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Three Phase Power / Energy IC with SPI Interface SA9904B
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
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+ + + + + +
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 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. 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 mains voltage zero crossover is available on the F50 output. The SA9904B includes all the required functions for threephase 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-inline plastic (PDIP20), as well as 20 pin small outline (SOIC20) package types.
VDD
VSS
IIP1 IIN2 IIP2 IIN2 IIP3 IIN3 IVP1 IVP2 IVP3
ACTIVE CURRENT ADC DI REACTIVE SPI RMS VOLTAGE VOLTAGE ADC MAINS FREQ. F50 DO SCK CS
GND
VOLTAGE REF.
OSC
DR-01641
VREF OSC1 OSC2
Figure 1: Block diagram
SPEC-0447 (REV. 6)
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SA9904B ELECTRICAL CHARACTERISTICS
(VDD = 2.5V, VSS = -2.5V, over the temperature range -10C to +70C , unless otherwise specified.)
#
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Symbol
Parameter Operating temp. Range Supply Voltage: Positive Supply Voltage: Negative Supply Current: Positive Supply Current: Negative Current Sensor Inputs (Differential) Input Current Range
Min -25 2.25 -2.75
Typ
Max +85 2.75 -2.25
Unit C V V mA mA
Condition
TO VDD VSS IDD ISS
9.5 9.5
11 11
III
-25
+25
A
Peak value
Voltage Sensor Input (Asymmetrical) Input Current Range Pins SCK High Voltage Low Voltage IIV VIH VIL fSCK tLO tHI Pins CS, DI High Voltage Low Voltage Pins F50, DO Low Voltage High Voltage Oscillator Pin VREF Ref. Current Ref. Voltage VIH VIL VOL VOH -25 VDD-1 VSS+1 800 0.6 0.6 VDD-1 VSS+1 VSS+1 VDD-1 +25 A V V kHz s s V V V V IOL = 5mA IOH = -2mA Peak value
Recommended crystal: TV colour burst crystal f = 3.5795 MHz -IR VR 23 1.1 25 27 1.3 A V With R = 47kW connected to VSS Reference to VSS
ABSOLUTE MAXIMUM RATINGS*
Parameter Supply Voltage Current on any pin Storage Temperature Operating Temperature
Symbol
Min 3.6V -150 -40 -40
Max 6.0 +150 +125 +85
Unit V mA C C
VDD -VSS IPIN TSTG TO
*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.
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. http://www.sames.co.za
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SA9904B PIN DESCRIPTION
PIN 16 6
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Designation GND VDD Description Analog Ground. The supply voltage to this pin should be mid-way between VDD and VSS. 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.
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. Analog Input for Voltage Phase 1, Phase 2 and Phase 3. The current into the A/D converter should be set at 14ARMS at nominal mains voltage. The voltage sense input saturates at an input current of 25A peak.
14
VSS
17, 20, 3
IVP1, IVP2, IVP3
18, 19, 1, 2, 4, 5
IIP1, IIN1, IIP2, IIN2, Inputs for current sensors. The shunt resistor voltage from each channel is converted to a current of 16ARMS at rated conditions. The current sense input IIP3, IIN3 saturates at an input current of 25A peak. VREF OSC1, OSC2 SCK DO F50 DI CS
This pin provides the connection for the reference current setting resistor. A 47kW resistor connected to sets the optimum operating condition. Connections for a crystal or ceramic resonator. (OSC1 = input; OSC2 = Output) Serial clock in. This pin is used to strobe data in and out of the SA9904B Serial data out. Data from the SA9904B is strobed out on this pin. DO is only driven when CS is active. Voltage zero crossover. The F50 output generates a pulse, on every rising edge of the mains voltage for any one phase. Serial data in. Data is only accepted during an active chip select (CS). Chip select. The CS pin is active high.
15 10, 11 8 9 7 12 13
IIP2 IIN2 IVP3 IIP3 IIN3 VDD F50 SCK DO OSC1
1 2 3 4 5 6 7 8 9 10
Dr-01642
20 19
IVP2 IIN1
ORDERING INFORMATION
Part Number SA9904BPA SA9904BSA Package PDIP20 SOIC20
18 IIP1 17 IVP1 16 GND 15 VREF 14 VSS 13 CS 12 DI
11 OSC2
Figure 2: Pin connections: Package: PDIP20, SOIC20
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SA9904B 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 threephase power and energy measurement such as oversampling A/D converters for the voltage and current sense inputs, power calculation and energy integration.
