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Are the I2C lines 5v tolerant?

Started by sivan_toledo January 19, 2007
The user manual states that the GPIO pins are 5v tolerant. Does this
also mean that the LPC2000 (2119 in my case) can communicate with 5v
I2C devices directly without a level shifter?

An Engineer's Guide to the LPC2100 Series

In short, yes.
The IIC lines are open drain so can be pulled up to 5V, and the lpc can
handle that 5V being present on the pins.
________________________________

From: l... [mailto:l...] On Behalf
Of sivan_toledo
Sent: Friday, 19 January 2007 4:28 PM
To: l...
Subject: [lpc2000] Are the I2C lines 5v tolerant?

The user manual states that the GPIO pins are 5v tolerant. Does
this
also mean that the LPC2000 (2119 in my case) can communicate
with 5v
I2C devices directly without a level shifter?
Thanks a lot. Sivan

--- In l..., "Bruce Paterson"
wrote:
>
> In short, yes.
> The IIC lines are open drain so can be pulled up to 5V, and the lpc can
> handle that 5V being present on the pins.
> ________________________________
>
> From: l... [mailto:l...] On Behalf
> Of sivan_toledo
> Sent: Friday, 19 January 2007 4:28 PM
> To: l...
> Subject: [lpc2000] Are the I2C lines 5v tolerant?
>
> The user manual states that the GPIO pins are 5v tolerant. Does
> this
> also mean that the LPC2000 (2119 in my case) can communicate
> with 5v
> I2C devices directly without a level shifter?
>
>
>
>
>
>
>