FTDI Community

General Category => Discussion - Hardware => Topic started by: LoyalServant on April 02, 2018, 04:52:37 PM

Title: FT4232 as I2C Slave?
Post by: LoyalServant on April 02, 2018, 04:52:37 PM

Greetings all,

I have a unique application where I need to convert serial and I2C to USB.
It's an odd application where commands are sent over serial and data is received back via I2C. (I didn't design it!)
So, the I2C interface needs to be a slave. The MCU on the other end is the master.
I could certainly use a microcontroller for this but then I have to deal with USB, drivers, and other issues where this appears to be a more plug and play solution.
Then all I need to deal with is the software for the most part.

What I don't see is any information / API to configure the device as an I2C slave.
Is this supported on this device?

If not, any suggestions?
Thanks!

Title: Re: FT4232 as I2C Slave?
Post by: FTDI Community on April 03, 2018, 09:34:37 AM

Hello,

The FT4232H can only be an I2C Master unfortunately but our FT200XD or FT201X would be a good solution. Please find details below. The devices both offer the same USB-I2C functionality but differ in the IC package size and number of CBUS lines.

http://www.ftdichip.com/Products/ICs/FT200XD.html (http://www.ftdichip.com/Products/ICs/FT200XD.html)
http://www.ftdichip.com/Products/ICs/FT201X.html (http://www.ftdichip.com/Products/ICs/FT201X.html)

We also have development modules available which can be found at the bottom of these product pages above.

These devices are I2C peripherals and can be used via either VCP or D2xx applications on the PC side.  You would set the I2C address in the MTP memory in the chip using FT_Prog and can then have your Master perform I2C reads and writes to transfer the data.

Best Regards,
FTDI Community