amateur_24
Member
Hi
I have two tries at soldering the FT232rl. Both tries have failed misserably. I suspect they both failed because I managed to latch them up.
Last time I had a short between the supply rails however this time it was between 3.3v and D- (usb). I get a 5v between gnd and 3.3v pin. The shorts were identified whilest the chip wasn't powered on.
I have now purchased a 10x loupe but can't find any solder bridges. I have cleaned away any flux residue.
The chip is self powered using 7805CV regulator. According to the datasheet when the chip is used in self powered mode, you connect a voltage divider to the reset pin. This is to supply the usb transceiver/ pull up 3.3v. The divider is powered by usb bus.
Wikipedia says that using multiple supplies that don't come on in the right order can cause latch ups. I was wondering is this what I'm doing wrong? Would it be easier to just leave it as powered by the usb bus (default).
I know there's a 4 second rule when soldering. If you do go over 4seconds could that cause a latch up?
I have two tries at soldering the FT232rl. Both tries have failed misserably. I suspect they both failed because I managed to latch them up.
Last time I had a short between the supply rails however this time it was between 3.3v and D- (usb). I get a 5v between gnd and 3.3v pin. The shorts were identified whilest the chip wasn't powered on.
I have now purchased a 10x loupe but can't find any solder bridges. I have cleaned away any flux residue.
The chip is self powered using 7805CV regulator. According to the datasheet when the chip is used in self powered mode, you connect a voltage divider to the reset pin. This is to supply the usb transceiver/ pull up 3.3v. The divider is powered by usb bus.
Wikipedia says that using multiple supplies that don't come on in the right order can cause latch ups. I was wondering is this what I'm doing wrong? Would it be easier to just leave it as powered by the usb bus (default).
I know there's a 4 second rule when soldering. If you do go over 4seconds could that cause a latch up?
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