SA2005

SA2005F SAMES | Alldatasheet

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Technical content

FEATURES

n Functionally compatible with the SA9105F with reduced external components n Performs bidirectional one, two or three phase power and energy measurement n Meets the IEC 521/1036 Specification requirements for Class 1 AC Watt hour meters samessames Three Phase Bidirectional Power/Energy Metering IC with Instantaneous Pulse Output SA2005F 1/10SPEC-0042 (REV. 1) 03-07-00 n Operates over a wide temperature range n Uses current transformers for current sensing n Easily adaptable to different signal levels n Precision voltage reference on chip n Precision oscillator on chip. n Protected against ESD

DESCRIPTION

The SAMES SA2005F is an enhancement of the SA9105F. A precision oscillator and the loop capacitors are integrated on chip. The SAMES SA2005F three phase bidirectional power/energy metering integrated circuit generates pulse rate outputs for positive and negative energy directions. The frequency of the pulses is proportional to the measured power consumption. The SA2005F performs active power calculation. The method of calculation takes the power factor into account. Energy consumption is determined by integrating the power measurement over time. This innovate universal three phase power/energy metering integrated circuit is ideally suited for applications such as residential and industrial energy metering and control. The SA2005F integrated circuit is available in 20 pin dual-in- line plastic (DIP-20), and 20 pin small outline (SOIC-20) package types. Figure 1: Block Diagram POWER TO PULSE RATE REF OSCTIMING & CONTROL INTEGRATE AND AVERAGE DIR TCLKTEST FOUT PGM0 PGM1VDD VSS IVN1 X IIN1 IIP1 VREF GND Dr-01570 IVN2 X IIN2 IIP2 IVN3 X IIN3 IIP3

2/103http://www.sames.co.za ELECTRICAL CHARACTERISTICS # (V = 2.5V, V = -2.5V, over the temperature range -10°C to +70°C, unless otherwise specified.)DD SS ABSOLUTE MAXIMUM RATINGS* Supply Voltage V -V -0.3 6.0 VDD SS Current on any pin I -150 +150 mAPIN Storage Temperature T -40 +125 °CSTG Operating Temperature T -40 +85 °CO *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. Parameter Symbol Min Max Unit Operating temp. Range Supply Voltage Supply Current Nonlinearity of Power Calculation Current Sensor Inputs (Diffferential) Input Current Range Voltage Sensor Input (Asymmetrical) Input Current Range Pins FOUT, DIR Output Low Voltage Output High Voltage Pulse Rate: FOUT Pin PGM0, PGM1, TEST, TCLK High Voltage Low Voltage Pin VREF Ref. Current Ref. Voltage V µA µA V V Hz Hz Hz Hz V V µA V TO V - VDD SS IDD III IIV VOL VOH fP fP VIH VIL -IR VR -25 -25 -25 4.5 -0.3 V- 1DD V- 1DD 1.1 50 55 1.3 V+ 1SS 1160 3500 200 V+ 1SS +25 +25 +85 5.5 +0.3 1% - 100% of rated power Peak value Peak value I = 5mAOL I = -2mAOH MODES 0, 1, 2 Specified linearity Min and Max limits MODE 3 Specified linearity Min and Max Limits With R = 24kW connected to VSS Referred to VSS mA Output unloaded ConditionUnitMaxTypMinSymbolParameter

http://www.sames.co.za Figure 2: Pin connections: Package: DIP-20, SOIC-20 DR-01571 1IIP2 IVN2 GND IIN2 IIN1 VREF IVN3 IIP1 VSS IIP3 IIN3 VDD TEST FOUT IVN1 PGM1 PGM0 NCTCLK DIR 6 15 1110

