1 Introduction
The TRS3221RGTEVM is an evaluation module for the TRS3221RGT and TRSF3221RGT devices, normal and
high-speed RS-232 transceivers.
Features
• Interface with MCUs or processor from 3 V up to 5.5 V
• High-speed RS-232 communication, up to 1 Mbps
• Robust IEC 61000-4-2 qualification provides robust protection from electrostatic discharge events
• DB9 female connector for direct connection with a computer's RS-232 port
• Headers for easy connection to all power and logic signals
Applications
Any application that needs short range point-to-point full duplex data communications with hardware flow control.
• Remote Radio Unit (RRU)
• Base Band Unit (BBU)
• Electronic Point of Sale (EPOS)
• Diagnostics & Data Transmission Battery-Powered Equipment
Description
The TRS3221RGTEVM is an evaluation module for the TRS3221RGT and TRSF3221RGT devices, normal and
high-speed RS-232 transceivers. The module enables device evaluation using the installed DB9 connector and
headers. The board interfaces data and controls TTL logic levels on the headers to RS-232 levels supporting
data [RX, TX] channels on the DB9 connector. The EVM has pull up resistors on the device’s FORCEOFF and
FORCEON pins and pull down resistor on the EN pin to keep both driver and receiver active. If desired, these
signal can be driven by the external system to fully control all the features of auto-power down plus circuitry. The
system may also benefit from monitoring the INVALID output to detect if an active connection has been made to
the RS-232 port.
Introduction
2
TRS3221 EVM User's Guide
SLLU328 – DECEMBER 2020
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