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SA9102F/SA9102H SINGLE PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH INSTANTANEOUS PULSE OUTPUT
FEATURES
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Performs bidirectional power and energy measurement Meets the IEC 521/1036 Specification requirements for Class 1 AC Watt hour meters Protected against ESD Power consumption rating typically 25mW
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Adaptable to different types of current sensors Operates over a wide temperature range Precision voltage reference on-chip Two output signal formats available
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DESCRIPTION The SAMES SA9102F and SA9102H Single Phase bidirectional Power/Energy metering integrated circuits generate pulse rate outputs for positive and negative energy directions, the frequency of which is proportional to the power consumption. These devices perform the calculation for active power. 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 power/energy metering integrated circuits are ideally suited for energy calculations in applications such as electricity dispensing systems (ED's), residential municipal metering and factory energy metering and control. The SA9102F and SA9102H integrated circuits are available in both 20 pin dual-inline plastic (DIP-20), as well as 20 pin small outline (SOIC-20) package types.
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PIN CONNECTIONS
IIN IIP VREF
1 2 3
20 19 18 17 16 15 14 13 12 11 DR-00906
GND IVP CON COP CIN CIP V SS DIR FOUT OSC1
CPON 4 CPOP 5 CPIN CPIP V DD TP9
6 7 8 9
OSC2 10
Package: DIP-20 SOIC-20
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PDS039-SA9102F-001 REV. B 08-01-97
SA9102F/SA9102H BLOCK DIAGRAM
V DD V SS
IIP
POWER
IIN
FOUT DIR
ANALOG SIGNAL PROCE-
INTEGRATOR
POWER TO FREQUENCY
VOLTAGE REF.
IVP GND
SSING OSC TIMING
DR-00907
VREF
OSC1
OSC2
ABSOLUTE MAXIMUM RATINGS* Parameter Symbol Supply Voltage VDD -VSS Current on any pin IPIN Storage Temperature TSTG 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.
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SA9102F/SA9102H ELECTRICAL CHARACTERISTICS (VDD = 2.5V, VSS = -2.5V, over the temperature range -10C to +70C#, unless otherwise specified.) Parameter Supply Voltage: Positive Supply Voltage: Negative Supply Current: Positive Supply Current: Negative Symbol Min VDD VSS IDD ISS 2.25 -2.75 5 5 Typ Max 2.75 -2.25 6 6 Unit Condition V V mA mA
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 Oscillator Pin VREF Ref. Current Ref. Voltage
#
IIV VOL VOH fP
-25
+25 VSS+1
A V V Hz Hz
Peak value IOL = 5mA IOH = -2mA Specified linearity Min and max limits
VDD-1 0 0 64 180
Recommended crystal: TV colour burst crystal f = 3.5795 MHz -IR VR 45 1.1 50 55 1.3 A V With R = 24k connected to VSS Referred to VSS
Extended Operating Temperature Range available on request.
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SA9102F/SA9102H PIN DESCRIPTION Pin 20 8 14 19 1 2 11 10 12 13 4 5 6 7 15 16 17 18 3 9 Designation GND VDD VSS IVP IIN IIP OSC1 OSC2 FOUT DIR CPON CPOP CPIN CPIP CIP CIN COP CON VREF TP9 Connections for crystal or ceramic resonator (OSC1 = Input ; OSC2 = Output) Pulse rate output Direction indication output Connections for outer loop capacitor of A/D converter (Voltage) Connections for inner loop capacitor of A/D converter (Voltage) Connections for inner loop capacitor of A/D converter (Current) Connections for outer loop capacitor of A/D converter (Current) Connection for current setting resistor Test Pin. Connect to VSS Description Ground Positive Supply Voltage Negative Supply Voltage Analog input for Voltage Inputs for current sensor
FUNCTIONAL DESCRIPTION The SA9102F/SA9102H are CMOS mixed signal Analog/Digital integrated circuits, which perform bidirectional power/energy calculations across a power range of 1000:1, to an overall accurancy of better than Class 1. These integrated circuits includes all the required functions 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 instataneous power measured. Direction information is also provided.
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SA9102F/SA9102H 1. Power calculation In the Application Circuit (Figure 1), the voltage drop across the shunt will be between 0 and 16mV (0 to 80A through a shunt resistor of 200). This voltage is converted to a current of between 0 and 16A, by means of resistors R 1 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 14V. The current into the A/D converter input is set at 14A 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 SA9102F and SA9102H power meter chips at FOUT (Pin 12) is 64Hz. In this case 1 pulse will correspond to an energy consumption of 18.4kW/ 64Hz = 287.5Ws. 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 AV generate virtual shorts on the signal inputs. Exact duplications of the input currents are generated for the analog signal processing circuitry.
V DD
2.
