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SA9102C SINGLE PHASE UNIDIRECTIONAL POWER/ENERGY METERING IC PULSE OUTPUT
FEATURES
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Performs unidirectional power and energy measurement Meets the IEC 521/1036 Specification requirements for Class 1 AC Watt hour meters Protected against ESD Total 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 Different pulse rate options available
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DESCRIPTION The SAMES SA9102C Single Phase unidirectional Power/Energy metering integrated circuit generates a pulse rate output, the frequency of which is proportional to the power consumption. The SA9102C performs the calculation for active power. This method of calculation takes the power factor into account. Energy consumption is determined by the power measurement being integrated over time. This innovative universal single phase power/energy metering integrated circuit is ideally suited for energy calculations in applications such as electricity dispensing systems (ED's), residential municipal metering and factory energy metering and control. The SA9102C integrated circuit is available in both 20 pin dual-in-line plastic (DIP-20), as well as 20 pin small outline (SOIC-20) package types.
2047
PIN CONNECTIONS
IIN IIP VREF CVON CVOP CVIN CVIP V DD NC OSC2
1 2 3 4 5 6 7 8 9 10 DR-00020
20 19 18 17 16 15 14 13 12 11
GND IVP CION CIOP CIIN CIIP V SS FOUT2 FOUT1 OSC1
Package: DIP-20 SOIC-20
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PDS039-SA9102C-001 REV. D 05-09-1995
SA9102C BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS* Parameter Symbol Supply Voltage V DD -VSS Current on any pin IPIN Storage Temperature TSTG Operating Temperature TO
Min -0.3 -200 -40 -40
Max 6.0 +200 +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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SA9102C 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 VDD VSS IDD ISS Min 2.25 -2.75 5 5 Typ Max 2.75 -2.25 10 10 Unit V V mA mA Condition
Current Sensor Inputs (Differential) Input Current Range III -25 +25 A Peak value
Voltage Sensor Input (Asymetrical) Input Current Range Pins FOUT1, FOUT2 Output Low Voltage Output High Voltage Pulse Rate FOUT1 FOUT21 Oscillator Pin VREF Ref. Current Ref. Voltage IIV VOL VOH fP fP2 -25 +25 VSS -1 V DD-1 10 0.5 fP/290 1160 1600 A V V Hz Hz Peak value IOL = 5mA IOH = -2mA Specified linearity Min and max limits
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
Note 1: An option of FOUT2 = fp/4 is available on request.
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Extended Operating Temperature Range available on request.
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SA9102C 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 FOUT1 FOUT2 CVON CVOP CVIN CVIP CIIP CIIN CIOP CION VREF NC Connections for crystal or ceramic resonator (OSC1 = Input : OSC2 = Output) First pulse rate output Second pulse rate 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 Not connected Description Ground Positive Supply Voltage Negative Supply Voltage Analog input for Voltage Inputs for current sensor
FUNCTIONAL DESCRIPTION The SA9102C 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 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. The SA9102C generates pulses, the frequency of which is proportional to the power consumption. Two frequency outputs' (FOUT1 and FOUT2) are available, with a third frequency option available on request.
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SA9102C 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 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 14V. The current into the A/D converter input is set at 14A for a nominal mains voltage, via the resistor R4 (1M). In this configuration, with a mains voltage of 230V and a current of 80A, the output frequency of the SA9102C power meter chip at FOUT1 (Pin 12) is 1.16kHz. In this case 1 pulse will correspond to an energy consumption of 18.4kVA/1160Hz = 15.9Ws. The output frequency at FOUT2 is FOUT1 /290 (i.e. The frequency ouput at pin 12 is divided by 290). 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, in conjunction with the amplifiers input configuration. 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
IIP
CURRENT SENSOR INPUTS
V SS V DD
AI
IIN
V SS V DD
IVP VOLTAGE SENSOR INPUT
V SS
A
V
DR-00502
GND
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SA9102C 3. Electrostatic Discharge (ESD) Protection The SA9102C integrated circuit's inputs/outputs are protected against ESD according to Mil-Std 883C, method 3015. Power Consumption The power consumption rating of the SA9102C integrated circuit is less than 50mW.
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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 circuit 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 SA9102C integrated circuit 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 the 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 SA9102C 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 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%).
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SA9102C The formula for calculating the output frequency (f) is given below: f = 11.16 * FOUTX * Where FOUTX FOSC II IV IR FOSC 3.58MHz * I I . IV IR 2
= Nominall rated frequency (4Hz or 1160Hz) = Oscillator frequency (2MHz ...... 4MHz) = Input currents for current input (16A at rated) = Input current for voltage input (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.
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SA9102C
Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.
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SA9102C Parts List for Application Circuit: Figure 1
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 Symbol IC-1 IC-2 D1 D2 ZD1 ZD2 XTAL R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 C1 C2 C3 C4 C9 C10 C11 C13 C14 C15 RSH Description SA9102C Optocoupler 4N35 Diode, Silicon, 1N4148 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, 1/8W, 1%, metal Resistor, 470, 1W, 5%, carbon Resistor, 24k, 1/4W, 1%, metal Resistor, 24k, 1/4W, 1%, metal Resistor, 680, 1/4W, 1% 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 DIP-6
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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SA9102C
Figure 2: Application Circuit using a Current Transformer for Current Sensing.
Note: Capacitor C11 may be selected for phase compensation and DC blocking.
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SA9102C Parts List for Application Circuit: Figure 2
Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Symbol IC-1 XTAL RSH R1 R2 R3 R4 R6 R7 R8 R9 C1 C2 C3 C4 C9 C10 C11 CT Description SA9102C 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, 5% Resistor, 2.2k, 1/4W, 5% 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 1: See TYPICAL APPLICATIONS when selecting the value of RSH. Note 2: Resistor (R1and R2) values are dependant upon the selected value of RSH. Note 3: Capacitor (C9) to be positioned as close to Supply Pins (VDD & VSS) of IC-1, as possible. Note 4: Capacitor (C11) selected to minimize phase error introduced by current transformer (typically 1.5F)
ORDERING INFORMATION Part Number Package SA9102CPA DIP-20 SA9102CSA SOIC-20
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SA9102C
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.
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:
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012 333-6021 012 333-8071 sames
Tel: Fax:
Int +27 12 333-6021 Int +27 12 333-8071

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