SA9607P

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Programmable Single Phase Energy Metering IC with Tamper Detection SA9607P FEATURES s s s s s Provides direct interface to mechanical counters Calibration and setup stored on external EEPROM - no trimpots required Monitors both Live and Neutral for tamper detection Performs bidirectional energy measurement Flexible programmable features s s s s s Meets the IEC 521/1036 Specification for Class 1 AC Watt hour meters Total power consumption rating below 25mW Adaptable to different types of sensors
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  SPEC-0006 (REV. 2) 24-05-00 FEATURES s Provides direct interface to mechanical counters s Calibration and setup stored on external EEPROM - notrimpots required s Monitors both Live and Neutral for tamper detection s Performs bidirectional energy measurement s Flexible programmable features Programmable Single Phase Energy MeteringIC with Tamper Detection IIN1IIP1IIP2IVPANALOGSIGN ALPRO-CESSINGANDPOW ERCAL-CULATIONCOM-PARATORPOW ERTOPULSERATEIICBUSINTER-FACEVOLTAGEREF.OSCELTVSSVDDSEL1DIROLEDMOPMONCNFVREF D r-01 565 OSC1 OSC2 SDASCLPOW ER 1 (DIGITAL)POW ER 2 (DIGITAL)GNDIIN2 SA9607P s Meets the IEC 521/1036 Specification for Class 1 AC Watthour meters s Total power consumption rating below 25mW s Adaptable to different types of sensors s Operates over a wide temperature range s Precision voltage reference on chip. DESCRIPTION The SAMES SA9607P is a single-phase bidirectional energymetering integrated circuit. It provides a cost effective solutionfor energy meters with electro-mechanical displays, such asstepper motors and impulse counters.Two current sensor inputs allow the measurement of energyconsumption on both the live and neutral lines.Direction detection of energy flow as well as other commontamper conditions are flagged.The power consumption on both the live and neutral arecontinuously measured and the larger of the two is selectedfor energy metering.The SA9607P drives the calibration LED and theelectromechanical counter directly.The SA9607P does not require any external trim-pots. Allrequired calibration and configuration data is read from asmall external EEPROM.The SA9607P integrated circuit is available in 20 pin dual-in-line plastic (DIP-20) and small outline (SOIC-20) packagetypes. Figure 1: Block Diagram  1/12  SA9607P http://www.sames.co.za. 2/12ELECTRICAL CHARACTERISTICS (V DD = 2.5V, V SS = -2.5V, over the temperature range -10°C to +70°C # , unless otherwise specified.) Parameter SymbolMinTypMaxUnitCondition Operating temp. rangeT o -25+85°CSupply Voltage: PositiveV DD 2.252.75VSupply Voltage: NegativeV SS -2.75-2.25VSupply Current: PositiveI DD 56mASupply Current: NegativeI SS 56mACurrent Sensor Inputs (Differential)Input Current RangeI II -25+25µAPeak valueVoltage Sensor Input (Asymmetrical)Input Current RangeI IV -25+25µAPeak valuePin CNFInput High VoltageV IH V DD -1VInput Low VoltageV IL V SS +1VPin MOP, MON, LED, SCLOutput High VoltageV OH V DD -1VI OH = -2mAOutput Low VoltageV OL V SS +1VI OL = 5mAPin SEL1, ELT, SDA, DIROBi-directInput High VoltageV IH V DD -1VInput Low VoltageV IL V SS +1VPin VREFWith R = 24k Ω Ref. Current-I R 455055 µAconnected to V SS Ref. VoltageV R 1.11.3 VReferred to V SS OscillatorRecommended crystal:TV colour burst crystal f = 3.5795 MHz # Extended Operating Temperature Range available on request. ABSOLUTE MAXIMUM RATINGS* ParameterSymbolMinMaxUnit Supply VoltageV DD -V SS -0.36.0VCurrent on any pinI PIN -150+150mAStorage TemperatureT STG -40+125°COperating TemperatureT O -25+85°C*Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stressrating only. Functional operation of the device at these or any other condition above those indicated in the operational sectionsof this specification, is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability.  SA9607P http://www.sames.co.za. 3/12 Figure 2: Pin connections: Package: Dip-20, SOIC-20  DR-01557 1IIN1 GNDSEL1IIP1 IVPCNFIIN2 DIROVSSIIP2VREFSCLSDAVDDELTLEDMOPOSC2OSC1MON23456 1514131211109871617181920 ORDERING INFORMATIONPart NumberPackage SA9607PPADIP-20SA9607PSASOIC-20 PIN DESCRIPTION PIN 20814191, 23, 45679, 12131516171810, 11 Description Analog Ground. The voltage to this pin should be mid-way between V DD and V SS .Positive supply voltage. The voltage to this pin is typically +2.5V if a shunt resistor is used for current sensingor in the case of a current transformer a +5V supply can be applied.Negative Supply Voltage. The voltage to this pin is typical -2.5V if a shunt resistor is used for current sensingor in the case of a current transformer a 0V supply can be applied.The current into the A/D converter should be set at 14µA RMS at nominal mains