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SA9105E THREE PHASE UNIDIRECTIONAL POWER/ENERGY METERING IC WITH INSTANTANEOUS PULSE OUTPUT
FEATURES
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Performs unidirectional one, two or three phase power and energy measurement Meets the IEC 521/1036 Specification requirements for Class 1 AC Watt hour meters Operates over a wide temperature range
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Uses current transformers for current sensing Excellent long term stability Easily adaptable to different signal levels Precision voltage reference on-chip Three pulse rate options available Protected against ESD
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DESCRIPTION The SAMES SA9105E Three Phase unidirectional Power/Energy metering integrated circuit generates a pulse rate output, the frequency of which is proportional to the power consumption. The SA9105E performs 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. The output of this innovative universal three phase power/energy metering integrated circuit, is ideally suited for applications such as residential and industrial energy metering and control. The SA9105E integrated circuit is available in 40 pin dual-in-line plastic (DIP-40), as well as in 44 pin plastic leaded chip carrier (PLCC-44) package types.
PIN CONNECTIONS
CIN1 CIP2 CIN2 CIP3 CIN3 IIN1 IIP1 IIN2 IIP2 IIN3 IIP3 COPP CONP CIPP CINP V SS TP17 TP18 OSC1 OSC2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21
CIP1 COP1 CON1 CON2 COP2 GND IVP1 IVP2 IVP3 COP3 CON3 VREF V DD TP27 TP26 TP25 TP24 FOUT3 FOUT2 FOUT1
DR-00838
Package: DIP-40
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4262 PDS039-SA9105E-001 Rev. B 15-09-1995
SA9105E PIN CONNECTIONS
TP25 TP24 FOUT3 FOUT2 FOUT1 N.C. OSC2 OSC1 TP18 TP17 V SS
39 38 37 36 35 34 33 32 31 30 29
TP26 TP27 V DD VREF N.C. CON3 COP3 IVP3 IVP2 IVP1 GND
40 41 42 43 44 1 2 3 4 5 6
28 27 26 25 24 23 22 21 20 19 18
CINP CIPP CONP COPP N.C. IIP3 IIN3 IIP2 IIN2 IIP1 IIN1
7
8
9
10
11 12
13 14
15 16 17
DR-00840
BLOCK DIAGRAM
16 CONNECTIONS FOR LOOPCAPS V D D VSS
IVP1 IVP2 IVP3 IIP1 IIN1 IIP2 IIN2 IIP3 IIN3 GND OSC1 VREF
ANALOG INTEG. SIGNAL & PROAVERAGE CESSING
COP2 CON2 CON1 COP1 CIP1 N.C. CIN1 CIP2 CIN2 CIP3 CIN3
Package: PLCC-44
POWER
FOUT1
TO PULSE RATE
FOUT2 FOUT3
REF
TIMING & CONTROL
OSC
OSC2
DR-00839
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SA9105E ABSOLUTE MAXIMUM RATINGS * Parameter Symbol Supply Voltage VDD-VSS Current on any Pin IPIN Storage Temperature Operating Temperature TSTG 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 conditions above those indicated in the operation sections of this specification, is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (Over the temperature range -10C to +70C#, unless otherwise specified.) Parameter Supply Voltage Supply Current Nonlinearity of Power Calculation Symbol V DD-VSS IDD Min Typ 4.5 Max Unit Condition 5.5 V 15 mA +0.3 % 1% - 100% of rated power Peak value Peak value IOL = 5mA IOH = -2mA Specified linearity Min and max limits
-0.3
Current Sensor Inputs (Differential) Input Current Range III Voltage Sensor Inputs (Asymmetric) Input Current Range I IV Pins FOUT1,FOUT2,FOUT3 Output Low Voltage VOL Output High Voltage V OH Pulse Rate: FOUT1 FOUT2 FOUT3 Oscillator Pin VREF Ref. Current Ref. Voltage
#
-25 -25
+25 +25 V SS+1
A A V V Hz Hz
VDD-1 10 0.5 fp/4 fp/290 1160 3000
fp fp2 fp3
Recommended crystal: TV colour burst crystal, f = 3.5795 MHz With R = 24 k -I R 45 50 55 A connected to VSS VR 1.1 1.3 V Referred to V SS
Extended Operating Temperature Range available on request. sames
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SA9105E PIN DESCRIPTION
Pin PLCC 6 42 29 5 4 3 18 19 20 21 22 23 32 33 35 36 37 9 10 8 7 1 2 26 25 13 11 15 14 17 16 28 27 43 30 31 38 39 40 41
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Pin DIP 35 28 16 34 33 32 6 7 8 9 10 11 19 20 21 22 23 38 39 37 36 30 31 13 12 1 40 3 2 5 4 15 14 29 17 18 24 25 26 27
Designation GND VDD VSS IVP1 IVP2 IVP3 IIN1 IIP1 IIN2 IIP2 IIN3 IIP3 OSC1 OSC2 FOUT1 FOUT2 FOUT3 CON1 COP1 CON2 COP2 CON3 COP3 CONP COPP CIN1 CIP1 CIN2 CIP2 CIN3 CIP3 CINP CIPP VREF TP17 TP18 TP24 TP25 TP26 TP27
Description Ground Positive Supply Voltage Negative Suply Voltage Analog input for Voltage : Analog input for Voltage : Analog input for Voltage : Inputs for current sensor :
Phase 1 Phase 2 Phase 3 Phase 1
Inputs for current sensor : Phase 2 Inputs for current sensor : Phase 3 Connections for crystal or ceramic resonator (OSC1 = Input ; OSC2 = Output) Pulse rate outputs
Connections for outer loop capacitors of A/D converters
Connections for inner loop capacitors of A/D converters
