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SA9602F/SA9602J SINGLE PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH INSTANTANEOUS PULSE OUTPUT
FEATURES s Performs bidirectional power and energy measurement s Meets the IEC 521/1036 Specification requirements for Class 1 AC Watt hour meters s Protected against ESD DESCRIPTION The SAMES SA9602F is an enhancement of the SA9102F, as no external capacitors are required for the A/D converters. The SA9602J is an enhancement of the SA9102H. The SAMES SA9602F and SA9602J Single Phase bidirectional Power/Energy metering integrated circuits generate a pulse rate output, the frequency of which is proportional to the power consumption. Both devices perform the active power calculation. The method of calculation takes the power factor into account. Energy consumption is determined by the power measurement being integrated over time. These innovative universal single phase power/energy metering integrated circuits are ideally suited for energy calculations in applications such as residential municipal metering and factory energy metering and control. The SA9602F and SA9602J integrated circuits are available in both 14 and 20 pin dual-in-line plastic (DIP-14/DIP-20), as well
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PRELIMINARY
s
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Total power consumption rating below 25mW Adaptable to different types of current sensors Operates over a wide temperature range Precision voltage reference on-chip
as 20 pin small outline (SOIC-20) package types. Note that the 20 pin SA9602J is a direct replacement for the SA9102H. The SA9602H has a higher output pulse rate than the SA9102H. PIN CONNECTIONS
IIN IIP VREF TEST V DD OSC2 OSC1
1 2 3 4 5 6 7
1 4 GND 13 12 11 10 9 8
IVP TEST2 FMO V SS DIR FOUT1
D R -0 1 2 7 6
Package: DIP-14
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PDS039-SA9602F-00A REV.A 23-07-97
SA9602F/SA9602J PIN CONNECTIONS
IIN IIP VREF TP4 TP5 TP6 TEST V DD TP9 OSC2
1 2 3 4 5 6 7 8 9 10 D R -0 1 2 7 7
20 19 18 17 16 15 14 13 12 11
GND IVP TP17 TEST2 TP16 FMO V SS DIR FOUT OSC1
Package: DIP-20 SOIC-20 BLOCK DIAGRAM
TE S T
TE S T 2
VDD
V SS
I IP
POWER
I IN
FO U T D IR
ANALOG SIGNAL PROCE-
INTEGRATOR
POWER TO FREQUENCY
VOLTAGE REF.
IV P GND
SSING OSC TIMING
FM O
DR-01278
VREF
OS C1
OS C2
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SA9602F/SA9602J ABSOLUTE MAXIMUM RATINGS* Parameter Symbol Supply Voltage VDD -VSS Current on any pin IPIN Storage Temperature T STG Operating Temperature TO
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. ELECTRICAL CHARACTERISTICS (VDD = 2.5V, VSS = -2.5V, over the temperature range -10C to +70C#, unless otherwise specified.) Parameter Operating temperature range # Supply Voltage: Positive Supply Voltage: Negative Supply Current: Positive Supply Current: Negative TO V DD VSS IDD ISS -25 2.25 -2.75 5 5 +85 2.75 -2.25 6 6 C V V mA mA Symbol Min Typ Max Unit Condition
Current Sensor Inputs (Differential) Input Current Range III -25 +25 A Peak value
Voltage Sensor Input (Asymmetrical) Input Current Range Pins FOUT, DIR Output Low Voltage Output High Voltage Pulse Rate FOUT Pulse Width tp IIV VOL VOH fP tPP tpn sames -25 +25 V SS+1 64 180 1.1 3.4 A V V Hz Hz ms ms Peak value IOL = 5mA IOH = -2mA Specified linearity Min and max limits Positive energy flow Negative energy flow
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VDD-1 0 0
SA9602F/SA9602J ELECTRICAL CHARACTERISTICS (Continued) (VDD = 2.5V, VSS = -2.5V, over the temperature range -10C to +70C #, unless otherwise specified.) Parameter Symbol Min Typ Max Unit Condition Pin VREF With R = 24k Ref. Current -IR 45 50 55 A connected to VSS Ref. Voltage VR 1.1 1.3 V Referred to VSS Oscillator Recommended crystal: TV colour burst crystal f = 3.5795 MHz
#
Extended Operating Temperature Range available on request.
