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features bi-directional active and reactive power/energy measurement rms voltage and frequency measurement individual phase information spi communication bus meets the iec 61036 specification requirements for class 1 ac watt hour meters sames three phase power / energy ic with spi interface SA9904B 1/12 meets the iec 61268 specification requirements for class 2 var hour meters protected against esd total power consumption rating below 60mw uses current transformers for current sensing operates over a wide temperature range precision on-chip voltage reference description the sames SA9904B is a three phase bi-directional energy/power metering integrated circuit that measured values for active and reactive energy, the mains voltage and frequency for each phase are accessible through the spi interface from 24 bit registers. the SA9904B active and reactive energy registers are capable of holding at least 52 seconds of accumulated energy at full load. a has been designed to measure active and reactive energy, rms mains voltage and frequency. the SA9904B has an integrated spi serial interface for communication with a micro-controller. mains voltage zero crossover is available on the f50 output. the SA9904B includes all the required functions for three- phase power and energy measurement such as oversampling a/d converters for the voltage and current sense inputs, power calculation and energy integration. this innovative universal three phase power/energy metering integrated circuit is ideally suited for energy calculations in applications such as electricity dispensing systems, residential metering and factory energy metering and control. the SA9904B integrated circuit is available in 20 pin dual-in- line plastic (pdip20), as well as 20 pin small outline (soic20) package types. figure 1: block diagram spec-0447 (rev. 5) 05-02-03 ivp1 spi voltage ref. di vss vdd do f50 vref osc2 osc1 gnd active reactive rms voltage mains freq. current adc voltage adc sck cs osc iip1 iip2 ivp2 ivp3 iin2 iin2 iin3 iip3 dr-01641
sames SA9904B 2/12 3 http://www.sames.co.za electrical characteristics ( v = 2.5v, v = -2.5v, over the temperature range -10c to +70c , unless otherwise specified.) dd ss # absolute maximum ratings* supply voltage v -v 3.6v 6.0 v current on any pin i -150 +150 ma storage temperature t -40 +125 c operating temperature t -40 +85 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. dd ss pin stg o parameter min max unit symbol c v a a t o v dd i ii i iv -25 -25 -25 2.25 +25 +25 +85 2.75 peak value peak value i = 5ma i = -2ma ol oh condition unit max typ min symbol parameter v v ss -2.75 -2.25 i dd 11 9.5 ma i ss 11 9.5 ma v v v v f t t ih il sck lo hi v-1 dd v+1 ss khz s s 0.6 0.6 800 v v v v ih il v-1 dd v+1 ss v v v-1 dd v+1 ss v v ol oh recommended crystal: tv colour burst crysta l f = 3.5795 mhz with r = 47k connected to v reference to ss v ss a v 23 1.1 27 1.3 -i v r r 25 operating temp. range supply voltage: positive supply current: positive supply current: negative supply voltage: negative current sensor inputs (differential) voltage sensor input (asymmetrical) input current range input current range pins sck high voltage low voltage pins cs, di high voltage low voltage pins f50, do low voltage high voltage oscillator pin vref ref. current ref. voltage during manufacturing, testing and shipment we take great care to protect our products against potential external environmental damage such as electrostatic discharge (esd). although our products have esd protection circuitry, permanent damage may occur on products subjected to high-energy electrostatic discharges accumulated on the human body and test equipment and can discharge without detection. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality during product handling.
