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I want to connect FT232R chip to android phone. I have downloaded FTDI terminal for android from https://play.google.com/store/apps/details?id=com.ftdi.j2xx.hyperterm FTDI program has to startautomaticly when I connect FT232R chip to phone. Sometimes it works fine, but sometimes android does not detects chip. sometimes chip is detected only 1 of 10 times. What could be the reasons? enter image description here

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  • \$\begingroup\$ Schematic of how everything is hooked up? \$\endgroup\$ Commented Feb 2, 2015 at 19:22

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From FT232R datasheet:

TEST: Puts the device into IC test mode.
Must be tied to GND for normal operation, otherwise the device will appear to fail. 

In your schematic the TEST-pin is floating

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