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Is this kind of I2C connection possible? [Solved]

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arunb

Joined: 08 Sep 2003
Posts: 492
Location: India

Is this kind of I2C connection possible? [Solved]
Posted: Mon Sep 30, 2013 1:39 pm

Hi, I am trying to use a 18F2620 for i2c connection, I intend to run the 18F2620 on 5 VDC but the i2c pins would be pulled up to 3.3V. My question is will the 18F2620 drive the SCL and SDA pins to 5 VDC ?? or will the voltage level remain at 3.3V ?? thanks a

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Mon Sep 30, 2013 1:49 pm

Reply with quote

Quote:

I intend to run the 18F2620 on 5 VDC but the i2c pins would be pulled up to 3.3V.

That PIC has the SMBus option for the hardware i2c pins. Enable it.
Add SMBUS to the #use i2c() statement. Then it will work with 3.3v pull-ups.

Quote:

My question is will the 18F2620 drive the SCL and SDA pins to 5 VDC

I2c doesn't drive high levels. That's what the pull-ups are for.
It only pulls down (drives low).

arunb

Joined: 08 Sep 2003
Posts: 492
Location: India

re
Posted: Tue Oct 01, 2013 1:00 pm

thanks for the help, its working now thanks a

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