 2 R3= R4= (IL/16A RMS) x R11/2 Where: IL = Line current/CT-ratio R10 = Termination resistor R11 = Termination resistor Voltage Sense Resistors R9, R8, R6 and R5 set the current for the voltage sense input. The values should be selected so that the input current into the voltage sense input (virtual ground) is set to 14ARMS. Bias Resistor R7 defines all on-chip bias and reference currents. With R7 = 24k, optimum conditions are set. R7 may be varied within 10% for calibration purposes. Any change to R7 will affect the output quadratically (i.e.: R 7 = +5%, fP = +10%).
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http://www.sames.co.za. Figure 7: Application Circuit
SA9607M
LO A D N L
R9
R8 C3 R5 R6 C4
D IR ELT
P1
R1 R2 R3 R4 R7 P2
C5
IC - 1 SA 9607 M
SEL
R 15 R 16 R 17
PUL SE MO TO R
R 18 M1
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D R -0 1 56 0
X TA L C6
R 12 D1 D2 MOV D3 D4 C1 IC2 R 13 C2 R 14
VDD
GND
VSS N L SU PPLY
SA9607M
Parts List for Application Circuit: Figure 7
Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 Note Note Note Note 1: 2: 3: 4: Symbol IC1 D1 D2 D3 D4 D5 D6 D7 D8 XTAL R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 P1 P2 C1 C2 C3 C4 C5 C6 CT1 CT2 TX IC2 M1 M0V Description SA9607M Diode, Silicon 1N4007 Diode, Silicon 1N4007 Diode, Silicon 1N4007 Diode, Silicon 1N4007 Light emmitting diode, Red Light emmitting diode, Green Light emmitting diode, Amber Light emmitting diode, Green Crystal, 3.5759MHz Resistor, 1/4W, 1%, metal Resistor, 1/4W, 1%, metal Resistor, 1/4W, 1%, metal Resistor, 1/4W, 1%, metal Resistor, 1M, 1/4W, 1%, metal Resistor, 24k, 1/4W, 1%, metal Resistor, 22k, 1/4W, 1%, metal Resistor, 180k, 1/4W, 1%, metal Resistor, 200k, 1/4W, 1%, metal Resistor, 1/4W, 1%, metal Resistor, 1/4W, 1%, metal Resistor, 10, 2W, Wire wound Resistor, 1k, 1/4W, 1%, metal Resistor, 1k, 1/4W, 1%, metal Resistor, 1k, 1/4W, 5%, carbon Resistor, 1k, 1/4W, 5%, carbon Resistor, 1k, 1/4W, 5%, carbon Resistor, 1k, 1/4W, 5%, carbon Multi-turn, Trim Pot Multi-turn, Trim Pot, 5k Capacitor, 100F, 16V, electrolytic Capacitor, 100F, 16V, electrolytic Capacitor Capacitor, 220nF Capacitor, 220nF Capacitor, 820nF Current Transformer Current Transformer Transformer, 230V/9V 78LC05, Voltage regulator Bipolar step motor 400V, Metal oxide varistor Detail DIP-20/SOIC-20
Note Note Note Note
1 1 1 1
Note 2 Note 2
Note 2
Note 4
Note 3
Resistor (R1, R2, R3 and R4) values are dependant upon the selected value of R10 and R11. See TYPICAL APPLICATION when selecting the value of R10 and R11. Capacitor (C6) to be positioned as closed to Supply Pins (VDD & VSS) of IC-1, as possible. Capacitor (C7) selected to minimize phase error introduced by current transformer (typically 1.5F for normal CT5, approx. 100nF)
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SA9607M DISCLAIMER:
The information contained in this document is confidential and proprietary to South African Micro-Electronic Systems (Pty) Ltd ("SAMES") and may not be copied or disclosed to a third party, in whole or in part, without the express written consent of SAMES. The information contained herein is current as of the date of publication; however, delivery of this document shall not under any circumstances create any implication that the information contained herein is correct as of any time subsequent to such date. SAMES does not undertake to inform any recipient of this document of any changes in the information contained herein, and SAMES expressly reserves the right to make changes in such information, without notification,even if such changes would render information contained herein inaccurate or incomplete. SAMES makes no representation or warranty that any circuit designed by reference to the information contained herein, will function without errors and as intended by the designer.
Any Sales or technical questions may be posted to our e-mail adress below: energy@sames.co.za
For the latest updates on datasheets, please visit our web site: http://www.sames.co.za. SOUTH AFRICAN MICRO-ELECTRONIC SYSTEMS (PTY) LTD Tel: (012) 333-6021 Tel: Int +27 12 333-6021 Fax: (012) 333-8071 Fax: Int +27 12 333-8071
P O Box 15888 33 Eland Street Lynn East 0039 Republic of South Africa
33 Eland Street Koedoespoort Industrial Area Pretoria Republic of South Africa
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