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FEATURES
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SA9106 APPLICATION NOTE
PM9106AP SINGLE PHASE WATT MEASUREMENT MODULE WITH A 5 DIGIT LED DISPLAY
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Performs power measurement and directly drives a 5 digit (7 segment) LED display Accuracy better than 1% ( 1 count) Protected against ESD Total power consumption rating below 800mW
Uses a shunt resistor or for current sensing Operates over a wide temperature range Precision voltage reference on-chip
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DESCRIPTION The SAMES single phase Watt measurement module, the PM9106AP includes an onboard 5 digit (7 segment) Light Emitting Diode (LED) display. Active power is directly displayed in watts, with a full scale of 20 000 watts. The measured power is updated approximately every 2 seconds, giving an average power reading for this period. This method of calculation takes the power factor into account. This innovative universal Watt measurement module is ideally suited for the display of the measured power in single phase, industrial and domestic power measurement applications. The application utlises the SAMES SA9106AP single phase Watt measurement integrated circuit for power measurement and display. As a safety measure, this application shows the current sensor connected to the neutral line. In practice, the live line may be used for current sensing, provided that the supply connections (MAINS) are reversed on the module.
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4358 PDS038-SA9106-001 REV. A
06-09-1995
PM9106AP BLOCK DIAGRAM
NEUTRAL IN NEUTRAL OUT NEUTRAL (Mains) LIVE
SHUNT POWER SUPPLY
SA9106A 5-DIGIT WATT LED METER DISPLAY IC
DR-00913
ABSOLUTE MAXIMUM RATINGS* Parameter Symbol Supply Voltage (Note 1) VAC Current Sense Input (Note 1) VIV Storage Temperature TSTG Operating Temperature (Note2) TO Note 1: Note 2:
Min -2.5 -25 -10
Max 540 +2.5 +125 +70
Unit V V C C
Voltages are specified with reference to Live. The SA9106AP integrated circuit is specified to operate over the temperature range -10C to +70C. The module functionality will however depend upon the external components used. *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 operational sections of this specification, is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability.
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PM9106AP ELECTRICAL CHARACTERISTICS (Over the temperature range -10C to +70C, unless otherwise specified.) Parameter Symbol Min Typ Max Unit Condition Supply Voltage VAC 180 230 265 V Continuous operation Power Consumption 1 800 mW VAC = 230V Note 1: Power consumption specifications exclude power consumed by the current sensor. Note 2: Isolation voltage may be specified, depending on customer requirements.
PIN DESCRIPTION Designation MAINS NEUTRAL IN NEUTRAL OUT Description Voltage supply connection to Neutral line Voltage supply connection to Live line Connection to positive side of current sensor Connection to negative side of current sensor
FUNCTIONAL DESCRIPTION 1. Power Calculation In the Application Circuit (see Figure 2), the output current from the current sensor will be between 0 and 16A (0 to 80A through a shunt resistor of 625). The current input stage saturates at input currents greater than18ARMS. The mains voltage (230V + 15% -20%) is used to supply the circuitry with power and for the power calculation, together with the current information from the current sensor (shunt resistor). The SA9106AP integrated circuit may be adjusted to accomodate any voltage or current values. The method of calculating external component values is described in paragraph 5 (Circuit Description). SAMES offers two evaluation module options, namely 230V/80A and 115/80A. The calculated power is directly displayed on a 5 digit (7 segment) LED display. The update interval is approximately every 2 seconds.
