Datasheet

Loopback

RS-485 XCVR

UART

TSR

RSR

48SEN

RCVEN

DTR

RS-485 BUS

DEN

REN

Loopback

Receive Shift Register

IREN

Int_Tx Tx

Int_Rx Rx

IrDA Converter

Baud Clock

Reset

To Optoelectronic

LED

From

Optoelectronic

Pin Diode

RCVEN

Transmit Shift Register

TL16CP754C, TL16C754C

SLLS644G –DECEMBER 2007– REVISED MAY 2011

www.ti.com

Figure 23. RS-485 Application Example 1

Figure 24. RS-485 Application Example 2

IrDA Overview

Figure 25. IrDA Mode

The infrared data association (IrDA) defines several protocols for sending and receiving serial infrared data,

including rates of 115.2 kbps, 0.576 Mbps, 1.152 Mbps, and 4 Mbps. The low rate of 115.2 kbps was specified

first and the others must maintain downward compatibility with it. At the 115.2 kbps rate, the protocol

implemented in the hardware is fairly simple. It primarily defines a serial infrared data word to be surrounded by a

start bit equal to 0 and a stop bit equal to 1. Individual bits are encoded or decoded the same whether they are

start, data, or stop bits. The IrDA engine in the ’754C evaluate only single bits and only follow the 115.2 kbps