20 Part Number

ORDERING INFORMATION

Analog Ground. The voltage to this pin should be mid-way between V and V .DD SS Positive Supply voltage. Negative Supply voltage. The current into the A/D converter should be set at 14µA at nominal mains RMS voltage. The voltage sense input saturates at an input current of ±25µA peak. Inputs from current sensors. The shunt resistor voltage from each channel is converted to a current of 16µA at rated conditions. The current sense input RMS saturates at an input current of ±25µA peak. This pin provides the connection for the reference current setting resistor. A 24kW resistor connected to V sets the optimum operating condition.SS Test inputs. For normal operation these pins must be connected to V .SS Pulse rate output. The pulse frequency is proportional to the sum of the power measured on all three phases. The pulse format also indicates the direction of energy flow. Direction output. This output indicates the direction of energy flow. FOUT Pulse format Select. These inputs define the FOUT pulse width and format. GND VDD VSS IVN1, IVN2, IVN3 IIN1, IIP1, IIN2, IIP2, IIN3, IIP3 VREF TCLK, TEST FOUT DIR PGM0, PGM1 Designation DescriptionPIN 17, 20, 3 19, 18, 2, 1, 5, 4 7, 10 12, 13

Figure 3: Analog Input Internal Configuration http://www.sames.co.za FUNCTIONAL DESCRIPTION The SAMES SA2005F is a CMOS mixed signal 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 SA2005F is functionally similar to the SA9105F . No external loop capacitors are required and an precision oscillator is integrated on chip. 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 SA2005F generates pulses with a frequency proportional to the power measured. The pulse rate follows the instantaneous power measured. The pulse frequency is proportional to the total sum of the three phases. POWER CALCULATION In the application circuit (figure 5), the mains voltages from V1, V2 and V3, 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 voltages (3 x 230VAC) being divided down to 14V through voltage dividers. The resulting input currents into the A/D converters are 14µA through the resistors R8, R9 and RMS R10. For the current sense inputs the voltage drop across the current transformers terminating resistors are converted to currents of 16µA at rated conditions, by means of resistors RMS R1, R2 (Phase 1); R3, R4 (Phase 2) and R5, R6 (Phase 3). The signals providing the current information are applied to the current sensor inputs IIN1, IIP1, IIN2, IIP2 and IIN3, IIP3. The output frequency of the SA2005F energy metering integrated circuit at rated conditions is 64Hz on FOUT (PGM0=0, PGM1=1). One pulse (measured in Watt second) correspond to an energy measured of 3 x I x V / 64Hz.RATED RATED For a more detailed description see the Input Signals section. INPUT SIGNALS Analog Input Configuration The current and voltage sensor inputs are illustrated in figure 3. 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 A and A generate virtual shorts on the signal inputs. I V Exact duplications of the input currents are generated for the analog processing circuitry. Voltage Reference Connection (VREF) A bias resistor of 24k provides an optimum bias conditions on chip. Calibration of the SA2005F should be done on the voltage inputs of the device as described in Typical Applications. Current Sense Inputs (IIN1, IIP1, IIN2, IIP2, IIN3, IIP3) At rated current the resistor values should be selected for input currents of 16µA . Referring to figure 5, the resistors R1 and RMS R2 on current channel 1, resistors R3 and R4 on current channel 2 and resistors R5 and R6 on current channel 3, define the current level into the current sense inputs of the SA2005F. The current sense inputs saturates at an input current of ±25µA peak. Resistors R25, R26 and R27 are the current transformer termination resistors. The voltage drop across the termination resistors should be at least 20mV at rated conditions. Values for the current sense inputs are calculated as follows: R = R = (I / 16µA ) x R / 21 2 L RMS 25 R = R = (I / 16µA ) x R / 2 3 4 L RMS 26 R = R = (I / 16µA ) x R / 25 6 L RMS 27 Where: I = Line current/CT-ratioL VOLTAGE SENSOR INPUT IVP DR-01288 SSV CURRENT SENSOR INPUTS IIP IIN SSV VDD SSV VDD DDV GND A V AI

