Pull down SDA pin i2c

Question

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

Vidar Berg · Accepted Answer

It seems like you don't have external pull-ups on the SDA and SCL lines as you measure 0 V on both . In that case, you will need to enable the internal pull-up resistors by adding the bias-pull-up property to your pin assignment in the device tree. &pinctrl { i2c2_default: i2c2_default { group1 { psels = , ; bias-pull-up; }; }; i2c2_sleep: i2c2_sleep { group1 { psels = , ; low-power-enable; }; }; };

Pull down SDA pin i2c

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