• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 32 subscribers
  • Views 198 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.

TRS3232E: V+ pin question

Luke Sun
Intellectual 1830 points
Part Number: TRS3232E

Hi team,

My customer is asking what's the usage of V+/V- pin. What'll be the potential voltage on these two pins?

Should it be better to connect the corresponding capacitor to GND or VDD for these two pins?

THank you!

  • 0
    TI__Guru 62910 points
    Hi Luke,

    The V+ and V- signals are the higher-voltage positive and negative rails that are generated by the RS-232 transceiver's charge pump circuitry. Since TRS3232E uses a four-capacitor charge pump, the maximum voltage on the V+/V- pins would be 2*VCC and -2*VCC, respectively.

    I would recommend connecting the V- pin capacitor to ground so that the voltage difference across it is smaller. The V+ cap can connect to either VCC or ground, and there won't be much of a different in performance between the two (the cap is just used to store charge and reduce the output ripple).

    You can read more about how charge pumps in RS-232 transceivers work via this blog:

    e2e.ti.com/.../how-the-rs-232-transceiver-s-regulated-charge-pump-circuitry-works

    Please let me know if you have any other questions.

    Regards,
    Max