3/12 sames SA9904B http://www.sames.co.za figure 2: pin connections: package: pdip20, soic20 part number SA9904Bpa SA9904Bsa package pdip20 soic20 ordering information pin description analog ground. the supply voltage to this pin should be mid-way between v and v . dd ss positive supply voltage. the voltage to this pin is typically +2.5v if a shunt resistor is used for current sensing or in the case of a current transformer a +5v supply can be applied. gnd v dd designation description pin 16 6 negative supply voltage. the voltage to this pin is typically -2.5v if a shunt resistor is used for current sensing or in the case of a current transformer a 0v supply can be applied. v ss 14 analog input for voltage phase 1, phase 2 and phase 3. the current into the a/d converter should be set at 14a at nominal mains voltage. the voltage sense input saturates at an input current of 25a peak. rms 17, 20, 3 ivp1, ivp2, ivp3 inputs for current sensors. the shunt resistor voltage from each channel is converted to a current of 16a at rated conditions. the current sense input saturates at an input current of 25a peak. rms 18, 19, 1, 2, 4, 5 iip1, iin1, iip2, iin2, iip3, iin3 this pin provides the connection for the reference current setting resistor. a 47k resistor connected to sets the optimum operating condition. 15 vref connections for a crystal or ceramic resonator. (osc1 = input; osc2 = output) 10, 11 osc1, osc2 serial clock in. this pin is used to strobe data in and out of the SA9904B 8 sck serial data out. data from the SA9904B is strobed out on this pin. do is only driven when cs is active. 9 do voltage zero crossover. the f50 output generates a pulse, on every rising edge of the mains voltage for any one phase. 7 f50 serial data in. data is only accepted during an active chip select (cs). 12 di chip select. the cs pin is active high. 13 cs 1 iip2 ivp2 iin2 iin1 vref iip1 vss ivp3 iip3 iin3 vdd f50 sck ivp1 gnd cs di do osc1 osc2 2 3 4 5 615 14 13 12 11 10 9 8 7 16 17 18 19 20 dr-01642
4/12 sames SA9904B http://www.sames.co.za functional description the SA9904B is a cmos mixed signal analog/digital integrated circuit, which performs the measurement of active power, reactive power, rms voltage and mains frequency. the integrated circuit includes all the required functions for three- phase power and energy measurement such as oversampling a/d converters for the voltage and current sense inputs, power calculation and energy integration. and 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 levels into the SA9904B current sense inputs. the current sense inputs saturates at 25a peak. resistors rsh1, rsh2 and rsh3 are the current transformer termination resistors. the voltage drop across the termination resistors should be at least 20mv but not higher than 200mv. the ideal value should be approximately 100mv at rated conditions. values for the current sense inputs are calculated as follows: r =r =( / )xrsh/2 12 i 16a r = r = (i / 16a ) x rsh / 2 r = r = (i / 16a ) x rsh / 2 l rms 3 4 l rms 5 6 l rms figure 3: typical architecture of an energy meter using the SA9904B the SA9904B integrates instantaneous active and reactive power into 24 bit registers. rms voltage and frequency are continuously measured and stored in the respective registers. the mains voltage zero crossover is available on the f50 output. the spi interface of the SA9904B has a tri-state output that allows connection of more than one metering device on a single spi bus. the input circuitry of the current and voltage sensor inputs is illustrated in figure 4. these inputs are protected against electrostatic discharge through clamping diodes. the feedback loops from the outputs of the amplifiers a and a generate virtual shorts on the signal inputs. exact duplications of the input currents are generated for the analog signal processing circuitry. the current and voltage sense inputs are identical. both inputs are differential current driven up to 25a peak. one of the voltage sense amplifier input terminals is internally connected to gnd. this is possible because the voltage sense input is much less sensitive to externally induced parasitic signals compared to the current sense inputs. at rated current (i ) the resistor values should be selected for input currents of 16a . referring to figure 5, the resistors r1 input signals analog input configuration current sense inputs (iin1, iip1, iin2, iip2, iin3, iip3) iv rms max figure 4: analog input internal configuration voltage sensor input ivp dr-01288 ss v current sensor inputs iip iin ss v v dd ss v v dd dd v gnd a v a i figure 5: current sense input configuration current sensing voltage sensing power supply SA9904B active energy reactive energy v and frequency measurements rms calibration led micro- controller lcd eeprom spi nl1l2l3 a micro-controller in addition to communicating with the SA9904B is used to read/write parameters to the eeprom, output pulses for fast calibration and to display the consumed active and reactive power, vrms and mains frequency information. other parameters such as irms, phase angle etc. can be accurately calculated. dr-01643 r1 r2 r3 r4 r5 r6 ch1in ch2 in ch3 in rsh1 ct1 ct2 ct3 rsh2 rsh3 gnd gnd gnd ch3 out ch2 out ch1 out iip1 iin1 iip2 iin2 iip3 iin3 neutral gnd SA9904B i max i max i max 16a rms 16a rms 16a rms > 20mv rms > 20mv rms > 20mv rms dr-01644
