• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 16 subscribers
  • Views 282 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TMUX1111: TMUX1111 for battery voltage monitoring

Kazuki Itoh
Genius 9595 points
Part Number: TMUX1111
Other Parts Discussed in Thread: TMUX1511

Hi team,

My customer wants to monitor battery voltages via TMUX1111.

When VCC = 3.3V is off, my customer wants to turn off the all switches and protect the MCU A/D ports from the battery voltage.

In this case, should VCC be connected to SEL* and VDD?

Is TMUX1111 leakage negligible when VDD and VSEL = 0V?

Regards,

Itoh

  • 0
    TI__Expert 3900 points

    Hello Itoh-san,

    You mention when VCC =3.3V is off, customer wants all switches turned off.

    Is 3.3V the supply voltage for multiplexer? 

    If you would like to have a voltage present at the signal pins of switch when the supply voltage is 0V, this feature is called powered-off protection. You can read more about this feature in this tech-note. The TMUX1111 does not have this feature - but the TMUX1511 does have powered-off protection and would be a good recommendation for this circuit.

    If customer will always have a supply voltage present on the VCC of TMUX1111 - this is a good device.

    Please help provide a diagram of you use-case if this answer is not clear and we can provide more clarification.

  • 0 in reply to Dakotah
    TI__Genius 9595 points

    Hello Dakotah-san,

    Yes, it is 3.3V for the MUX.

    But the customer does NOT want 3.3V present when supply voltage is 0V. 

    I understand that the TMUX1511 the right choice here.

    Appreciate your help!.

    Regards,

    Itoh