MSPM0L1305: UART-LIN wakeup state issue

There should be no noise or distortion on the signal which might be preventing the LIN slave from recognizing the wakeup signal. Proper bus termination is also a must.

Hi Zain,

Thank you so much for the reply, To terminate the bus what  produce should be followed

For the LIN idle state should be high, why do you use low to high to wake up the device?

In order to wake up, we need to transition from low to high

What's the clock source of LIN do you use and what's the low power mode do you use?

Hi Gary,

Thank you so much for the reply

In Active mode,the clock source is 32MHz and trimming the clock to 24 MHz, Therefore for LIN I am using 24 MHz

when I go to low power mode,I will disable the UART LIN 

In Low power mode clock source is 32KHz

when I transition from low to Active again,I will re-enable the UART LIN for 24 MHz

I am waiting for your reply

Still not sure what's the low power mode do you use.

By the way, you have change LIN's clock source to 32k when go into low power mode right? If the LIN is active in low power mode if the clock source is active.  You can try to communicate with it at 32k clock source and enable some interrupt to if it can response to the signals. 

santhosh prem said:

n order to wake up, we need to transition from low to high

I have not found such wakeup feature in MSPM0 device. 

But mspm0 do support waking up SYSOSC via an asynchronous fast clock request upon start bit detection when operating in low power modes, you can try just keep the LIN clock source to 32MHz(seems not work with 24MHz, due to the fast clock wakeup just can make the SYSOSC running at 32MHz) to do the test. For the low power mode you can try stop or standby mode.