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Evaluation Module Overview
1 Evaluation Module Overview
1.1 Introduction
This document is the evaluation module user's guide for the THVD4411EVM, which provides a quick way to
evaluate TI's THVD4411. The THVD4411 is among TI's first RS-485 and RS-232 multiprotocol transceivers.
This configuration allows for 1T1R RS-232 communication, half duplex RS-485 communication, and full duplex
RS-485 communication.
1.2 Kit Contents
(1) THVD4411EVM with the THVD4411RGE pre-installed ready to operate directly out of box.
1.3 Specification
Refer to THVD4411 data sheet (SLLSFR9) for most to up to date specification for device.
A selection of common usage ranges for devices considered in the construction of the board are shown below.
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VCC input (at J1) is expected to be between 3V and 5.5V for compatible devices.
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VIO input (at J2) is expected to be between 1.65V and 5.5V for compatible devices.
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Signal inputs at J5 and J6 are expected to be between 0V and VIO.
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The device on-board does not generate voltages above VCC alone.
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Each board is equipped with a 120 Ohm termination resistor Pad on each differential bus for RS-485 usage.
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Voltage inputs for common mode signals R1-R4 must remain in the range -7V to 12V.
1.4 Device Information
The THVD4411 is a highly integrated and robust multiprotocol transceiver supporting RS-232, RS-422 and
RS-485 physical layers. The device has one transmitter and one receiver to enable 1T1R RS-232 port. The
device also integrates one transmitter and one receiver to enable half and full duplex RS-485 port. MODE
selection pins enable shared bus and logic pins for the protocols to share a common single connector. Integrated
termination for RS-485 bus pins and for RS-232 receiver inputs verify no external components are needed to
realize a fully-functional communication port. These devices have slew rate select feature that enables them
to be used at two maximum speeds based on the SLR pin setting. These devices feature integrated Level
4 IEC ESD protection, eliminating the need for external system-level protection components. In addition, the
RS-485 receiver fail-safe feature drives logic high on received logic output when the bus inputs are open or
shorted together or when the bus is idle. Shutdown mode consumes ultra-low current (10µA typical), which
is good for power-sensitive applications. The device needs 3V to 5.5V supply that powers the charge pump
for RS-232, drivers, and receivers for both RS-232 and RS-485. A separate logic supply VIO (1.65V to 5.5V)
enables interface with low-level microcontrollers.
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THVD4411 Evaluation Module
Copyright © 2024 Texas Instruments Incorporated
www.ti.com
SLLU380 – MARCH 2024
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