If you do want to buffer the data you can use and 74hc08 like we do on the eval board. The output pins of the Arduino should be fine 5v right. I am using pin 9 of arduino as the slave select. Can you recommend any push-pull ic or open collector you have used? Right now i have connected these pins directly to the arduino. In the data-sheet it is recommended to drive the RESET, SCLK and CS pins with either a push-pull without an external resistor or with an open-collector with a 10kOhm pull-up resistor. Is this okay? Can you suggest what load/appliance I can use for getting 265mVRMS? In the case of 39mVRMS if i use gain 8 of full scale (ADC input range 0.5V) is it going to work? Can you give me some information on your CT Part#. But I am using no burden resistor, only the anti-alias filter. I am using a 200W incandescent bulb as a burden. This is too high so I am wondering if it already damaged the 7753? I am going to set a divider to give around 176mVRMS. This wireless energy monitoring system can collect the parameters from the digital energy meter through the internet communication. My Voltage divider currently gives 400mVRMS. The opamp also provides the reference voltage to the Arduino (AREF) to ensure that the full ranges of the A/D converters are used.
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