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VBAT connection on TM4C1294NCPDT

Nomo
Guru 16800 points
Other Parts Discussed in Thread: EK-TM4C1294XL, TM4C1294NCPDT

Hello,

On EK-TM4C1294XL, R38 and C3 are used to meet VBAT rise time requirements.
In case the hibernation mode isn't operated on my customer's system, can R38 and C3 be removed?

Best Regards,

Nomoto

  • 0
    Guru 47900 points

    Yet - what if that use-case changes - and you've "pulled" both of those components?

    I'd suspect that the "safety & flexibility" which those components provide argues against their discard.   Unless sales volume is so very high - the cost/size benefits of their removal - especially when weighed under, "Risk-Reward" may not work to client's advantage.

    A good compromise is to provide the component, "foot prints" upon your pcb - and perhaps "selectively" fill.   In this manner you "accommodate any future need/change" - yet (save) their slight cost - while maximizing design flexibility.  

  • 0
    TI__Guru**** 244400 points
    Hello Nomoto,

    The R38 and C3 are meant for protecting the rise time voltage damage. So even if the customer does not require it, it would be still good to put the RC to ensure that the pin damage does not occur.

    Regards
    Amit
  • 0
    Prodigy 250 points
    hi
    even i have sane board but can u yell me which pin is to connect with positive supply of external battry,it has mentioned that pin 68 is for vbat pin.but pin 68 shows "PF1 pin".Now can u tell me how to connect this launch board with"Cr2032 cmos abttry" make it soon
  • 0 in reply to Rahul Kumar38
    TI__Guru**** 244400 points
    Hello Rahul,

    Pin 68 is the VBAT pin on the TM4C1294NCPDT. Which document shows that pin 68 is PF1?

    Regards
    Amit