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MSP430FR5739-EP: MSP430FR5739-EP: GPIO Issue at power On

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Part Number: MSP430FR5739-EP
Other Parts Discussed in Thread: MSP430FR5739

Tool/software:

I got a strange issue on a GPIO of MSP430FR5739. The occurence is 

This issue is only on a few µC over more than 300 tested.

We use P1.3, P1.2 and P2.4 for 3 digital sensor, with 3 external pullup.

The issue is when there is a power On in some case the P1.3 (only the P1.3, the P1.2 and P2.4 worked well) read 0 and the sensor output is 1 (we do the same without the sensor, and the P1.3 is still 0 but on the oscilloscope we saw a good 3.3V).

We create a new code, very simple with only the clock configuration with a while(1) { read 3 sensors} and the problem is still there.

 This issue is only seen at initial state, because when the sensor is in use (if it switch from 1 with the problem: read 0, then 0 read 0, then 1 it reads 1!) the GPIO will works correctly.

I saw only one case on a MSP430FR5659: 

https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/549717/msp430f5659-gpio-input-port-issue

with no answer.

I tried to put the GPIO on output low at init and then in input and it works.

Is it possible to a GPIO to be blocked at a powerup?

There is no problem on the PCB.

Regards


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