• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 79 subscribers
  • Views 260 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430F5510: After SYS16 occurs

rei
Mastermind 6155 points

Part Number: MSP430F5510

Hi,

Customers have questions about Erratasheet of MSP430F5510. SYS16

「Fast Vcc ramp after device power up may cause a reset」

 

It seems that SYS16 is occurring in the customer's application, so please let me check the following.

 

Question 1:

Is this an errata that BOR occurs many times? Or does it reset once and then the application works as usual?

 

Question 2:

If this errata causes reset, does user have to power down?

 

Question 3:

This occurs at dV/dT > 1V/100us. Is there a report of the number of occurrences and frequency? (ex 1/1000 times, 1/1000 chips)

 

Customers measured the lamp. I suggest to the customers to improve.

0 - 1.7V dV/dT:1.5V/100us

1.7V~ dV/dT:0.5V/100us

 

Regards, Rei

  • 0
    TI__Mastermind 26265 points

    Hi rei

    Question 1: Is this an errata that BOR occurs many times? Or does it reset once and then the application works as usual?

    Answer: 1 time. Reset happened.

    Question 2: If this errata causes reset, does user have to power down?

    Answer: power down is not must. but reset will happen in this case. reset will affect application.

    Question 3: This occurs at dV/dT > 1V/100us. Is there a report of the number of occurrences and frequency? (ex 1/1000 times, 1/1000 chips)

    Answer: I think this phenomenon can be repeated. when the PSS High Side Voltage (DVCC) is ramped up from 2V to 3V with ramp-rates higher than or equal to 100us, the PSS High side Brownout (BORHV) generates a faulty RESET which resets the entire chip

  • 0 in reply to Xiaodong LI
    Mastermind 6155 points

    Hi,

    Thank you for your reply. Sorry, I didn't understand much because use different words from DS and UG.

    Question: I understand the following about this errata. Is it correct?

    After exceeding the threshold V(SVSH_IT–), if the ramp rate is dV/dT> 1V/100us, POR will occur once. If the application has no effect even if POR occurs once, it can be operated continuously.

    Regards,

    Rei

  • 0 in reply to rei
    TI__Mastermind 26265 points

    Hi Rei

    Could you please comment where is the description in? I haven't found the description on MSP430F5510 DS or Errata

    "After exceeding the threshold V(SVSH_IT–), if the ramp rate is dV/dT> 1V/100us, POR will occur once. If the application has no effect even if POR occurs once, it can be operated continuously."

    Thanks!

  • 0 in reply to Xiaodong LI
    Mastermind 6155 points

    Hi Xiaodong,

    Thank you for your reply. This is my interpretation about SYS16. I want to know if this is correct.

    For example, SYS16 "This causes the device to undergo a reset."
    What kind of reset is this?(POR? BOR?)

    From the explanation "after Vcc crosses the brownout threshold",
    I interpreted that this Vcc is V(SVSH_IT–), and one POR occurs,
    and the application that can be reset once (ex. customer's app is USB HID), it doesn't matter.

    Sorry for the many questions. I want to know more about this errata.

    Regards,
    Rei

  • 0 in reply to rei
    TI__Mastermind 26265 points

    Hi Rei

    I checked the description and waveform in CDDS.

    The description is： when the PSS High Side Voltage (DVCC) is ramped up from 2V to 3V with ramp-rates higher than or equal to 100us, the PSS High side Brownout (BORHV) generates a faulty RESET which resets the entire chip。

    Please check my answer on your questions.

    Q: What kind of reset is this?(POR? BOR?)

    A: BOR

    Q: the application that can be reset once (ex. customer's app is USB HID), it doesn't matter.

    A: BOR happen ONE time after DVCC ramped up as the above condition. the application can be reset ONCE

**Attention** This is a public forum