RTC Running in System ON Mode Current Consumption?

[starkAbhi]

hi,

i am using nrf connect extension in vs code with Zephyr os version v3.2.99-ncs2 , 

when device in system on sleep how much current consume by nrf52833 development kit ? when only RTC Being on.

1. during sleep, RTC  current consumption?

2. what is complete current consumption flow(rtc,idle thread and LFRC) during system on sleep? 

pm_state_force(0u, &(struct pm_state_info){PM_STATE_SUSPEND_TO_IDLE, 0, 0}); //nrfonly switch 

[Karl Ylvisaker]

Hello,

For information about the power consumption in these different scenarios please take a look at the Electrical Specification in the Product Specification.

Best regards,
Karl

[starkAbhi]

hi,

i have read the electrical specification. i want to know during system in sleep. in which nrf52833 dk consume only 2.2 uA. so which peripheral are on in the sleep. rtc+lfrtc+ram retention = 2.2uA?? or how can i lower the current consumption in sleep. less than 2uA like 1.6uA something?

[Edvin]

Hello,

Karl is out of office, so I am sorry for the late reply. 

I don't know what current consumption you currently are looking at, but you can check what my colleague answered in a similar question yesterday, regarding how to control the RAM retention.

It also holds the table containing current consumption in different states.

Best regards,

Edvin

[starkAbhi]

Hi Edvin,

Edvin said:

I don't know what current consumption you currently are looking at, but you can check what my colleague answered in a similar question yesterday, regarding how to control the RAM retention.

My application requirement is to advertise data then go to  sleep periodically . it has to consume  ~1.2uA current in sleep. due to less power consumption connected battery has long life. we able to achieve 2.2 uA  in sleep by using given code above. how to decrease the current consumption more to close 1uA.

previously "Karl' asked about hardware design. in response we are open to suggestions. could you please us in hardware design?

Regards Abhishek

[Edvin]

Hello Abhishek,

For HW review, please create a new ticket where you include the schematics and layout files, and request a HW review. You can also mention that you are looking to reduce the current consumption so that they know what to look for. 

I can only see some snippets from your application, so I don't know what is enabled or not, and what you have connected to your board. Do you use any external devices powered by the nRF? Sensors? And did you disable the UART logging, e.g. by setting CONFIG_SERIAL=n in your prj.conf?

BR,
Edvin

[Edvin]

And regarding your measured current consumption. Based on your comment, I believe I understand it correctly, but the 2.2µA is the current while you are in sleep, right? So it is not an average while you are advertising as well?

BR,
Edvin

[starkAbhi]

Hi Edvin,

Edvin said:

For HW review, please create a new ticket where you include the schematics and layout files, and request a HW review. You can also mention that you are looking to reduce the current consumption so that they know what to look for. 

okay, i will create another ticket.

Edvin said:

I can only see some snippets from your application, so I don't know what is enabled or not, and what you have connected to your board. Do you use any external devices powered by the nRF? Sensors? And did you disable the UART logging, e.g. by setting CONFIG_SERIAL=n in your prj.conf?

all peripherals are disabled. only i am using ble for advertisement. currently i am using nrf52833 dk . yes, i disabled the uart logging.

Regards Abhishek Tiwari

[Edvin]

Hello,

starkAbhi said:

okay, i will create another ticket.

Sounds good.

starkAbhi said:

all peripherals are disabled.

Just one thing that you can look for. Let us say that you are using SPI at some point in your application. (This advice goes for all peripherals) Compare the current consumption after you disable the SPI to before you initialized it (or compare it to a version of your application where you don't enable it), to make sure that it is properly turned off. 

Best regards,

Edvin

[starkAbhi]

Hi Edvin,

Edvin said:

Just one thing that you can look for. Let us say that you are using SPI at some point in your application. (This advice goes for all peripherals) Compare the current consumption after you disable the SPI to before you initialized it (or compare it to a version of your application where you don't enable it), to make sure that it is properly turned off. 

i will definitely check this out. thanks for your suggestions.

Regards

Abhishek