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SA2002HPA Datasheet(PDF) 6 Page - Sames |
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SA2002HPA Datasheet(HTML) 6 Page - Sames |
6 / 12 page sames sames SA2002H 6/12 http://www.sames.co.za ELECTROSTATIC DISCHARGE (ESD) PROTECTION The SA2002H integrated circuit's inputs/outputs are protected against ESD. POWER CONSUMPTION The power consumption rating of the SA2002H integrated circuit is less than 25mW. INPUT SIGNALS VREF A bias resistor of 24kW set optimum bias conditions on chip. Calibration of the SA2002H should be done on the voltage input as described in Typical Applications. Current sense input (IIP and IIN) Figure 6 shows the typical connections for the current sensor input. The resistor R1 and R2 define the current level into the current sense inputs of the SA2002H. At maximum rated current the resistor values should be selected for input currents of 16µA . RMS Values for resistors R1 and R2 can be calculated as follows: R1 = R2 = (I /16µA) x RSH/2 L Where I = Line current L RSH = Shunt resistor or termination resistor if a CT is used as the current sensor. The value of RSH, if used as the CT's termination resistor, should be less than the DC resistance of the CT's secondary winding. The voltage drop across RSH should not be less than 16mV at rated currents. RMS Voltage Sense Input (IVP) The current into the A/D converter should be set at 14µA at RMS nominal mains voltage. The voltage sense input saturates at an input current of ±25µA peak. Referring to figure 6 the typical connections for the voltage sense input is illustrated. Resistors R3, R4 and R5 set the current for the voltage sense input. The mains voltage is divided down to 14V . The current into the RMS A/D converter input is set at 14µA via resistor R5. RMS OUTPUT SIGNALS Pulse output (FOUT) The output on FOUT is a pulse density signal representing the instantaneous power/energy measurement as shown in figure 8. The pulse width on FOUT changes with the direction of energy measurement by the device. The width of t is 71,5µs p for positive energy and doubles if negative energy is measured. The output frequency may be calculated using the following formula: 2 f = 11.16 x FOUT x ( I x I ) / I IV R Where: FOUT = Typical rated output frequency (1360Hz) I = Input current on current sense input (16µA at rated I conditions) I = Input current on voltage sense input (16µA at rated V conditions) I = Reference current on VREF typically 50µA R An integrated anti-creep function does not allow output pulses on FOUT if no power is measured by the device. Figure 8: FOUT instantaneous pulse output POWER DR-01282 FOUT V x I vMAINS P t t t t |
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