iMXRT1060 On/Off power sequence

[EmbeddedTech]

Hi,

We have a requirement to complete few sequences like writing to flash before the MCU is turned off using the power button connected to the ONOFF pin of MCU. long press of power button for 5 secs or more shuts down the MCU. Is it possible to achieve the power mode functionality with ONOFF pin or should we use a GPIO to control the power modes?

Thanks.

[Sam_Gao]

@EmbeddedTech 

Yes, it is possible to achieve the dedicated functions as you mentioned. 

1. https://www.nxp.com.cn/docs/en/nxp/data-sheets/IMXRT1060IEC.pdf The DS shows ONOFF can be configured in debounce, off to on time, and max time-out configurations.

2. Please check 'power mode switch ' example, as well as https://www.nxp.com.cn/docs/en/application-note/AN12085.pdf to find how to use.

[EmbeddedTech]

Hi @Sam_Gao,

Currently our power button is tied to ONOFF pin of MCU directly. We do not use any GPIO to control the ON/OFF sequence. When power button is pressed for 5 secs it shuts down the MCU. How to perform the shutdown sequence in the software like finishing any pending flash writes etc. before the MCU shuts down. I see in the power mode switch example that GPIO pin is used. Thanks for your help in advance.

[Sam_Gao]

@EmbeddedTech 

Hi,

The ONOFF PIN doesn't support this kind of requirment based on its hardware, please implement the feature from software side by yourself.

[EmbeddedTech]

Hi @Sam_Gao ,
How should the power button be connected to the MCU in order to use the power mode switch example?

Thanks for your help.

[Sam_Gao]

Hi,

If there is no any other GPIO except ON/OFF PIn to connect MCU, it seems no any solution to get what the status is. 

About 'power mode switch', here is an example where the user can set the MCU to a specific power mode, User can wakeup the core by key interrupt (SW7, Reset or Power off).  I am not sure if it can help you for the dedicated requirment.