5/12 sames SA9904B http://www.sames.co.za where: i = line current or if a ct is used = line current / ct ratio rsh = shunt resistor or ct termination resistor. rsh should be less than the resistance of the ct's secondary winding. figure 6 shows the voltage sense (ivp) input configuration for one phase. the exact circuit is duplicated for the other two phases. the current into the voltage sense inputs (virtual ground) should be set to at rated voltage conditions. l i 14a the voltage sense inputs saturate at an input current of 25a peak. l rms voltage sense input (ivp1, ivp2, ivp3) the micro controller and the SA9904B. the clock signal on this pin is generated by the micro controller and determines the data transfer rate of the do and di pins. the di pin is the serial data input pin for the SA9904B. data will be input at a rate determined by the serial clock (sck). data will be accepted only during an active chip select (cs). the cs input is used to address the SA9904B. an active high on this pin enables the SA9904B to initiate data exchange. serial data in (di) chip select (cs) output signals serial data out (do) mains voltage sense zero crossover (f50) the do pin is the serial data output pin for the SA9904B. the serial clock (sck) determines the data output rate. data is only transferred during on active chip select (cs). this output is tri-state when cs is low. the f50 output generates a signal, which follows the mains voltage zero crossings, see figure 7. the micro controller can use the f50 to extract mains timing. this output generates a pulse on the rising edge of the mains voltage zero crossing point. internal logic ensures that this signal is generated from a valid phase. should all three phase be missing but power still applied to the SA9904B this output will generate a constant 54hz signal. figure 7: mains voltage zero crossover figure 6: voltage sense input configuration the individual mains voltages are divided down to per phase. the resistor r8 sets the current for the voltage sense input. the voltage divider is calculated for a voltage drop of 14v. with a phase voltage of 230v the equation for the voltage divider is: ra = r16 + r19 + r22 rb = r8 || r13 combining the two equations gives: (ra + rb) / 230v = rb / 14v a 24k resistor is chosen for r13 and a 1m resistor for r8. substituting these values results in: rb = 23.44k ra = rb x (230v / 14v-1) ra = 361.6k resistor values for r16, r19 and r22 is chosen to be 120k each. the capacitor c5 is used to compensate for any phase shift caused by the current transformer. as an example to compensate for a phase shift of 0.18 degrees the capacitor value is calculated as follows: the vref pin is the reference for the bias resistor. with a bias resistor of 47k connected to vss optimum conditions are set. the sck pin is used to synchronize data interchange between 14v rms between the voltage sense and current sense input c = 1 / (2 x x mains frequency x r5 x tan (phase shift angle)) c = 1 / (2 x x 50hz x 1m x tan (0.18 degrees)) c = 1.013f reference voltage (vref) serial clock (sck) r8 r13 ch1 voltage c5 r16 r19 r22 ivp1 neutral gnd gnd 14a rms 14v rms dr-01645 spi - interface description a serial peripheral interface bus (spi) is a synchronous bus used for data transfers between a micro controller and the SA9904B. the pins do (serial data out), di (serial data in), cs (chip select), and sck (serial clock) are used in the bus implementation. the SA9904B is the slave device with the micro controller being bus master. the cs input initiates and terminates data transfers. a sck signal (generated by the micro controller) strobes data between the micro-controller f50 1ms to 2ms +5v 0v (vss) phase voltage dr-01646 1ms to 2ms
sames SA9904B 6/12 http://www.sames.co.za figure 8: spi waveforms and the sck pin of the SA9904B. the di and do pins are the serial data input and output pins for the SA9904B, respectively. table 1 lists the various register addresses. the SA9904B contains nine 24 bit- registers representing the active energy, reactive energy and the mains voltage for each phase. a tenth 24 bit register represents the mains frequency for any valid phase. to remain compatible with the sa9604a three addresses have been included. any of the three addresses can be used to access the frequency register. register access id 1 2 3 4 5 6 7 8 9 10 11 12 register active phase 1 reactive phase 1 voltage phase 1 frequency active phase 2 reactive phase 2 voltage phase 2 frequency active phase 3 reactive phase 3 voltage phase 3 frequency 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 a5 x x x x x x x x x x x x a4 x x x x x x x x x x x x a3 0 0 0 0 0 0 0 0 1 1 1 1 a2 0 0 0 0 1 1 1 1 0 0 0 0 a1 0 0 1 1 0 0 1 1 0 0 1 1 a0 0 1 0 1 0 1 0 1 0 1 0 1 header bits the 9 bits needed for register addressing can be padded with leading zeros when the micro-controller requires a 8 bit spi word length. the following sequence is valid: figure 8 shows the spi waveforms and figure 9 the timing information. after the least significant digit of the address has been entered on the rising edge of sck, the output