Connection for current setting resistor Manufacturer's test pins (Leave unconnected)
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SA9105E PIN DESCRIPTION (Continued)
Pin PLCC 12 24 34 44 Pin DIP Designation NC NC NC NC Description Not connected
FUNCTIONAL DESCRIPTION The SAMES SA9105E is a CMOS mixed signal Analog/Digital integrated circuit, which performs three phase power/energy calculations over a range of 1000:1, to an overall accuracy of better than Class 1. The integrated circuit includes all the required functions for 3-phase 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 SA9105E generates pulses, the frequency of which is proportional to the power consumption. Three frequency outputs (FOUT1, FOUT2 and FOUT3) are available. The pulse rate follows the instantaneous power measured. 1. Power Calculation In the Application Circuit (Figure 1), the mains voltages from Line 1, Line 2 and Line 3, are converted to currents and applied to the voltage sense inputs IVP1, IVP2 and IVP3. The current levels on the voltage sense inputs are derived from the mains voltage (3 x 230 VAC) being divided down through voltage dividers to 14V. The resulting input currents into the A/D converters are 14A through the resistors R15, R16 and R17. For the current sense inputs the voltage drop across the current transformers terminating resistors are converted to currents of 16A for rated conditions, by means of resistors R8, R9 (Phase 1); R10, R11 (Phase 2) and R 12, R13 (Phase 3). The signals providing the current information are applied to the current sensor inputs IIN1, IIP1; IIN2, IIP2 and IIN3, IIP3. In this configuration, with the mains voltage of 3 x 230 V and rated currents of 80A, the output frequency of the SA9105E energy metering integrated circuit at FOUT1 is 1.16kHz. In this case 1 pulse will correspond to an energy consumption of 3 x 18.4 kW/1160Hz = 47.6 Ws. The output frequency at FOUT2 is FOUT1/4. At FOUT3 the output frequency is FOUT1/290.
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SA9105E 2. Analog Input Configuration 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 processing circuitry
V DD
IIP
CURRENT SENSOR INPUTS
V SS V DD
A
I
IIN
V SS V DD
IVP VOLTAGE SENSOR INPUT
V SS
AV
GND
DR-00524
3.
Electrostatic Discharge (ESD) Protection The SA9105E integrated circuit's inputs/outputs are protected against ESD according to Mil-Std 883 method 3015. The SA9105E integrated circuit's resistance to transients is also dependant upon the external protection components used. Power Consumption The overall power consumption rating of the SA9105E integrated circuit is less than 75mW with a 5V supply. sames
4.
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SA9105E TYPICAL APPLICATION In the Application Circuit (Figure 1), the components required for a three phase power metering application are shown. Terminated current transformers are used for current sensing. The most important external components for the SA9105E integrated circuit are: C7, C9, C10 and C 11 are the outer loop capacitors for the integrated oversampling A/D converters. The typical value of C7 is 2.2nF and the value of C9, C10 and C11 is 560pF. The actual values determine the signal to noise and stability performance. The tolerances should be within 10%. C4, C5, C6 and C8 are the inner loop capacitors for the integrated oversampling A/D converters. The typical value of C4, C5, C 6 and C 8 is 3.3nF. Values smaller than 0.5nF and larger than 5nF should be avoided. Terminated current sensors (current transformers) are connected to the current sensor inputs of the SA9105E through current setting resistors (R8 ..R13). The resistor values should be selected for an input current of 16A into the SA9105E, at the rated line current. The values of these resistors should be calculated as follows: Phase 1: R8 = R 9 = (IL1/16A) * R18/2 Phase 2: R10 = R11 = (IL2/16A) * R 19/2 Phase 3: R12 = R13 = (IL3/16A) * R 20/2 Where I LX = Secondary CT current at rated conditions. R18, R19 and R20 = Current transformer termination resistors for the three phases. R1 + R1A, R4 and R15 set the current for the phase 1 voltage sense input. R2 + R2A , R5 + P 5 and R16 set the current for phase 2 and R3 + R 3A, R6 + P6 and R17 set the current for phase 3. The values should be selected so that the input currents into the voltage sense inputs (virtual ground) are set to 14A for nominal line voltage. Capacitors C1, C2 and C3 are for decoupling and phase compensation. R14 + P14 defines all on-chip bias and reference currents. With R 14+ P14 = 24k, optimum conditions are set. R14 may be varied within 10% for calibration purposes. Any changes to R14 will affect the output quadratically (i.e: R = +5%, f = +10%).