http://www.sames.co.za Voltage Sense Inputs (IVN1, IVN2, IVN3) The current into the voltage sense inputs (virtual ground) should be set to 14µA at rated voltage conditions. The RMS individual mains voltages are divided down to 14V per RMS phase. The resistors R8, R9 and R10 set the current for the voltage sense inputs. The voltage sense inputs saturate at an input current of ±25µA peak. Pulse Programming Inputs (PGM0, PGM1) The pulse programming inputs PGM1 and PGM0 define the representation of energy measured by the device on FOUT. The table below shows the difference between the various modes. DIR as a logic 1. The DIR pin may be used to drive a LED in order to indicate reverse energy flow. Frequency Output (FOUT) The sum of the measured power, from the three phases produce a pulse rate of 64Hz or 1160Hz (mode 3), at rated conditions on FOUT. The format of the pulse output signal, which provides power/energy and direction information is shown in figure 4. Refer to Pulse Programming Inputs for pulse widths. The following equation may be used for calculating the output frequency: f = 11.16 x FOUTX x ((I x I )+(I x I )+(I x I )) / 3 x II1 V1 I2 V2 I3 V3 R Where: FOUTX = Nominal rated frequency (64Hz/1160Hz) I , I , I = Input currents for current sensor inputs (16µA at rated I1 I2 I3 line current) I , I , I = Input currents for voltage sensor inputs (14µA at V1 V2 V3 rated line voltage) I = Reference current (typically 50µA)R An integrated anti-creep function ensures that no pulses are generated at zero line currents. ELECTROSTATIC DISCHARGE (ESD) PROTECTION The SA2005F integrated circuit's inputs/outputs are protected against ESD. POWER CONSUMPTION The overall power consumption rating of the SA2005F integrated circuit is less than 50 mW with a 5V supply. Figure 4: FOUT options Note: Frequency of pulse rate in MODE 3 is 18 times higher than other modes Mode PGM1 PGM0 Frequency at rated conditions Forward Pulse Width Reverse Pulse Width 64Hz 64Hz 64Hz 1160Hz 1.14ms 1.14ms 1.14ms 71µs 3.4ms 1.14ms 1.14ms 71µs Test Inputs (TCLK, TEST) The TEST and TCLK inputs are manufacturers test pins and must be connected to VSS in a metering application. OUTPUT SIGNALS Direction Indication (DIRO) The SA2005F indicates the measured energy flow direction on pin DIR. A logic 0 on pin DIR 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 MODE 0 FOUT MODE1 FOUT MODE2 FOUT MODE3 FOUT DIR DR-01582

6/10http://www.sames.co.za TYPICAL APPLICATION In figure 5, the components required for the three phase power/energy metering section of a meter, is shown. The application uses current transformers for current sensing. The 4-wire meter section is capable of measuring 3x230V/80A with precision better than Class 1. The most important external components for the SA2005F integrated circuit are the current sense resistors, the voltage sense resistors as well as the bias setting resistor. BIAS RESISTOR R7 defines all on-chip and reference currents. With R7=24kW, optimum conditions are set. Device calibration is done on the voltage inputs of the device. CT TERMINATION RESISTOR The voltage drop across the CT termination resistor at rated current should be at least 20mV. The CT’ s used have low phase shift and a ratio of 1:2500.The CT is terminated with a 2.7W resistor giving a voltage drop across the termination resistor 864mV at rated conditions (Imax for the meter). CURRENT SENSE RESISTORS The resistors R1 and R2 define the current level into the current sense inputs of phase one of the device. The resistor values are selected for an input current of 16µA on the current inputs at rated conditions. According to equation described in the Current Sense inputs section: R1 = R2 = (I / 16µA ) x R / 2LS H = 80A /2500 / 16µA x 2.7W / 2 = 2.7kW I = Line current / CT RatioL The three current channels are identical so R1 = R2 = R3 = R4 = R5 = R6. VOLTAGE DIVIDER The voltage divider is calculated for a voltage drop of 14V. Equations for the voltage divider in figure 5 are: RA = R16 + R19 + R22 RB = R8 || (R13+P1) Combining the two equations gives: ( RA + RB ) / 230V = RB / 14V A 5k trimpot is used in each of voltage channel for meter calibration. The center position of the pot is used in the calculations. P1 = 2.5k and values for resistors R13 = 22k and R8 =1M is chosen. Substituting the values result in: RB = 23.9k RA = RB x (230V / 14V - 1) RA = 368.9k. Resistor values of R16, R19 and R22 is chosen to be 120k, 120k and 130k. The three voltage channels are identical so R14= R15= R16 = R17 = R18 = R19 and R20 = R21= R22.

