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CC3220S: CC3220S lose power restart

felix fu
Prodigy 70 points
Part Number: CC3220S

Hi TI:

I need your help with the problem of CC3220S restart: 

The following is the block diagram. The input power of CC3220S is 3.3V_AUX; Power switch on when CC3220S outputs MV_EN signal.

The 3.3V_AUX will drop and the reson is caused by the in-rush current at the load startup. you can see the the waveform that the 3.3V_AUX drop to 2.0V and the pulse width is about 150us.

 

According to the data manual of CC3220S, the minimum working voltage of CC3220S is 2.1V, but we can not see the CC3220S restart.

We trying to catch the CC3220S power off and restart.  reduce the input voltage of CC3220S to 2.4V so that the drop reaches to 1.64V, CC3220S power off and restart. and the log from CC3220S show "Reset reason: PRCM_POWER_ON" .   you can see the below waveform.

 

So my question is:

1, What is the probability that such a power drop( about 2V)  will cause the CC3220S to lose power and restart ? 

2, We are doing a lot of repeated power on-off experiments and found the reboot caused by "Reset reason: PRCM_HIB_EXIT" from the log of CC3220S. Is there any connection between this information(Reset reason: PRCM_HIB_EXIT) and restart caused by CC3220S power drop ?

Looking forward to your answer, thank you!

 

  • 0
    Guru 79985 points

    Hi,

    Please see datasheet at chapter 5.8. There are descibed Brownout and Blackout Conditions.

    Jan

  • 0 in reply to Jan D
    Prodigy 70 points

    Hi Jan，

    Thanks for your replay！

    Yes, i read the datasheet at chapter 5.8

    First drop the voltage below 2.1V but under 1.67V， then CC3220S will enter Hibernate mode；Then the voltage drops below 1.67V (second drop），the chip will be reset and reboot.  In other word, when i see the log from CC3220S "Reset reason: PRCM_HIB_EXIT"  It means that the cause is the CC3220S voltage drop. Is my understanding correct ? please give more information. thanks!

  • 0 in reply to felix fu
    Guru 79985 points

    Hi,

    Yes, it may to be that reason.

    At the chapter 5.4 my to be interesting for you this two notes:

    (3) To ensure WLAN performance, ripple on the supply must be less than ±300 mV.
    (4) The minimum voltage specified includes the ripple on the supply voltage and all other transient dips. The brownout condition is also 2.1V, and care must be taken when operating at the minimum specified voltage.

    Jan