Calibration LED
IIP
V DD
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CURRENT SENSOR INPUTS
VSS VDD
AI
IIN
VSS VDD
Current Sensing
SA9904B
Active Energy Reactive Energy VRMS and Frequency Measurements
SPI
MicroController
IVP VOLTAGE SENSOR INPUT
V SS
AV
Voltage Sensing
EEPROM LCD
Power Supply
N L1 L2 L3
Dr-01643
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.
GND DR-01288
Figure 4: Analog input internal configuration 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: R1 = R2 = (IL / 16ARMS) x Rsh / 2 R3 = R4 = (IL / 16ARMS) x Rsh / 2 R5 = R6 = (IL / 16ARMS) x Rsh / 2
Ch3 In CH2 In
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.
INPUT SIGNALS
Analog Input Configuration 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 AI and AV 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. Current Sense Inputs (IIN1, IIP1, IIN2, IIP2, IIN3, IIP3) At rated current (IMAX) the resistor values should be selected for input currents of 16ARMS. Referring to figure 5, the resistors R1
CH1In IMAX Neutral GND CT1 IMAX Rsh1 IMAX GND CT2 Rsh2 R3
16A
RMS
R1
> 20mV
16A
RMS
IIN1
RMS
R2 IIP1
IIN2
> 20mV
RMS
SA9904B
IIP2
16A
R4 GND CT3 Rsh3 R5
> 20mV
RMS
IIN3
RMS
R6 IIP3 GND CH3 Out CH2 Out CH1 Out
Dr-01644
Figure 5: Current sense input configuration
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SA9904B
Where: IL = Line current or if a CT is used IL = Line current / CT ratio Rsh = Shunt resistor or CT termination resistor. Rsh should be less than the resistance of the CT's secondary winding.
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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.
Voltage Sense Input (IVP1, IVP2, IVP3) 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 14ARMS at rated voltage conditions. The voltage sense inputs saturate at an input current of 25A peak.
14V
RMS
Serial Data In (DI) 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). 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.
Ch1 Voltage Neutral
Dr-01645
R16
R19
R22
C5
R8
14A
OUTPUT SIGNALS
RMS
IVP1
Serial Data Out (DO)
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.
R13 GND GND
Figure 6: Voltage sense input configuration The individual mains voltages are divided down to 14VRMS 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 between the voltage sense and current sense input 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: C = 1 / (2 x p x Mains frequency x R5 x tan (Phase shift angle)) C = 1 / (2 x p x 50Hz x 1MW x tan (0.18 degrees)) C = 1.013F
Mains Voltage sense zero crossover (F50)
The F50 output generates a signal, which follows the mains voltage zero crossings, see figure 7. 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. The micro controller can use the F50 to extract mains timing.
Phase Voltage
F50
Dr-01646
+5V
1ms to 2ms
0V (Vss) 1ms to 2ms
Figure 7: Mains voltage zero crossover
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
Reference Voltage (VREF) The VREF pin is the reference for the bias resistor. With a bias resistor of 47kW connected to Vss optimum conditions are set. Serial Clock (SCK) The SCK pin is used to synchronize data interchange between
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SA9904B
and the SCK pin of the SA9904B. The DI and DO pins are the serial data input and output pins for the SA9904B, respectively.
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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:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 0 0 0 0 0 1 1 0 A5 A4 A3A2A1 A0
Register Access
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.
Data format
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.
ID 1 2 3 4 5 6 7 8 9
Register Active Phase 1 Reactive Phase 1 Voltage Phase 1 Frequency Active Phase 2 Reactive Phase 2 Voltage Phase 2 Frequency Active Phase 3
Header A5 A4 A3 A2 A1 A0 bits 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 X X X X X X X X X X X X X X X X X X X X X X X X 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1
SCK t3 t4
DI t2 t5
10 Reactive Phase 3 11 Voltage Phase 3
DO t1
12 Frequency
Table 1: Register address 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 1 1 0 A5 A4 A3 A2 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.
CS
DR-01545
Parameter Description t1 t3 t4 t2 SCK rising edge to DO valid SCK min high time SCK min low time Setup time for DI and CS
Min
Max
625ns 1.160s 625ns 625ns
before the rising edge of SCK 20ns t5 DI hold time 625ns
Figure 9: SPI Timing diagrams with timing information
SCK
CS Read command DI DO 0 1 1 0 Register address A5 A4 A3 A2 A1 A0 Register Data D23 D22 D21 D1 D0 Next data register High impedance D23 D22 D1 D0
Dr-01647
Figure 8: SPI waveforms
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SA9904B 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.
23 22 21 20 19 10 9 8 7 6 5 4 3 2 1 0
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Using this delta value will result in incorrect calculations.
Voltage registers
The three voltage registers contain the RMS voltage measured for each phase. The RMS voltage measurement is accurate to 1% for a range of 50% to 115% of the rated mains voltage.