7/10http://www.sames.co.za Figure 5: Application Circuit R11 IIP1 IIN119 IIP2 IIN2 IIP3 IIN3 VREF15 VSS14 IVN1 17 IVN2 20 IVN3 GND 16 VDD PGM1 13 PGM0 12 FOUT DIR TCLK TEST SA2002F Dr-01572 R10 R12 R13 VDD V1In V2 In V3 In VSS R14 R15 R16 R17 R18 R19 R20 R21 R22 R25 CT1 CT2 CT3 R26 R27 D1 R28 D2 R29 VSS VSS VDD GND GND GND GND GNDV3 Out V2 Out V1 Out R23 R24 VDD VSS NEUTRAL GND

http://www.sames.co.za Symbol Description Detail SA2005F Resistor, 2.7k, 1/4W, 1% metal Resistor, 2.7k, 1/4W, 1% metal Resistor, 2.7k, 1/4W, 1% metal Resistor, 2.7k, 1/4W, 1% metal Resistor, 2.7k, 1/4W, 1% metal Resistor, 2.7k, 1/4W, 1% metal Resistor, 24k, 1/4W, 1%, metal Resistor, 1M, 1/4W, 1%, metal Resistor, 1M, 1/4W, 1%, metal Resistor, 1M, 1/4W, 1%, metal Resistor, 22k, 1/4W, 1%, metal Resistor, 22k, 1/4W, 1%, metal Resistor, 22k, 1/4W, 1%, metal Resistor, 120k, 1/4W, 1%, metal Resistor, 120k, 1/4W, 1%, metal Resistor, 120k, 1/4W, 1%, metal Resistor, 120k, 1/4W, 1%, metal Resistor, 120k, 1/4W, 1%, metal Resistor, 130k, 1/4W, 1%, metal Resistor, 130k, 1/4W, 1%, metal Resistor, 130k, 1/4W, 1%, metal Resistor, 1k, 1/4W, 1%, metal Resistor, 1k, 1/4W, 1%, metal Resistor, 2.7R, 1/4W, 1%, metal Resistor, 2.7R, 1/4W, 1%, metal Resistor, 2.7R, 1/4W, 1%, metal Trim pot, 5k, Multi turn Trim pot, 5k, Multi turn DIP-20/SOIC-20 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 Resistor, 120k, 1/4W, 1%, metal Trim pot, 5k, Multi turn Capacitor, 220nF Capacitor, 220nF Capacitor, 820nF Capacitor, 820nF Capacitor, 820nF Capacitor, 820nF 3mm Light emitting diode 3mm Light emitting diode Current Transformer, TZ76 LED1 LED2 CT1 Current Transformer, TZ76 Current Transformer, TZ76 CT2 CT3 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 2 Note 2 Note 2 Note 3 Note 1: Resistor (R1 to R6) values are dependant on the selection of the termination resistors (R25 to R27) and CT combination. Note 2: Capacitor values may be selected to compensate for phase errors caused by the current transformers. Note 3: Capacitor C6 to be positioned as close as possible to supply pins V and V of U1 as possible.DD SS Parts List for Application Circuit: Figure 5

9/10http://www.sames.co.za NOTES:

samessamesPM9607AP samessamesSA2005F 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 DIVISION OF LABAT TECHNOLOGIES (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

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