PIN DESCRIPTION 14 Pin 14 5 10 13 1 2 3 4 12 7 6 8 9 11 20 Pin 20 8 14 19 1 2 3 7 18 11 10 12 13 15 4 5 6 9 16 17 Designation GND VDD V SS IVP IIN IIP VREF TEST TEST2 OSC1 OSC2 FOUT DIR FMO TP4 TP5 TP6 TP9 TP16 TP17 Description Ground Positive Supply Voltage Negative Supply Voltage Analog input for Voltage Inputs for current sensor Connection for current setting resistor Test Pin. Tied to VSS for protection against HV transients and noise Test Pin. May be left unconnected or tie to Vss Connections for crystal or ceramic resonator (OSC1 = Input ; OSC2 = Output) Pulse rate output Direction indication output Rising edge of mains frequency Test Pins (Leave unconnected)
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SA9602F/SA9602J FUNCTIONAL DESCRIPTION The SA9602F and SA9602J are CMOS mixed signal Analog/Digital integrated circuits, which perform power/energy calculations across a power range of 1000:1, to an overall accurancy of better than Class 1. The integrated circuits include all the required functions for 1-phase power and energy measurement such as two 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. These devices generate pulses, the frequency of which is proportional to the power consumption. The pulse rate follows the instantaneous power consumption measured. Direction information is also provided. A voltage zero crossover signal, relevant to the positive going half cycle, is available on pin FMO. This signal can be used to sychronise circuit breaker switching. 1. Power Calculation In the Application Circuit (Figure 1), the voltage drop across the shunt will be between 0 and 16mVRMS (0 to 80A through a shunt resistor of 200). This voltage is converted to a current of between 0 and 16ARMS, by means of resistors R1 and R2. 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 R4 (1M). In this configuration, with a mains voltage of 230V and a current of 80A, the output frequency of the SA9602F and SA9602J power meter chip at FOUT is 64Hz. In this case 1 pulse will correspond to an energy consumption of 18.4kW/64Hz = 287.5Ws. 2. 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 A I and AV generate virtual shorts on the signal inputs. Exact duplications of the input currents are generated for the analog signal processing circuitry.
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SA9602F/SA9602J
V DD
IIP
CU RR E NT S E N S OR IN P U TS
VSS V DD
AI
IIN
V SS V DD
IV P V O LTA GE S E N S OR IN P U T
V SS
A
V
D R -009 08
GN D
3.
4.
5.
Electrostatic Discharge (ESD) Protection The SA9602F and SA9602J integrated circuit's inputs/outputs are protected against ESD Power Consumption The power consumption rating of the SA9602F and SA9602J integrated circuits is less than 25mW. Pulse Output Signals The calculated power is divided down to a pulse rate of 64Hz, for rated conditions on FOUT for both the SA9602F and SA9602J. The format on the pulse output signal, which provides power/energy and direction information, is the only difference between the SA9602F and SA9602J devices. The direction of the energy flow is defined by the mark/space ratio in the SA9602F, while the pulse width defines the direction on the SA9602J. Waveform on FOUT
Posit iv e Energ y F low N egativ e En erg y Flo w
SA9602F
SA9602J
tpp t p p = 1 . 1m s tpp tpn t p n = 3 . 4m s tpn
Waveform on DIR
D R -0 09 0 9
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SA9602F/SA9602J The diagram below shows the behavior of the direction indication, DIR, when energy reversal takes place. The timing period for the DIR signal to change state, tDIR, will be defined by the time it takes for the integrater to count down from its value at the time of energy reversal. This is determined by the energy consumption rate.
I t
V t
D IR
D R - 01 283
t t D IR
The square wave signal on FMO indicates the polarity of the mains voltage.
V
t
FM O
t t M A IN S
D R -0 1 2 8 4
Due to comparator offsets, the FMO low to high transition can occur within a range as shown above. The time between succesive low to high transitions will be equal to the mains voltage period.
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SA9602F/SA9602J TYPICAL APPLICATIONS In the Application Circuits (Figures 1 and 2), the components required for power metering applications, are shown. In Figure 1, a shunt resistor is used for current sensing. In this application, the circuitry requires a +2.5V, 0V, -2.5V DC supply. In the case of Figure 2, when using a current transformer for current sensing, a +5V, 0V DC supply is sufficient. The most important external components for the SA9602F and SA9602J integrated circuits are: R2, R1 and RSH are the resistors defining the current level into the current sense input. The values should be selected for an input current of 16ARMS into the SA9602F and SA9602J, at maximum line current. Values for RSH of less than 200 should be avoided. R1 = R2 = (IL/16ARMS )* RSH/2 Where IL = Line current RSH = Shunt resistor/termination resistor R3, R6 and R4 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 14A RMS. 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.: R7 = +5%, fP = +10%). The formula for calculating the output frequency is given below: f = 11.16 * FOUTX * Where FOUTX FOSC II IV IR FOSC 3.58MHz * II .IV IR2
= Normal rated frequency (64Hz) = Oscillator frequency (2MHz ...... 4MHz) = Input current for current input (16ARMS at rated) = Input current for voltage input (14ARMS at rated) = Reference current (typically 50A)
XTAL is a colour burst TV crystal (f = 3.5795 MHz) for the oscillator. The oscillator frequency is divided down to 1.7897 MHz on-chip, to supply the digital circuitry and the A/D converters.
