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Smart Bluetooth

Anonymous
Not applicable

Hi,

I'm currently trying to reduce power consumption during sleep mode. The current during sleep is now ~40uA which is a little too high

to satisfy our initial requirement of 20uA. With a simpler application I achieved around 30uA which would help us.

I noticed that I can set the GPIO pins that we use to drive LEDs as input with a pull down to achieve relatively low currents compared to leaving them floating.

We also have a number of unconnected pins that I leave unconfigured for now, I would like to know the default configuration of those.

Notice that I'm using gpio_configurePin() instead of whatever is provided with bleprofile_GPIOInit(). Do I have to configure them in any specific way?

Is there any action I should take to configure the GPIO pins before allowing the sleep modus? I would assume setting them as inputs or to 0V would help, but I guess you have some guidelines for this event already.

Would using GPIO_GLOBAL_INPUT_DISABLE help me in anyway? I couldn't find any example code but it sounds interesting.

I'm pretty sure somebody asked this before but I couldn't find any good info with the search engine.

Regards,

Kilian

1 Solution
ArvindS_76
Employee

> Would using GPIO_GLOBAL_INPUT_DISABLE help me in anyway?

This will high-z all GPIOs, so I don't think you want to do this.


> We also have a number of unconnected pins that I leave unconfigured for now, I would like to know the default configuration of those.

The default configuration of all GPIOs when coming out of power-on-reset is input enable. GPIOs that are not configured (either using BLE_PROFILE_GPIO_CFG or gpio_*) will be input/output disabled before application create is invoked.


> Is there any action I should take to configure the GPIO pins before allowing the sleep modus?

No, nothing needs to be configured. Input enabled with a pull-down is safe, though if something external to the chip is driving this input, then your system current will go up.

View solution in original post

2 Replies
MichaelF_56
Moderator
Moderator

Refer to the mybeacon example in SDK 2.0 as a reference on how to bring up the part with a minimal configuration.

0 Likes
ArvindS_76
Employee

> Would using GPIO_GLOBAL_INPUT_DISABLE help me in anyway?

This will high-z all GPIOs, so I don't think you want to do this.


> We also have a number of unconnected pins that I leave unconfigured for now, I would like to know the default configuration of those.

The default configuration of all GPIOs when coming out of power-on-reset is input enable. GPIOs that are not configured (either using BLE_PROFILE_GPIO_CFG or gpio_*) will be input/output disabled before application create is invoked.


> Is there any action I should take to configure the GPIO pins before allowing the sleep modus?

No, nothing needs to be configured. Input enabled with a pull-down is safe, though if something external to the chip is driving this input, then your system current will go up.

View solution in original post