TIDUEM8B March   2019  – February 2021

 

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2.2.7 TRS3232E

To properly interface with the RS-232 standard, a voltage translation system is required to convert between the 3.3-V domain on the board and from the 12 V on the port itself. To facilitate the translation, the design uses a TRS3232E device. The TRS3232E device is capable of driving the higher voltage signals on the RS-232 port from only the 3.3-V DVCC through a charge pump system.

The TRS3232E device consists of two line drivers, two line receivers, and a dual charge-pump circuit with ±15-kV 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 3-V to 5.5-V supply. The devices operate at data signaling rates up to 250 kbps and a maximum of 30-V/µs driver output slew rate.