Design an isolated FET interface with ISO721!

Thanks to Thomas!

I have designed an electronic Watt-Hour Meter with MSP430FE427 for Central Viet Nam market.

I have read the datasheet MSP430Fe42xA and slaa203c.pdf .

Please help me the hardware with schematic for E-meter ( Voltage: 220V - Frequency: 50Hz).

I want to use  swtching power with low voltage dectected module.

I will appreciate if you tell me how to design this schematic.

Best wishes to Thomas!

Bui Anh Kieu

CPC IT&T (Central Power Company IT&T)

Da Nang City, Viet Nam

Hello Bui Anh Kieu,

Unfortunately I am no micro controller expert.

I tried to move your request to our MSP430 forum but I am not sure whether this forum software worked correctly.

I suggest that you ask your question again in the MSP430 forum.

So that I cannot help you more.

Regards, Thomas

Hello Thomas,

Maybe you got a mistake in the pdf with two schematic, please check the direction IN/OUT  of TMS/ CTMS pin.

Also I can't find the ISO7642!

Thanks!

Yes you are right.

I made mistake.

Sorry but ISO7642 is not our yet. Only version is ISO7242C or ISO7242M for minimu delay.

Regards,

Thomas

Hi again,

I have corrected the schematic. And now you need ISO7641 which is available.

Best regards,

Thomas

Hi Thomas,

I have designed following your schematic and i'm requesting ISO721. 

But these ideals in forum said "this schematic did not work". I'm confusing with these ideals.

Please tell me the suggestion for designing JTAG with ISO721?

Thanks for your help!

Best regards!

Bui Anh Kieu