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SA2002P 数据表(PDF) 5 Page - Sames |
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SA2002P 数据表(HTML) 5 Page - Sames |
5 / 14 page 5/14 sames SA2002P http://www.sames.co.za INPUT SIGNALS VREF Serial Data (SDA) Serial Clock (SCL) A bias resistor of 24k set optimum bias conditions on chip. Calibration of the SA2002P should be done as described in the Device Configuration section. 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 SA2002P. An external pull up resistor in not needed. 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. The SCL output uses a soft driver and may be overdriven by the calibration equipment. W Current sense input (IIP and IIN) Voltage Sense Input (IVP) Figure 9 on page 11 shows the typical connections for the current sensor input. The resistor R6 and R7 define the current level into the current sense inputs of the SA2002P. At maximum rated current the resistor values should be selected for input currents of 16µA . The values for resistors R6 and R7 can be calculated as follows: R6 = R7 = (IL/16µA) x RSH/2 IL = Line current or line current/CT ratio 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. This is to allow a variation of ±10% for the mains voltage without saturating the voltage sense input. The voltage sense input saturates at an input current of ±25µA peak. Referring to Figure 9 the typical connections for the voltage sense input is illustrated. Resistors R1, R2 and R3 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 R12. RMS RMS RMS RMS RMS Where: Figure 4: Motor drive on MON and MOP pins Reload (RLOAD) Motor Output (MOP, MON) 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 SA2002P. For normal operation of the SA2002P the RLOAD pin may be left floating. The TEST input is the manufacturers test pin and must be connected to V for normal operation. 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. One energy pulse is represented by a MOP pulse followed by a MON pulse. The motor drive wave forms are shown in figure 4. Test Input (TEST) SS OUTPUT SIGNALS VDD VDD VSS VSS MON MOP t m t m t m DR-01559 Figure 5: LED pulse output LED t LED DR-01332 VDD VSS LED Output (LED) The LED pin provides a pulse output and is intended for calibration purposes. Depending on register Cled the pulse rate can be either in slow mode or fast mode. When in slow mode the pulse rate is a low frequency and is proportional to the average power consumption. In fast mode the pulse rate is a programmable high frequency output proportional to the instantaneous power consumption. This mode is useful for fast calibration times or can be used to interface to a micro- controller. In slow mode the pulse width (tled) is 1ms and in fast mode tled is 71µs. The LED output is active low as shown in figure 5. |
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类似说明 - SA2002P |
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