I2C pin DC specification in i.MX7D

[hiroshi_kimizuk]

Hi,

I tried to find the DC specification for the I2C pins through the "i.MX7Dual Family of Application Processors Datasheet (IMX7DCEC)" siince I need to fix the pull-up resistor value of the open-drain I2C port. However, there is no description abou this DC specification in this datasheet.

Could someone please tell me which document I should refer to.

One more thing, is it possible to configure the internal pull-up resistor for the I2C port which may apply the device tree option like a GPIO port ?

Thanks in advance and Best Regards,

KIMIZUKA

[weidong_sun]

Hi Hiroshi ,

   Let me take I2C in i.MX7D-SDB board as examples.

---From design files

From datasheet:

So pads max rating of I2C is 3.6V, and typical is 3.3V, 1.8V.

---From Reference Manual:

I2C1_SCL PAD control register: IOMUXC_SW_PAD_CTL_PAD_I2C1_SCL

So I2C1_SDA pad can  be pulled up / down.

I2C1_DAT PAD control register: IOMUXC_SW_PAD_CTL_PAD_I2C1_SDA

So I2C1_SDA pad can also be pulled up / down.

For other I2C pads, usages are the same as above.

Hope these information is helpful for you.

Have a nice day!
B.R,

Weidong