USB FT232

[emmanuel]

Hello,

I'm using the usb FT232 in VCCIO 1.8V mode . But I need to add a
resistor between VCCIO and GND to have a VCCIO <= 1.8V.

When I'm measuring Vccio without the resistor I'm having
VCCIO=2.4V ....

Anybody can explain to me the reason ?
Thank's Emmanuel

You can find the data here : http://esaid.free.fr/ft232/FT232.htm

 

[Tom Biasi]

On Tue, 24 Jan 2012 12:59:28 -0800 (PST), emmanuel
<emmanuel.said@cern.ch> wrote:

Hello,

I'm using the usb FT232 in VCCIO 1.8V mode . But I need to add a
resistor between VCCIO and GND to have a VCCIO <= 1.8V.

When I'm measuring Vccio without the resistor I'm having
VCCIO=2.4V ....

Anybody can explain to me the reason ?
Thank's Emmanuel

You can find the data here : http://esaid.free.fr/ft232/FT232.htm

The link is in French and my French is not that good but it look like
that's the way it's supposed to work.
For 2.4 volts leave the resistor out, for 1.8 volts put a 1K resistor
from vccio to gnd.