23 22 21 20 19 10 9 8 7 6 5 4 3 2 1 0
Active or Reactive Energy Register
The register values will increment for positive energy flow and decrement for negative energy flow as indicated in figure 10.
Register wrap around Positive energy flow Register values
0 H7FFFFF ................ (8388607) H800000 (8388608) HFFFFFF ................ (16777215)
Voltage Register
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.
Frequency Register
23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Negative energy flow Register wrap around
DR-01590
Figure 10: Register increment / decrement showing the register wrap around 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:
Mains Frequency Not used Missing phase Phase sequence error Voltage zero crossover
Bit location Description 0 to 9 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 D19 D20 Missing phase 1X X Phase 1 X1 X Phase 2 XX 1 Phase 3 The phase error status can be ascertained from these two bits. D21 D22 Missing phase 0 0 No phase error 0 1 Phase sequence error. 1 X Missing phase Voltage zero crossover. This bit changes state with the rising edge of the mains voltage.
Description Present register value new_val - old_val =
Variable
Decimal
Hex 21,22
new_val 16767215 0x00FFD8EF 16744955 0x00FF81FB 22260 0x000056F4 delta_val
Previous register value old_val
The register now wraps around so after the next read the values are as follows: Present register value new_val - old_val =
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new_val
12259 0x00002FE4 23
Previous register value old_val
16767215 0x00FFD8EF delta_val -16754956 0x00FFA90B
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SA9904B POWER CALCULATION
Instantaneous power signals are generated by multiplying the current and voltage signals, for active power = V x I x Cos(o) and for reactive power = V x I x Sin(o). 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.
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Mains voltage 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 Where VRATED VREGISTER VALUE = = = VRATED x VREGISTER VALUE / 700 Rated mains voltage of meter Voltage register value
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 = (VRATED x IRATED)/ 320000 (In watt seconds or var seconds) Where: VRATED = Rated mains voltage of meter = Rated mains current of meter IRATED
The active and reactive power measured by the SA9904B is calculated as follows: Power = VRATED x IRATED x N / INTTIME / 320000 (in Watt or VAR) Where: VRATED = = IRATED N = INTTIME =
Mains frequency register
The mains frequency measured by the SA9904B is calculated as follows: Frequency = FCRYSTAL / 256 / FREGISTER VALUE where FCRYSTAL The external crystal frequency. = FREGISTER VALUE = Bits D9 to D0 of the frequency register.
Rated mains voltage of meter Rated mains current of meter Difference in register values between successive reads (delta value) Time difference between successive register reads (in seconds)
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SA9904B 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 4wire 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.
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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 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.
BIAS RESISTOR
R7 defines all on-chip and reference currents. With R7=47kW, optimum conditions are set.
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 86.4mV 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 16A on the current inputs at rated conditions. According to equation described in the Current Sense inputs section:
CRYSTAL OSCILLATOR
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.
= (IL / 16A ) x RSH / 2 = 80A /2500 / 16A x 2.7W / 2 = 2.7kW IL = Line current / CT Ratio
R1 = R2
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SA9904B
Neutral R14 R12 R15 R11 R16 R19 R22 R18 R21 R17 R20
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CT1 19 IIN1 GND IVP1 R2 18 IIP1 IVP2 R3 2 IIN2 IVP3 3 R26 F50 SCK DI CS DO R4 1 IIP2 GND CT3 IIN3 VDD R6 4 GND R7 15 14 VSS VREF VSS DR-01600 OSC2 VDD 11 GND 6 VDD VSS R24 C1 C6 R23 IIP3 OSC1 10 X1 C2 R27 R5 5 F50 SCK DI CS DO 7 8 12 13 9 20 GND CT2 R9 R10 17 R8 GND 16 R25 R1 U1 R13 C5 C4 C3
GND
V3 In
V2 In
V1In
Figure 11: Typical application circuit
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V3 Out
V2 Out
V1 Out
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SA9904B
Parts List for Application Circuit: Figure 11
Symbol U1 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 C1 C2 C3 C4 C5 C6 CT1 CT2 CT3 X1 Description 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, 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 Capacitor, 220nF Capacitor, 220nF Capacitor, 820nF Capacitor, 820nF Capacitor, 820nF Capacitor, 820nF Current Transformer, TZ76 Current Transformer, TZ76 Current Transformer, TZ76 Crystal, 3.57954MHz
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Detail PDIP20 / SOIC20 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 VDD and VSS of U1.
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SA9904B
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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 (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 LYNN EAST 0039 REPUBLIC OF SOUTH AFRICA
33 ELAND STREET KOEDOESPOORT INDUSTRIAL AREA PRETORIA REPUBLIC OF SOUTH AFRICA
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