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LOA D R6
R SH
Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.
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R2 R1 R4 R11
1 2 3 4 5 6 7
R3
C11 XTA L R7 C15
IC-1
R5
14 13 12 11 10 9 8
LED
NC
1 2 3
IC-2
6 NC 5 4
D1 R9 C9 ZD 1 ZD 2 C13 C14 R10
C10 R8
D2
SU PPLY
D R -01 2 80
SA9602F/SA9602J
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SA9602F/SA9602J Parts List for Application Circuit: Figure 1 Item Symbol Description 1 IC-1 SA9602F or SA9602J 2 IC-2 Optocoupler 4N35 3 D1 Diode, Silicon, 1N4148 4 D2 Diode, Silicon, 1N4148 5 ZD1 Diode, Zener, 2.4V, 200mW 6 ZD2 Diode, Zener, 2.4V, 200mW 7 XTAL Crystal, 3.5795MHz 8 R1 Resistor, 1% metal 9 R2 Resistor, 1% metal 10 R3 Resistor, 390k, (230VAC) 1%, metal 11 R4 Resistor, 1M, 1/4W, 1%, metal 12 R5 Resistor, 470, 2W, 5%, carbon 13 R6 Resistor, 24k, 1/4W, 1%, metal 14 R7 Resistor, 24k, 1/4W, 1%, metal 15 R8 Resistor, 680, 1/4W, 1% 16 R9 Resistor, 680, 1/4W, 1% 17 R10 Resistor, 680, 1/4W, 1% 18 R11 Resistor, 2.2K, 1/4W, 1% 19 C9 Capacitor, 100nF 20 C10 Capacitor, 100nF 21 C11 Capacitor, 0.47F, 250VAC, polyester 22 C13 Capacitor, 100F 23 C14 Capacitor, 100F 24 C15 Capacitor, 820nF 25 RSH Shunt Resistor 26 LED Light Emitting Diode
Detail DIP-14 DIP-6
Colour burst TV Note 1 Note 1
Note 2 Note 3
Note 1: Resistor (R1 and R2) values are dependant upon the selected value of RSH. Note 2: Capacitor (C15) to be positioned as close to Supply Pins (VDD & VSS) of IC-1 as possible. Note 3: See TYPICAL APPLICATIONS when selecting the value of RSH.
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LOAD
R3 C11 RSH
R6
CT
Figure 2: Application Circuit using a Current Transformer for Current Sensing.
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R2
1 2 3 14 13 12 4 5 6 7 11 10 9 8
R1
R4
IC-1
FM0 DIR FOUT
XTAL R7
5V R8 R9 C10
C9
2.4V TO2.6V DC
DR-01281
0V RSH = TERMINATION RESISTOR FOR CURRENTTRANSFORMER R1 = R2
N L SUPPLY
SA9602F/SA9602J
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SA9602F/SA9602J Parts List for Application Circuit: Figure 2 Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Note 1: Note 2: Note 3: Note 4: Symbol IC-1 XTAL RSH R1 R2 R3 R4 R6 R7 R8 R9 C9 C10 C11 CT Description SA9602F and SA9602J Crystal, 3.5795MHz Resistor Resistor, 1%, metal Resistor, 1%, metal Resistor, 390k, (230VAC), 1%, metal Resistor, 1M, 1/4W, 1%, metal Resistor, 24k, 1/4W, metal Resistor, 24k, 1/4W, 1%, metal Resistor, 2.2k, 1/4W, 1%, metal Resistor, 2.2k, 1/4W, 1%, metal Capacitor, 820nF Capacitor, 100nF Capacitor Current transformer Detail DIP-14 Colour burst TV Note 1 Note 2 Note 2
Note 3 Note 4
See TYPICAL APPLICATIONS when selecting the value of RSH. Resistor (R1and R2) values are dependant upon the selected value of RSH. Capacitor (C9) to be positioned as close to Supply Pins (VDD & VSS ) of IC-1, as possible. Capacitor (C11) selected to minimize phase error introduced by current transformer (typically 1.5F).
ORDERING INFORMATION Part Number Package SA9602FPA DIP-14 SA9602FPA DIP-20 SA9602FSA SOIC-20 SA9602JPA DIP-14 SA9602JPA DIP-20 SA9602JSA SOIC-20 Note: When ordering, the Package Option must be specified along with the Part Number.
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SA9602F/SA9602J Notes:
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SA9602F/SA9602J
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 address 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 P O Box 15888, 33 Eland Street, Lynn East, 0039 Koedoespoort Industrial Area, Republic of South Africa, Pretoria, Republic of South Africa Tel: Fax: 012 333-6021 012 333-8071 Tel: Fax: Int +27 12 333-6021 Int +27 12 333-8071
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