voltage. The voltage senseinput saturates at an input current of ±25µA peak.Inputs for current sensor - channel 1 and Channel 2. The shunt resistor voltage from each channel isconverted to a current of 16µA RMS at rated conditions. The current sense input saturates at an input currentof ±25µA peak.This pin provides the connection for the reference current setting resistor. A 24k Ω resistor connected to V SS set the optimum operating condition.Serial clock output. This output is used to strobe data from the external EEPROM.Serial data. Send and receive data from an external EEPROM.Motor pulse outputs. These outputs can be used to drive an impulse counter or stepper motor directly.Calibration LED output. Refer to section Led Output (LED) for the pulse rate output options.Configure / Test input. For normal operation this pin must be connected to V SS. Current channel select output. This output indicates which channel is been used for kWh metering.Earth loop tamper output. This output indicates an earth loop tamper condition.Direction output. This output indicates the energy flow direction.Connections for a crystal or ceramic resonator. (OSC1 = input; OSC2 = Output) Designation GNDV DD V SS IVPIIN1, IIP1IIN2, IIP2VREFSCLSDAMON, MOPLEDCNFSEL1ELTDIROOSC1, OSC2  SA9607P http://www.sames.co.za. 4/12FUNCTIONAL DESCRIPTION The SA9607P is a CMOS mixed signal analog/digital integratedcircuit, which performs power/energy calculations across apower range of 1000:1, to an overall accuracy of better thanClass 1.The integrated circuit includes all the required functions forsingle phase power and energy measurement such asoversampling A/D converters for the voltage and currentsense inputs, power calculation and energy integration. Internaloffsets are eliminated through the use of cancellationprocedures. The SA9607P incorporates an anti-tamper schemeby continuously measuring the power consumption on bothLIVE and NEUTRAL lines. A fault is indicated when thesemeasurements differ by more than 12.5%. The SA9607Pgenerates pulses with a frequency proportional to the larger ofthe two current measurements. The source (LIVE or NEUTRAL)for these pulses is indicated on the SEL1 pin.Various pulse outputs (MOP, MON and LED) are available.The pulse rate on these pins follows the active powerconsumption measured.A low voltage stepper may be driven directly from the deviceby connecting it between the MOP and MON pins, alternativelyan impulse counter may be driven directly by connecting itbetween MOP and V SS .The SA9607P configures itself from an external low costEEPROM that contain all meter configurations and calibrationdata. No external trimming is required for this device. Calibrationof the device may be fully automated. POWER CALCULATION In Figure 7, the voltage drop across the current transformersterminating resistor will be between 0 and 16mV RMS . Thesevoltages are converted to currents for each current senseinput, by means of resistors R 1 and R 2 (channel 1) as well asR 3 and R 4. (channel 2).The current sense input saturates at an input current of ±25µApeak. The mains voltage (230VAC) is divided down through adivider to 14V RMS . The current into the A/D converter input isset at 14µA RMS at nominal mains voltage, via resistor R 6 (1M Ω) .See Device Configuration for more details on the processingof measured energy to frequency outputs. ANALOG INPUT CONFIGURATION The input circuitry of the current and voltage sensor inputs areillustrated in figure 3. These inputs are protected againstelectrostatic discharge through clamping diodes.The feedback loops from the outputs of the amplifiers A I andA V generate virtual shorts on the signal inputs. Exactduplications of the input currents are generated for the analogsignal processing circuitry. AUTOMATIC DEVICE CONFIGURATION (BOOT UP) During power up, registers containing configuration andcalibration information is updated from an external EEPROM.The device itself never writes to the EEPROM so any writeprotect features offered by manufacturer of EEPROM's maybe used to protect the configuration and calibration constantsof the meter. The device reloads its configuration every 1193seconds from the external EEPROM in order to ensure correctoperation of the meter. Every data byte stored in the EEPROMis protected with a checksum byte to ensure data integrity. ELECTROSTATIC DISCHARGE (ESD)PROTECTION The SA9607P integrated circuit's input's/outputs are protectedagainst ESD. POWER CONSUMPTION The power consumption rating of the SA9607P integratedcircuit is less than 30mW. VOLTAGESENSORINPUTIVPDR-01288 SSV CURRENTSENSORINPUTSIIPIIN SSVVDDSSVVDDDDV GND A V A I Figure 3: Analog Input Internal Configuration 
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