IIP
CURRENT SENSOR INPUTS
V SS V DD
AI
IIN
V SS V DD
IVP VOLTAGE SENSOR INPUT
V SS
A
V
DR-00908
GND
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SA9102F/SA9102H 3. Electrostatic Discharge (ESD) Protection The SA9102F/SA9102H integrated circuits inputs/outputs are protected against ESD. Power Consumption The power consumption rating of the SA9102F and SA9102H integrated circuits is less than 30mW. Pulse Output Signals The calcualted power is divided down to a pulse rate of 64Hz, for rated conditions on FOUT (Pin 12), for both the SA9102F and SA9102H. The format of the pulse output signal, which provides power/energy and direction information, is the only difference between the SA9102F and SA9102H devices. The direction of the energy flow is defined by the mark/space ratio in the SA9102F, while the pulse width defines the direction on the SA9102H. Waveform on FOUT (Pin 12)
4.
5.
Positive Energy Flow
Negative Energy Flow
SA9102F
SA9102H
t pp
mm mm
t pp
t pn
mm
t pn
mm
t pp = 1.1ms
t pn = 3.4ms
Waveform on DIR (Pin 13)
DR-00909
An integrated anticreep function ensures no metering at zero line currents.
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SA9102F/SA9102H The formula for calculating the output frequency (f) is given below: f = 11.16 * FOUTX * Where FOUTX FOSC II IV IR FOSC 3.58MHz * II .IV IR 2
= Nominal rated frequency (64Hz) = Oscillator frequency (2MHz ...... 4MHz) = Input currents for current inputs (16A at rated) = Input currents for voltage inputs (14A at rated) = Reference current (typically 50A)
XTAL is a colour burst TV crystal (f = 3.5795MHz) for the oscillator. The oscillator frequency is divided down to 1.7897MHz on-chip, to supply the digital circuitry and the A/d converters. 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 SA9102F and SA9102H integrated circuits are: C1 and C2 are the outer loop capacitors for the two integrated oversampling A/D converters. The value of these capacitors is 560pF. The actual values determine signal to noise and stability performance. The tolerances should be within 10%. C3 and C4 are the inner loop capacitors of the A/D converters. The optimum value is 3.3nF. The actual values are uncritical. Values smaller than 0.5nF and larger than 5nF should be avoided. 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 16A into the SA9102F/SA9102H at maximum line current. Values for RSH of less than 200 should be avoided. R1 = R2 = (IL/16A) * RSH/2 Where IL = Line current RSH = Shunt resistor/termination resistor sames
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SA9102F/SA9102H 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. 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%). Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.
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SA9102F/SA9102H Parts List for Application Circuit: Figure 1 Item Symbol Description 1 IC-1 SA9102F/SA9102H 2 D1 Diode, Silicon, 1N4148 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 D2 ZD1 ZD2 XTAL R1 R2 R3 R4 R5 R6 R7 R9 R10 C1 C2 C3 C4 C9 C10 C11 C13 C14 C15 RSH Diode, Silicon, 1N4148 Diode, Zener, 2.4V, 200mW Diode, Zener, 2.4V, 200mW Crystal, 3.5795MHz Resistor, 1% metal Resistor, 1% metal Resistor, 390k, (230VAC) 1%, metal Resistor, 1M, 1/4W, 1%, metal Resistor, 470, 2W, 1%, carbon Resistor, 24k, 1/4W, 1%, metal Resistor, 24k, 1/4W, 1%, metal Resistor, 680, 1/4W, 1% Resistor, 680, 1/4W, 1% Capacitor, 560pF Capacitor, 560pF Capacitor, 3.3nF Capacitor, 3.3nF Capacitor, 100nF Capacitor, 100nF Capacitor, 0.47F, 250VAC, polyester Capacitor, 100F Capacitor, 100F Capacitor, 820nF Shunt Resistor
Detail DIP-20/SOIC-20
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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SA9102F/SA9102H
Figure 2: Application Circuit using a Current Transformer for Current Sensing.
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SA9102F/SA9102H Parts List for Application Circuit: Figure 2 Item Symbol 1 IC-1 2 XTAL 3 RSH 4 R1 5 R2 6 R3 7 R4 8 R6 9 R7 10 R8 11 R9 12 C1 13 C2 14 C3 15 C4 16 C9 17 C10 18 C11 19 CT Note 1: Note 2: Note 3: Note 4: Description SA9102F/SA9102H 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, 560pF Capacitor, 560pF Capacitor, 3.3nF Capacitor, 3.3nF Capacitor, 820nF Capacitor, 100nF Capacitor Current Transformer Detail DIP-20/SOIC-20 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 for DC blocking and to minimize phase error introduced by current transformer (typically 1.5F).
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SA9102F/SA9102H ORDERING INFORMATION Part Number Package SA9102FPA DIP-20 SA9102FSA SA9102HPA SA9102HSA SOIC-20 DIP-20 SOIC-20
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SA9102F/SA9102H NOTES:
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SA9102F/SA9102H
Disclaimer: The information contained in this document is confidential and proprietary to South African MicroElectronic 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 out 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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