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SA2007P Datasheet(PDF) 5 Page - Sames |
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SA2007P Datasheet(HTML) 5 Page - Sames |
5 / 12 page 5/12 sames sames SA2007P http://www.sames.co.za INPUT SIGNALS VREF A bias resistor of 24kW set optimum bias and reference conditions on chip. Calibration of the SA2007P should be done as described in the Device Configuration section. Serial Data (SDA) The SDA pin connects directly to the SDA pin of an external EEPROM. The pin is used to transfer data between the EEPROM to the SA2007P. An external pull up resistor in not needed. Serial Clock (SCL) The SCL pin connects directly to the SCL pin of an external EEPROM. The SCL output is used to strobe data at a rate of 50kHz out of the EEPROM. An external pull up resistor in not needed. Configuration Reload (RLOAD) A falling edge on the RLOAD pin, will trigger a register update from the external EEPROM. This feature may be used during calibration to load updated register data in the SA2007P. For normal operation of the SA2007P the RLOAD pin may be left floating. OUTPUT SIGNALS Motor output (MOP, MON) The motor pulse width is programmable for 71ms and 142ms. The MON pulse will follow the MOP pulse within the selected pulse width time. This prevents that the motor armature is in the wrong position after a power failure. Both MOP and MON outputs are active high. One energy pulse is represented by a MOP pulse followed by a MON pulse. The motor drive wave forms are shown in figure 4. LED output (LED) Three options for the LED output pulse rate are available, 6400 and 3200 pulses per kWh, as well as a pulse rate of 1252 pulses per second at rated conditions. At 1252 pulse per second t is 71µs, for the other options t is 10ms. The LED LED LED output is active low as in figure 5. An integrated anti-creep function prevents any output pulses if the measured power is less than 0.02% of the meters rated current. Figure 4: Motor drive on MON and MOP pins Figure 5: LED pulse output Selected Input Indicator (SEL1) The SA2007P continuously compares the power consumptions on current channel 1 inputs and current channel 2 inputs. The larger of the two measurements is used for metering. The SEL1 output pin indicates which channel is currently being used for the pulse output. Signal Output Value Description SEL 1 0 1 Channel 1 selected (IIN1/IIP1) Channel 2 selected (IIN2/IIP2) Switching between channels will not be faster than once per second in case both channels are balanced. Earth Loop Tamper Indication (ELT) In case the power measurements from both current channels differ by more than 12.5%, (indicating a earth loop tamper condition), the ELT output is set to zero. The SA2007P continues to generate output pulses from the larger of the two measured powers in this condition. The ELT output is active low. Direction Indication (DIRO) The SA2007P provides information about the energy flow direction of both current channels on pin DIRO . A logic 1 on pin DIRO indicates reverse energy flow of both current channels. Reverse energy flow is defined as the condition where the voltage sense input and current sense input are out of phase (greater than 90 degrees). Positive energy flow, when voltage sense and both current sense input are in phase, is indicated on pin DIRO as a logic 0. The DIRO output will toggle between 1 and 0 a rate of 1Hz in case one of the current channels measure positive energy and the other negative energy. The condition may accure with a improper installed or tampered meter. The DIRO pin may be used to drive a LED in order to indicate reverse energy. VDD VDD VSS VSS MON MOP t m t m t m DR-01559 LED t LED DR-01332 VDD VSS Signal Output Value Description DIRO 1 0 Reverse energy flow Forward energy flow 1Hz Out of phase current channels PRELIMINARY |
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