MSP430FR5887: The ESI module operates at low temperatures.

Hi,

Can you first check in the debug mode to see what happens to the MCU with the instruction bellow? Then we will know why it stops.

 2766.Connect MCU in free run mode.docx

Eason

We have the interruption output when the inductor is sensed by the metal plate. Some inductors do not trigger the interruption when the temperature is low enough. This register ESIDEBUG2_L is used.

Hi,

Refer to this e2e: https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/783318/msp430fr5989-esi---ms430fr5989, it seems that the ESI should not influence the peformance with low temperature and no customer meet the same problem as you.Can you also measure the singal.

Please refer to the PMM24 in this Errata (https://www.ti.com/lit/er/slaz624aa/slaz624aa.pdf). I would suggest you first to remove the usage of LPM mode and double check again.

Currently, our ESI expert is left TI. For this application, we only have limited support now.

Eason

I can't access either of these two links. Do you have any screenshots?

Add the right link: https://www.ti.com/lit/pdf/slaz624

e2e.ti.com/.../msp430fr5989-esi---ms430fr5989

The above article only mentioned temperatures ranging from 0 to 50 degrees, but did not cover the situation at lower temperatures.

Please see this one for the temperature comment.

That I want you to measure the wave is to make sure whether the code is still working. If you meet PMM24, you may see the same result.

The code is still functioning, but in low temperatures, one of the three inductors will not sense metal at all, while the other will intermittently sense metal. If I calibrate under low temperatures, I can definitely sense the metal in a low-temperature environment.

Understand the result. I am not sure if it is possible to use the internal termperature sensor to measure the temperature and then load the related calibration result?