sames features n performs power measurement and di- rectly drives a 5 digit (7 segment) led display n accuracy better than 1% ( 1 count) n protected against esd n total power consumption rating below 800mw 1/10 n uses a shunt resistor or for current sensing n operates over a wide temperature range n precision voltage reference on-chip single phase watt measurement module with a 5 digit led display 4358 pds038-sa9106-001 rev. a 06-09-1995 sa9106 application note pm9106ap description the sames single phase watt measurement module, the pm9106ap includes an on- board 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.
pm9106ap 2/10 sames block diagram absolute maximum ratings* parameter symbol min max unit supply voltage (note 1) v ac 540 v current sense input (note 1) v iv -2.5 +2.5 v storage temperature t stg -25 +125 c operating temperature (note2) t o -10 +70 c note 1: voltages are specified with reference to live. note 2: 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. neutral (mains) neutral in neutral out live power supply shunt sa9106a watt meter ic dr-00913 5-digit led display
pm9106ap sames 3/10 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 mw ). the current input stage saturates at input currents greater than18a rms . 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. electrical characteristics (over the temperature range -10c to +70c, unless otherwise specified.) parameter symbol min typ max unit condition supply voltage v ac 180 230 265 v continuous operation power consumption 1 800 mw v ac = 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 description mains voltage supply connection to neutral line voltage supply connection to live line neutral in connection to positive side of current sensor neutral out connection to negative side of current sensor the calculated power is directly displayed on a 5 digit (7 segment) led display. the update interval is approximately every 2 seconds.
pm9106ap 4/10 sames 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: 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. 4. power consumption the overall power consumption rating for this power metering application (figure 2), is under 800mw, excluding the current sensor. 5. circuit description the application circuit (figure 2) shows the components required for the watt measurement module, using a shunt resistor for current sensing. c d . e g f dr-00914 a a h . b
pm9106ap sames 5/10 the most important external components for the sa9106ap device are: c 1 and c 2 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%. c 3 and c 4 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. r 2 , r 1 and r sh 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 w should be avoided. r 1 = r 2 = (i l /16a rms ) * r sh /2 where i l = line current r sh = shunt resistor/termination resistor r 3 , r 5 and r 4 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. r 7 defines all on-chip bias and reference currents. with r 7 = 24k w , 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.
pm9106ap 6/10 sames figure 1: connection diagram dr-00915
pm9106ap sames 7/10 figure 2: application circuit.
pm9106ap 8/10 sames parts list for application circuit: figure 2 item symbol description detail 1 ic-1 sa9106a dip-40 2 ic-2 5v 100ma voltage regulator 3 ic-3 els-511 hwb, common cathode 7 segment read-out 4 ic-4 els-511 hwb, common cathode 7 segment read-out 5 ic-5 els-511 hwb, common cathode 7 segment read-out 6 ic-6 els-511 hwb, common cathode 7 segment read-out 7 ic-7 els-511 hwb, common cathode 7 segment read-out 8 br w04m, bridge rectifier 9 sign red led, 3mm diameter, high bright 10 xtal crystal, 3.5795 mhz colour burst tv 11 r1 resistor, 1% metal note 1 12 r2 resistor, 1% metal note 1 13 r3a resistor, 1% metal note 2 14 r3b resistor, 1% metal note 2 15 r4 resistor, 1m, 1/4w, 1% metal 16 r5 resistor, 24k, 1/4w, 1%, metal 17 r7a resistor, 820 w , 1/4w, 1%, metal 18 r7b resistor, 820 w , 1/4w, 1%, metal 19 r8 resistor, 50 w (segment g) note 3 20 r9 resistor, 50 w (segment f) note 3 21 r10 resistor, 50 w (segment e) note 3 22 r11 resistor, 50 w (segment d) note 3 23 r12 resistor, 50 w (segment c) note 3 24 r13 resistor, 50 w (segment b) note 3 25 r14 resistor, 50 w (segment a) note 3 26 r1 resistor, 50 w ,114w 27 p6 trimpot, 5k multi-turn 28 c1 capacitor,560pf 29 c2 capacitor, 560pf 30 c3 capacitor, 3.3nf 31 c4 capacitor, 3.3nf 32 c6 capacitor, 1000f.16v, electrolytic 33 c7 capacitor, 100nf 34 c8 capacitor, 100nf 35 c9 capacitor, 100nf 36 c15 capacitor, 820nf note 4 37 trans 110v x 2 to 2.7v, 1.5va transformer 38 rsh shunt resistor note 5
pm9106ap sames 9/10 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 (v dd & v ss ) of ic-1 as possible. note 5: see typical applications when selecting the value of rsh. description item symbol pm9106apa PM9106APE detail 115v 230v 13 r3a 120k w 200k w 14 r3b 82k w 180k w ordering information part number description pm9106apa 115v, 80a module PM9106APE 230v, 80a module
pm9106ap 10/10 sames 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: 012 333-6021 tel: int +27 12 333-6021 fax: 012 333-8071 fax: int +27 12 333-8071 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.
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