Pull up resistors

[RADHIKA RAINA]

I am getting more current consumption when internal pull up resistors of nRF52832 are disabled and external pull up resistors of the slave sensor are enabled as compared with internal pull up resistors are enabled and external pull up resistors are disabled.

What is the reason that less current consumption is achieved when external pull ups are disabled and internal pull ups are enabled?

[Priyanka]

Hi Radhika,

I am sorry, but you have conflicting statements in your query. Do you get more current consumption when the internal is enabled or vice versa?

Generally, for GPIOs, using external resistors compared to internal pull up can result in lower power consumption, depending upon the resistors used. Because, if the internal resistance is low and the voltage is around 5V, then the current consumption can be high compared to the external, where you can control the resistor value accordingly. But in case you have applications requiring low resistance value for the external pull ups, then it would be best to use the internal pull up.

So it depends on your requirements.

Regards,

Priyanka

[RADHIKA RAINA]

Can internal pull ups in the code can be enabled or disabled? If yes, then how it can be achieved?

[Priyanka]

You could refer to the GPIO documentation (Zephyr) and also in the drivers. There are similar ones for the SAADC and the USBD as well.

-Priyanka