How to reduce noise in HTRC110

[kandhu26]

I am using HTRC110 is interfaced with Xmega32a4 controller... Clk, Dout, Din these 3 pins of htrc110 interfaced with controller... When i am not showing the card the Dout pin of htrc110 should be high... But The Dout is toggling continuously[i.e. noise is high]....Can any 1 help me how to reduce these noise... Because of these noise tag reading speed has got decreased...

 

[kevins963]

I am having the same problem with the HTRC110 chip. When I initiate a read command the DOUT pin toggle even when no tag is within range of the reader. Have you found a solution to this yet?

Thanks,

Kevin

 

[LJay]

Hi, I took over USB RFID reader project after my former coworker and I´m dealing with the same problem. The HTRC circuit is powered directly from USB voltage (no voltage regulator or isolator), throught ferrite bead to 100nF and 10uF capacitors in paralel.

I think the problem lies in unstable supply voltage, because if i connect the HTRC to a separated voltage source, DOUT noise disappear and signal stay in hi level for all the time.

Am I right or can be this problem be caused by other influence? Can you give me any advice how to clear USB sypply voltage?