WEBENCH® Tools/CC2640R2F: can this MCU be in Shutdown mode and initiate Bluetooth connection and establish connection.

pragash sangaran78

Part Number: CC2640R2F
Other Parts Discussed in Thread: BLE-STACK

Tool/software: WEBENCH® Design Tools

based on the datasheet,

"Bluetooth low energy requires a slow-speed clock with better than ±500 ppm accuracy if the device is to enter any sleep mode while maintaining a connection. The internal 32-kHz RC oscillator can in some use cases be compensated to meet the requirements. The low-speed crystal oscillator is designed for use with a 32-kHz watch-type crystal."

is that means MCU can be in shutdown mode but still initiate Bluetooth connection and establish the connection? based on the architecture, it looks like Main CPU, RF Core (Bluetooth), Peripherals and sensor controllers are separate modules inside this chip and can work independently of each other. correct me if I'm wrong.

over 6 years ago

0 J Lindh over 6 years ago

TI__Guru 57865 points

Hi,

You can not utilize/maintain Shutdown mode when in a connection as the BLE-Stack runs from the M3. Please refer to the datasheet and power modes?

0 pragash sangaran78 over 6 years ago in reply to J Lindh

Genius 3520 points

i don't see anything on the power mode. or maybe im not understanding correctly? attached the power modes here.

0 J Lindh over 6 years ago in reply to pragash sangaran78

TI__Guru 57865 points

You cannot create and maintain a connection with Shutdown mode as the RAM (among others) is Off. Shutdown mode will be entered if not future activities (HW/SW timers) are scheduled.

Typical runtime is running in Active/Idle and in-between processing/connection events resuming Standby for low power. Please see this app note:

http://www.ti.com/lit/swra478

Bluetooth®︎

Bluetooth forum

WEBENCH® Tools/CC2640R2F: can this MCU be in Shutdown mode and initiate Bluetooth connection and establish connection.