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SA2005M Datasheet(PDF) 4 Page - Sames |
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SA2005M Datasheet(HTML) 4 Page - Sames |
4 / 12 page 4/12 sames sames SA2005M Figure 3: Analog input internal configuration http://www.sames.co.za FUNCTIONAL DESCRIPTION The SAMES SA2005M is a CMOS mixed signal analog/digital integrated circuit that performs three phase power/energy calculations across a power range of 1000:1 to an overall accuracy of better than Class 1. The integrated circuit includes all the required functions for 3- phase power and energy measurement such as oversampling A/D converters for the voltage and current sense inputs, power calculation and energy integration. Internal offsets are eliminated through the use of cancellation procedures. The integrated circuit includes all the required functions for a three phase mechanical counter-based meter design. A precision oscillator, that replaces an external crystal, is integrated on chip providing a temperature stable time base for the digital circuitry. A temperature stable voltage reference integrated on chip generates the reference current used by the analog circuitry. Voltage and current are sampled simultaneously by means of a sigma delta modulator type ADC and power is calculated for each individual phase. The power is fed to a programmable adder that allows the representation of the measured energy to be either total or absolute sum. The summed power is integrated and divided down to represent integrated energy. Pulses on the LED output and on the mechanical counter driver outputs represent measured amounts of energy. Programmable dividers provide flexible counter as well as calibration LED resolutions. Outputs for phase fail and voltage sequence faults and energy direction are available. Calibration of the device is done on the voltage sense inputs of the SA2005M. The SA2005M may be used in various meter designs by setting the RE, RA and IM pins to the appropriate state. See Input Signals section for the configuration settings. These features enable the meter manufacturer extremely flexible meter designs from a single integrated circuit. An integrated anti-creep function ensures that no pulses are generated at zero line currents. ELECTROSTATIC DISCHARGE (ESD) PROTECTION The SA2005M integrated circuit's inputs/outputs are protected against ESD. POWER CONSUMPTION The overall power consumption rating of the SA2005M integrated circuit is less than 80mW with a 5V supply. INPUT SIGNALS ANALOG INPUT CONFIGURATION The current and voltage sensor inputs are illustrated in figure 3. These inputs are protected against electrostatic discharge through clamping diodes, in conjunction with the amplifiers input configuration. The feedback loops from the outputs of the amplifiers A and A generate virtual shorts on the signal inputs. I V Exact duplications of the input currents are generated for the analog processing circuitry. The current and voltage sense inputs are identical. Both inputs are differential current driven up to ±25µA peak. One of the voltage sense amplifiers input terminals is internally connected to GND. This configuration is possible because the voltage sense input is much less sensitive to externally induced parasitic signals compared to the current sense inputs. Voltage Sense Inputs (IVN1, IVN2, IVN3) The mains voltages are measured by means of resistor dividers and the divided voltages are converted to currents. The current into each voltage sense input (virtual ground) should be set to 14µARMS at rated voltage conditions. The individual mains voltages are divided down to 14V per RMS phase. The resistors R12, R13 and R14 (figure 8) set the current for the voltage sense inputs. The voltage sense inputs saturate at an input current of ±25µA peak. VOLTAGE SENSOR INPUT IVP DR-01288 SS V CURRENT SENSOR INPUTS IIP IIN SS V VDD SS V VDD DD V GND A V A I |
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