U2270 sch and antenna design needed

[7rots51]

I tested the U2270 first sch in its datasheet ,I have 125kHZ wave output but I have no data output ,why?

Please if anyone have a tested sch send it for me.

Please send the antenna spec for it(diameter,numberof turns, wire thickness)

 

[erikl]

Please send the antenna spec for it (diameter, number of turns, wire thickness)

See the Example in the U2270B Antenna Design Hints (p. 9 ff). Wire thickness isn't critical, AFAIK.

 

[luben111]

Normal mistake - there is missing pullup on the U2270B output (the pin is open drain)