• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 16 subscribers
  • Views 738 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.

CC1110 CC2510 Low-Voltage operation

JoWi
Prodigy 120 points


Hi,

we want to use the CCxx10 wit Alkaline Batteries (2 x 1.5V). These Batteries have a constantly decreasing voltage, quite linear, from new 3.1V to low 2V.

The datasheet says"12.4.3 Low I/O Supply Voltage - In applications where the digital I/O power supply voltage VDD on pin DVDD is below 2.6 V, the register bit IOCFG1.GDO_DS should be set to 1."

How important is it, to set IOCFG1.GDO_DS to the correct opertaion voltage? Will it cause problems, if IOCFG1.GDO_DS is set generally, even for DVDD>2.6V?

Thanks for your assistance, Jo (from Germany)

  • 0
    TI__Genius 17270 points

    Hi,

    If one sets the register to 0 and have low supply voltage the transition times will increase, and the maximum driving capabilities is generally reduced. And if the register is set to 1 and supply voltage is high, the transitions can become so fast that ringing on the line can be an issue.

    Depending on what the IO pins are driving and what timing requirements exist always having 0 or always having 1 can work. It really has to be evaluated on a design by design basis. If the pin load is large, then the high drive option might be recommended always. If the pin load is small and/or timing requirements are modest then the low drive option can be used.

    An alternative is to monitor the supply voltage and set the bit accordingly, but this is of course more complex.

    BR,

    -M.

  • 0 in reply to Mizanur Chowdhury
    Prodigy 120 points

    Hi M,

    thanks for your reply.

    With kind regards, Jo