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PM9106AP 2. LED Display The PM9106AP has an on-board LED display comprising 5 (7 segment) common cathode digits, as well as a sign LED. The sign LED is addressed by DIG [5], the most significant digit by DIG [4] and the least significant digit by DIG [0]. The position of the segments a, b, c, d, e, f and g are given in the diagram below:
a f . e d
DR-00914 The full scale power displayed is 20 000 watts. An overflow is indicated by a flashing display. 3. Electrostatic Discharge (ESD) Protection The device's inputs/outputs are protected against ESD according to Mil-Std 883C, method 3015. The modules resistance to transients will be dependant upon the protection components used. Power Consumption The overall power consumption rating for this power metering application (Figure 2), is under 800mW, excluding the current sensor. Circuit Description The Application Circuit (Figure 2) shows the components required for the Watt measurement module, using a shunt resistor for current sensing.
b g c h .
4.
5.
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PM9106AP The most important external components for the SA9106AP device 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 optimum 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 RMS into the SA9106AP at rated line current. Values for RSH of less than 200 should be avoided. R1 = R 2 = (I L/16ARMS) * R SH/2 Where IL = RSH = Line current Shunt resistor/termination resistor
R3, R5 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. XTAL is a colour burst TV crystal (f = 3.5795MHz) for the oscillator. The oscillator frequency is divided down to 1.7897MHz on-chip and supplies the A/D converters and the digital circuitry.
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PM9106AP Figure 1: Connection Diagram
DR-00915
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PM9106AP Figure 2: Application Circuit.
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PM9106AP 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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Symbol IC-1 IC-2 IC-3 IC-4 IC-5 IC-6 IC-7 BR SIGN XTAL R1 R2 R3A R3B R4 R5 R7A R7B R8 R9 R10 R11 R12 R13 R14 R1 P6 C1 C2 C3 C4 C6 C7 C8 C9 C15 TRANS RSH Description SA9106A 5V 100mA Voltage Regulator ELS-511 HWB, Common cathode 7 segment read-out ELS-511 HWB, Common cathode 7 segment read-out ELS-511 HWB, Common cathode 7 segment read-out ELS-511 HWB, Common cathode 7 segment read-out ELS-511 HWB, Common cathode 7 segment read-out W04M, Bridge Rectifier Red LED, 3mm diameter, high bright Crystal, 3.5795 MHz Resistor, 1% metal Resistor, 1% metal Resistor, 1% metal Resistor, 1% metal Resistor, 1M, 1/4W, 1% metal Resistor, 24k, 1/4W, 1%, metal Resistor, 820 , 1/4W, 1%, metal Resistor, 820 , 1/4W, 1%, metal Resistor, 50 (Segment G) Resistor, 50 (Segment F) Resistor, 50 (Segment E) Resistor, 50 (Segment D) Resistor, 50 (Segment C) Resistor, 50 (Segment B) Resistor, 50 (Segment A) Resistor, 50,114W Trimpot, 5k Capacitor,560pF Capacitor, 560pF Capacitor, 3.3nF Capacitor, 3.3nF Capacitor, 1000F.16V, Electrolytic Capacitor, 100nF Capacitor, 100nF Capacitor, 100nF Capacitor, 820nF 110V x 2 to 2.7V, 1.5VA Transformer Shunt Resistor Detail DIP-40
Colour burst TV Note 1 Note 1 Note 2 Note 2
Note 3 Note 3 Note 3 Note 3 Note 3 Note 3 Note 3 Multi-turn
Note 4 Note 5
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PM9106AP Note 1: Resistor (R1 and R2) values are dependant upon the selected value of RSH. Note 2: See the table below, detailing the component values for the selected voltage standard. Note 3: Resistors (R8 to R14) are current limiting resistors required to set the intensity of the LED display segments. Note 4: Capacitor (C5) to be positioned as close to Supply Pins (VDD & VSS) of IC-1 as possible. Note 5: See TYPICAL APPLICATIONS when selecting the value of RSH. Description PM9106APA 115V 120k 82k
Item 13 14
Symbol R3A R3B
PM9106APE 230V 200k 180k
Detail
ORDERING INFORMATION Part Number Description PM9106APA 115V, 80A Module PM9106APE 230V, 80A Module
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PM9106AP
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:
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012 333-6021 012 333-8071 sames
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