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SA2002E Arkusz danych(PDF) 6 Page - Sames |
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SA2002E Arkusz danych(HTML) 6 Page - Sames |
6 / 10 page sames SA2002E 6/10 http://www.sames.co.za ELECTROSTATIC DISCHARGE (ESD) PROTECTION POWER CONSUMPTION INPUT SIGNALS The SA2002E integrated circuit's inputs/outputs are protected against ESD. The power consumption rating of the SA2002E integrated circuit is less than 25mW. A bias resistor of 24k set optimum bias conditions on chip. Calibration of the SA2002E should be done on the voltage input as described in Typical Applications. 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 SA2002E. At maximum rated current the resistor values should be selected for input currents of 16µA . Values for resistors R1 and R2 can be calculated as follows: R1 = R2 = (I /16µA) x RSH/2 Where I = Line current 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. The current into the A/D converter should be set at 14µA at 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 A/D converter input is set at 14µA via resistor R5. VREF Current sense input (IIP and IIN) Voltage Sense Input (IVP) W RMS L L RMS RMS RMS RMS OUTPUT SIGNAL Pulse output (FOUT) The output on FOUT is a pulse density signal representing the instantaneous power/energy measurement as shown in figure 8. The minimum timing characteristics are shown in the figure 9. The output frequency may be calculated using the following formula: f = 11.16 x FOUT x ( I x I ) / I Where: FOUT = Typical rated output frequency (1160Hz) I = Input current on current sense input (16µA at rated conditions) I = Input current on voltage sense input (16µA at rated conditions) I = Reference current on VREF typically 50µA An integrated anti-creep function does not allow output pulses on FOUT if no power is measured by the device. IV R I V R 2 Figure 8: FOUT instantaneous pulse output Figure 9: FOUT pulse width POWER DR-01282 FOUT Vx I vMAINS P t t t t 71µs min. 71µs DR-01151 |
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