TIDUF72 August 2024
To properly interface with the RS-232 standard, a voltage translation system is required to convert between the 3.3V domain on the board and from the 12V on the port. To facilitate the translation, the design uses a TRS3232E device, which is capable of driving the higher voltage signals on the RS-232 port from only the 3.3V DVCC through a charge pump system.
The TRS3232E device consists of two line drivers, two line receivers, and a dual charge-pump circuit with ±15kV electrostatic discharge (ESD) protection pin-to-pin (serial-port connection pins, including GND). The device meets the requirements of the Telecommunications Industry Association and Electronic Industries Alliance TIA/ EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3V to 5.5V supply. The devices operate at data signaling rates up to 250kbps and a maximum of 30V/µs driver output slew rate.