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SA2005PSA Datasheet(PDF) 5 Page - Sames |
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SA2005PSA Datasheet(HTML) 5 Page - Sames |
5 / 16 page 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 SA2005P. For normal operation of the SA2005P the RLOAD pin may be left floating. Test Inputs (TEST) The TEST input is the manufacturers test pin and must be connected to VSS in a metering application. OUTPUT SIGNALS LED Output (LED) Four options for the LED output pulse rate are available, 6400, 3200, 1600 pulses per kWh, and a pulse rate of 1252 pulses per second at rated conditions. At 1252 pulses per second t LED is 71µs, for the other options tLED is 10ms. The LED output is active low as shown in figure 4. sames sames SA2005P http://www.sames.co.za Figure 5: Motor drive on MON and MOP pins of device VDD VDD VSS VSS MON MOP t m t m t m DR-01559 Figure 4: LED pulse output LED t LED DR-01332 VDD VSS rated current the resistor values should be selected for input currents of 16µA . Referring to figure 8, the resistors R1 and RMS 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 level into the current sense inputs of the SA2005P. The current sense inputs saturates at an input current of ±25µA peak. Resistors R29, R30 and R31 are used as current transformer termination resistors. The voltage drop across the termination resistors should be at least 20mV at rated conditions. Values for the current sense inputs are calculated as follows: R1 = R2 = ( IL / 16µARMS ) x R29 / 2 R3 = R4 = ( IL / 16µARMS ) x R30 / 2 R5 = R6 = ( IL / 16µARMS ) x R31 / 2 Where: I = Line current/CT-ratio L In case a current transformer is used for current sensing the value of the termination resistors should be less than the resistance of the CT's secondary winding. Voltage Sense Inputs (IVN1, IVN2, IVN3) The mains voltage are measured by means of a resistor divider and the divided voltage are converted to a current. The current into the voltage sense inputs (virtual ground) should be set to 14µARMS at rated voltage conditions. The individual mains voltages are divided down to 14V per phase. The resistors RMS R12, R13 and R14 (figure 8) set the current for the voltage sense inputs. The voltage sense inputs saturate at an input current of ±25uA peak. Voltage Reference Connection (VREF) A bias resistor of 24k provides an optimum bias conditions on chip. Calibration of the SA2005P is done by means of divider ratios stored on an external EEPROM. This is 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 and the SA2005P. An external pull-up resistor in not needed. Serial Clock (SCL) The SCL pin connects directly to the SCL 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 is not needed. The SCL output uses a soft driver and may be overdriven by the calibration equipment. 5/16 Motor Output (MOP, MON) The motor pulse width is programmable for 71ms, 142ms and 284ms. The MON pulse will follow the MOP pulse within the selected pulse width time. This prevents the motor armature being in the wrong position after a power failure. Both MOP and MON outputs are active high. A MOP pulse followed by a MON pulse represents one energy pulse. The motor drive waveforms are shown in figure 5. Multiplex Output (PH/ DIR) The PH/DIR output enables either direction or voltage information on the phase LED driver outputs (PH1, PH2 and PH3). This multiplex output switches between logic 1 and 0 at a frequency of approximately 280Hz. A logic 1 enables energy direction information on the LED driver outputs and a logic 0 enables voltage information. |
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