Pull down SDA pin i2c

[Hkhan7861]

Good day

I am developing on the nrf9160dk with a tag reader using i2c and am wanting to know if there is a function to pull down the SDA or SCL pins during operation in order to wake up the slave device.

Thank you in advance.

Kind regards,

Hassan

[Hkhan7861]

Hi, thank you for the reply. This is the extent of what the documentation states.  Thank you !

6.1.1 Start condition Start is identified by a falling edge of serial data (SDA) while the serial clock (SCL) is stable in the high state. A Start condition must precede any data transfer command. The device continuously monitors (except during a write cycle) the SDA and the SCL for a Start condition, and does not respond unless one is given.

www.st.com/.../st25dv04k.pdf

[Hkhan7861]

HI, do you mind sending the name or a link to that function so I may see how it works.  I can't seem to find it

Yes, I have used instruments to test and have found that by using an internal pull-up resister, the pin signal level doesnt drop enough.

[Vidar Berg]

The transaction is handled in HW, and not in SW.  Please see the "Master write sequence" section of the TWIM chapter for more details on how this works.

Hkhan7861 said:

Yes, I have used instruments to test and have found that by using an internal pull-up resister, the pin signal level doesnt drop enough.

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Can you post a picture of this?