do goes low with the falling edge of sck. each subsequent falling edge transition on the sck pin will validate the next data bit on the do pin. the content of each register consists of 24 bits of data. the msb is shifted out first. data format 10 11 12 13 14 15 9876543210 0000000110a5a4a3 a2 a1 a0 1 1 a5 a0 a1 a2 a3 a4 0 d23 d22 d21 d1 d0 d23 d22 d1 d0 do di sck cs read command register address register data next data register high impedance 0 dr-01647 the header bits 110 (0x06) must precede the 6-bit address of the register being accessed. when cs is high, data on pin di is clocked into the SA9904B on the rising edge of sck. figure 8 shows the data clocked into di comprising of 110a5a4a3a2 a1 a0. address locations a5 and a4 are included for compatibility with future developments. registers may be read individually and in any order. after a register has been read, the contents of the next register value will be shifted out on the do pin with every sck clock cycle. data output on do will continue until cs is inactive. t1 t5 t3 sck di do cs dr-01545 t4 t2 parameter t1 t3 t4 t2 t5 max 1.160s min 625ns 625ns 625ns 20ns 625ns description sck rising edge to do valid sck min high time sck min low time setup time for di and cs before the rising edge of sck di hold time figure 9: spi timing diagrams with timing information table 1: register address
sames SA9904B 7/12 http://www.sames.co.za figure 10: register increment / decrement showing the register wrap around register values positive energy flow negative energy flow register wrap around register wrap around h7fffff (8388607) h800000 (8388608) hffffff (16777215) 0 ................ ................ dr-01590 using this delta value will result in incorrect calculations. the rms voltage measurement is accurate to 1% for a range of 50% to 115% of the rated mains voltage. voltage registers the three voltage registers contain the rms voltage measured for each phase. frequency register the single frequency register contains the measured mains frequency information for a valid phase. internal logic ensures that the frequency information is generated from the same phase being used for the f50 output. only bits d0 to d9 are used for the frequency calculation however the remaining bits must still be clocked out as additional information can be derived from these data bits. register description active and reactive registers the active and reactive power is accumulated in 24 bit registers for each phase. these registers are 24 bit up/down counters, that increment or decrement at a rate of 320k samples per second at rated conditions. active or reactive energy register 2322212019 109876543210 the register values will increment for positive energy flow and decrement for negative energy flow as indicated in figure 10. the active and reactive registers are not reset after access, so in order to determine the correct register value, the previous value read must be subtracted from the current reading. the data read from the registers represents the active or reactive power integrated over time. the increase or decrease between readings represent the measured energy consumption. at rated conditions, the active and reactive registers will wrap around every 52 seconds. the micro controller program needs to take this condition into account when calculating the difference between register values. as an example lets assume that with a constant load connected, the delta value (delta value = present register - previous register value) is 22260. because of the constant load, the delta value should always be 22260 every time the register is read and the previous value subtracted (assuming the same time period between reads). however this will not be true when a wrap around occurs, as the following example will demonstrate: voltage register 2322212019 109876543210 frequency register 23 22 21 20 19 10 11 12 13 14 15 16 17 18 9876543210 mains frequency not used missing phase phase sequence error voltage zero crossover bit location description 0to9 10 to 17 18,19,20 these bits represent a value that is used in the frequency calculation not used missing phase. these bits indicate which phase is missing during a lost phase condition. d18 1 d19 x d20 x missing phase phase 1 x 1 x phase 2 x x 1 phase 3 21,22 the phase error status can be ascertained from these two bits. d21 0 d22 0 missing phase no phase error 0 1 phase sequence error. 1 x missing phase 23 voltage zero crossover. this bit changes state with the rising edge of the mains voltage. present register value previous register value new_val - old_val = present register value previous register value new_val - old_val = new_val old_val delta_val new_val old_val delta_val 16767215 16744955 22260 12259 16767215 -16754956 0x00ffd8ef 0x00ff81fb 0x000056f4 0x00002fe4 0x00ffd8ef 0x00ffa90b decimal hex description variable the register now wraps around so after the next read the values are as follows:
sames SA9904B 8/12 http://www.sames.co.za power calculation instantaneous power signals are generated by multiplying the current and voltage signals, for active power =vxix cos(?) and for reactive power = v x i x sin(?). the power signals are continuously added to the respective energy registers. positive power will be added to the energy register contents and negative energy will be subtracted. (in watt seconds or var seconds) = rated mains voltage of meter (in watt or var) using the register values active and reactive energy register the active and reactive energy measured per count can be calculated by applying the following formulae: energy per count = ( where: = rated mains current of meter v x i )/ 320000 v i vi = rated rated rated rated rated rated the active and reactive power measured by the SA9904B is calculated as follows: power = x x n / int / 320000 where: v = rated mains voltage of meter i rated mains current of meter n = difference in register values between successive reads (delta value) int = time difference between successive register reads (in seconds) time rated rated time mains voltage register mains frequency register the rms voltage measurement is accurate to 1% in a range of 50% to 115% of rated mains voltage. the rms mains voltage measured by the SA9904B is calculated as follows: voltage = x / 700 where = rated mains voltage of meter v voltage register value the mains frequency measured by the SA9904B is calculated as follows: frequency = f / 256 / f where f the external crystal frequency. f = bits d9 to d0 of the frequency register. vv v = = rated register value rated register value crystal register value crystal register value
sames SA9904B 9/12 http://www.sames.co.za typical application in figure 11, 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 SA9904B integrated circuit are the current sense resistors, the voltage sense resistors as well as the bias setting resistor. r7 defines all on-chip and reference currents. with r7=47k , optimum conditions are set. 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 2.7 resistor giving a voltage drop across the termination resistor 86.4mv at rated conditions (imax for the meter). 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 16a on the current inputs at rated conditions. according to equation described in the current sense inputs section: bias resistor ct termination resistor current sense resistors r1 = r2 = (i / 16a ) x r / 2 = 80a /2500 / 16a x 2.7 / 2 = 2.7k i = line current / ct ratio lsh l the three current channels are identical so r1 = r2 = r3 = r4 = r5 = r6. voltage divider crystal oscillator 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 combining the two equations gives: ( ra + rb ) / 230v = rb / 14v a 24k resistor is chosen for r13 and a 1m resistor is used for r8. substituting the values result in: rb = 23.44k ra = rb x (230v / 14v - 1) ra = 361.6k. resistor values of r16, r19 and r22 is chosen to be 120k each. the three voltage channels are identical so r14= r15= r16 = r17 = r18 = r19 and r20 = r21= r22. a color burst tv crystal with f = 3.5795mhz is used for the oscillator. the oscillator frequency is divided down to 1.7897mhz on-chip, to supply the a/d converters as well as the digital circuitry.
figure 11: typical application circuit sames SA9904B 10/12 http://www.sames.co.za r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 r13 c1 c2 v1in v2 in v3 in c3 c4 c5 vss r14 r15 r16 r17 r18 r19 r20 r21 r22 c6 r25 ct1 ct2 ct3 r26 r27 vdd gnd gnd gnd gnd gnd v3 out v2 out v1 out r23 r24 vdd vss iip1 18 iin1 19 iip2 1 iin2 2 iip3 4 iin3 5 vref 15 vss 14 ivp1 17 ivp2 20 ivp3 3 gnd 16 vdd 6 do 9 cs 12 sck 8 di 13 osc1 10 f50 7 osc2 11 u1 dr-01600 x1 do cs di sck f50 neutral gnd
11/12 sames SA9904B http://www.sames.co.za symbol description detail SA9904B 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, 47k, 1/4w, 1%, metal resistor, 1m, 1/4w, 1%, metal resistor, 1m, 1/4w, 1%, metal resistor, 1m, 1/4w, 1%, metal resistor, 24k, 1/4w, 1%, metal resistor, 24k, 1/4w, 1%, metal resistor, 24k, 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, 120k, 1/4w, 1%, metal resistor, 120k, 1/4w, 1%, metal resistor, 120k, 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 u1 r1 r2 r3 pdip20 / soic20 r4 r5 r6 r7 r8 r9 r10 r11 r12 r13 r14 r15 r16 r17 r18 r19 r20 r21 r22 r23 r24 r25 r26 r27 resistor, 120k, 1/4w, 1%, metal capacitor, 220nf capacitor, 220nf capacitor, 820nf capacitor, 820nf capacitor, 820nf capacitor, 820nf current transformer, tz76 c1 c2 c3 c4 c5 c6 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 2 note 2 note 2 note 3 note 1: resistor (r1 to r6) values are depend ant on the selection of the termination resistors (r25 to r27) and ct combination. capacitor values may be selected to compensate for phase errors caused by the current transformers. capacitor c6 to be positioned as close as possible to supply pins v and v of u1. note 2: note 3: dd ss parts list for application circuit: figure 11 crystal, 3.57954mhz x1
sames sames SA9904B 12/12 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: for the latest updates on datasheets, please visit our web site: (012) 333-6021 +27 12 333-6021 (012) 333-8071 +27 12 333-8071 energy@sames.co.za http://www.sames.co.za. south african micro-electronic systems (pty) ltd tel: tel: int fax: fax: int p o box 15888 lynn east 0039 republic of south africa 33 eland street koedoespoort industrial area pretoria republic of south africa http://www.sames.co.za

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