Power saving mode

[FACE@shibuya]

I want to know the power saving mode of nRF5340.
Dose this chip set have the following mode ?
1. each BT products connencts, however, the data were not send.
above condition, 
BT chip set  move the Sleep mode to save the power at conection. 
BT chip set  sometimes wake up, and check the data available or not. 
I want to know whether the chip set can do such as above?
The chip set recognize the data available or not?

[Einar Thorsrud]

Hi,

The nRF5340 (like the other nRF5) devies suppot several power modes. The most typical low power mode is system ON idle, and this is typically used in Bluetooth application whenever nothign is happening. With that, the system goes ot sleep and wakes up on the next Bluetooht event (a connection event, advertising event or similar). Bluetooth is designed for this operation, where the devices wake up at agreed times to communicate, and then go back to sleep.

[FACE@shibuya]

Thank you for your comments.

I have a question for your connent.
you mentions that idol mode is power on when nothing is happening.
In case that  the syetem is connecting with other BT device, howver,  the data of communication, other is not  avaiable for while, Does the system  become to idole mode ?
 Can the BT product keep the connection at idole mode? 


best regards,
T. Shibuya

[Einar Thorsrud]

Hi,

FACE@shibuya said:

, howver,  the data of communication, other is not  avaiable for while, Does the system  become to idole mode ?

All Bluetooth exmaples we have enter system on idle (CPU sleeping) whenever there is no work to be done, and the system wakes up when there is wokr to do. Wiht Bleutooth, it is handled aubomatically. For your own tasks, you may need tos chedule it, but that is something all application does and it is handled very well. In nRF Connect SDK, this is handled by the Zephyr RTOS which automatically enters sleel in the idle thread.

FACE@shibuya said:

 Can the BT product keep the connection at idole mode? 

Yes

[FACE@shibuya]

Thank you for your answer.

 

Your chipset has some power mode.

Especially, I want to confirm the idol mode(Sleep mode.)

Idol mode is that CPU core is sleeping, and RF-core is active.

Idol mode automatically move by RTOS.

For example,

Our product is the transceiver.

Each device connects by BT LE Audio.

When we are talking with each device, each device is active mode.

when stop talking still connection, the device moves to idol mode (Sleep mode) automatically with keeping the connection.

 

Is my understanding correct ?

To wake up from idol mode to other mode, need such as interrupt event, timer.

Is it right ?

 

I think that your chipset has also the deep sleep mode sleeping the CPU-Core and RF-Core.

 

 

If In my understanding is correct, I want to verify the answer.

 Best  regards,

T.Shibuya

[Einar Thorsrud]

FACE@shibuya said:

automatically with keeping the connection.

Yes, this is how bluetooth LE works in general, also in our implementation.

FACE@shibuya said:

To wake up from idol mode to other mode, need such as interrupt event, timer.

Is it right ?

Yes. And if this is for anythign Bluetooth related, it is automatically andled by the Bluetooth stack. The Zephry RTOS use an RTC (low power low frequency timer) on the nRF device to keep trak of time and wake up at defined times.

FACE@shibuya said:

I think that your chipset has also the deep sleep mode sleeping the CPU-Core and RF-Core.

 

 

If In my understanding is correct, I want to verify the answer.

Yes, the radio and applicaiton core are separate and can sleep independetly.