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SA9105E The formula for calculating the Output Frequency (f) is given below: FOSC (II1 IV1) + (II2 I V2) + (II3 IV3) f = 11.16 * FOUTX * 3.58MHz * 3 * IR 2 Where FOUTX = Nominal rated frequency (4Hz, 290Hz or 1160Hz) FOSC II1, I I2, I I3 IR = Oscillator frequency (2MHz ...... 4MHz) = Input currents for current inputs (16A at rated) = Reference current (typically 50A)
IV1, IV2, IV3 = Input currents for voltage inputs (14A at rated) 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. Figure 1: Application Circuit for Three Phase Power/Energy Measurement.
MAINS VOLTAGES
LINE 1 LINE 2 LINE 3 N
R1 R2 R3 R1A R2A R3A C4
0V
C5
1 2 3
40 39 38
5V
C9 R7
FROM CTs
R18
C6 R8 R9 R19
4 5 6 7
37 36 35
C10
VI1P VI1N VI2P VI2N VI3P VI3N 2.5V 2.5V
C7 R20
R10 R11 R12 R13
SA9105A DIP-40 IC-1
R15
34
+ C1 + C2 + C3 R6 R5 R4 R21 C14
R16
33 32 31
8 9 10 11 12 13
2.5V
R17
C11
30 29 28 27 26 25 24 23 22 21
5V C13
P6
P5
C8
14 15 16 17
0V FOUT3 FOUT2 FOUT1 0V 0V 0V
0V
18 19 20
XTAL DR-00233
C12
R14 P14
0V
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SA9105E 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 29 30 31 32 33 34 35 36 37 38 39 40 Symbol IC-1 XTAL R1 R1A R2 R2A R3 R3A R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 P5 P6 P14 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 Description Integrated SA9105E Crystal, 3.5795 MHz Resistor, 200k, 1%, 1/4W Resistor, 180k, 1%, 1/4W Resistor, 200k, 1%, 1/4W Resistor, 200k, 1%, 1/4W Resistor, 200k, 1% , 1/4W Resistor, 180k, 1%, 1/4W Resistor, 24k, 1%, 1/4W Resistor, 22k, 1%, 1/4W Resistor, 22k, 1%, 1/4W Resistor, 820 , 1%, 1/4W Resistor Resistor Resistor Resistor Resistor Resistor Resistor, 22k, 1%, 1/4W Resistor, 1M, 1%, 1/4W Resistor, 1M, 1%, 1/4W Resistor, 1M, 1%, 1/4W Resistor Resistor Resistor Resistor, 820, 1%, 1/4W Potentiometer, 4.7k Potentiometer, 4.7k Potentiometer, 4.7k Capacitor, electrolytic, 1F, 16V Capacitor, electrolytic, 1F, 16V Capacitor, electrolytic, 1F, 16V Capacitor, 3.3nF Capacitor, 3.3nF Capacitor, 3.3nF Capacitor, 2.2nF Capacitor, 3.3nF Capacitor, 560pF Capacitor, 560pF Capacitor, 560pF Detail DIP-40/PLCC-44 Colour burst TV
Note Note Note Note Note Note
1 1 1 1 1 1
Note 1 Note 1 Note 1 Multi Multi Multi Note Note Note turn turn turn 2 2 2
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SA9105E Parts List for Application Circuit: Figure 1 (Continued)
Item 41 42 43 Symbol C12 C13 C14 Description Capacitor, 820nF Capacitor, 100nF Capacitor, 100nF Detail Note 3
Note 1: Resistor (R8, R9, R10, R11, R12 and R13) values are dependant upon the selected values of the current transformer termination resistors R18, R19 and R20. Note 2: Capacitor values may be selected to compensate for phase errors caused by the current transformers. Note 3: Capacitor (C12) to be positioned as close to Supply Pins (VDD & VSS) of IC-1, as possible.
ORDERING INFORMATION Part Number Package SA9105EPA DIP-40 SA9105EFA PLCC-44
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SA9105E Notes:
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SA9105E
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, Koedoespoort Industrial Area, 0039 Pretoria, Republic of South Africa, 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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