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Author Topic: FT232rl won't register with my pc - easy way to check if it's dead  (Read 3249 times)

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Offline amateur_25Topic starter

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FT232rl won't register with my pc - easy way to check if it's dead
« on: November 14, 2011, 05:53:28 pm »
Hi
I'm having problems with my ft232rl which was at least recognised by my pc. I moved the txd and rxd because I swapped them around on the arduino side by accident.
As well some tidying up of wires. Now it won't even be detected by my pc. I have checked I ground everything inc the test pin.

I'm wondering if there is an easy way of checking if I've killed the chip? As far as I can tell it's fine because the 3.3v out is delivering 3.3volts. Is there a way I can use my scope to see if it's
oscillating? I didn't get anything on pin 28 or 27.

I'm using the self powered design I got from the datasheet. 4.7K (top resistor) 10K (bottom)
« Last Edit: November 14, 2011, 05:55:37 pm by amateur_25 »
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Offline rf-loop

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Re: FT232rl won't register with my pc - easy way to check if it's dead
« Reply #1 on: November 14, 2011, 06:52:43 pm »
Typically AGND (pin25) is also connected to GND.
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Offline amateur_25Topic starter

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Re: FT232rl won't register with my pc - easy way to check if it's dead
« Reply #2 on: November 14, 2011, 08:50:48 pm »
I've done that aswell oh well. So there really isn't an easy way to test if it's dead?
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Offline ivan747

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Re: FT232rl won't register with my pc - easy way to check if it's dead
« Reply #3 on: November 15, 2011, 02:32:15 am »
Quote from: amateur_25 on November 14, 2011, 08:50:48 pm
I've done that aswell oh well. So there really isn't an easy way to test if it's dead?

What is the test pin for? I am not being sarcastic here.
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Offline Mechatrommer

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Re: FT232rl won't register with my pc - easy way to check if it's dead
« Reply #4 on: November 15, 2011, 05:02:12 am »
if you dont have proper tool. get a fresh new chip, try install it carefully, and compare how it works with the CUT (chip under test).
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Offline amateur_25Topic starter

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Re: FT232rl won't register with my pc - easy way to check if it's dead
« Reply #5 on: November 15, 2011, 11:55:29 am »
I assumed I can't use that pin since I couldn't find any references to it other than it must be tied to gnd.
So what do I need to test the chip then?
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