UPSD3313D-40U6T datasheet(92/231 Pages) STMICROELECTRONICS

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uPSD33xx

92/231

IrDA INTERFACE

uPSD33xx devices provide an internal IrDA inter-

face that will allow the connection of the UART1

serial interface directly to an external infrared

transceiver device. The IrDA interface does this by

automatically shortening the pulses transmitted on

UART1’s TxD1 pin, and stretching the incoming

pulses received on the RxD1 pin. Reference Fig-

ures 36 and 37.

When the IrDA interface is enabled, the output sig-

nal from UART1’s transmitter logic on pin TxD1 is

compliant with the IrDA Physical Layer Link Spec-

ification v1.4 (www.irda.org) operating from 1.2k

bps up to 115.2k bps. The pulses received on the

RxD1 pin are stretched by the IrDA interface to be

recognized by UART1’s receiver logic, also adher-

ing to the IrDA specification up to 115.2k bps.

Note: In Figure 37 a logic '0' in the serial data

stream of a UART Frame corresponds to a logic

high pulse in an IR Frame. A logic '1' in a UART

Frame corresponds to no pulse in an IR Frame.

Figure 36. IrDA Interface

Figure 37. Pulse Shaping by the IrDA Interface

UART1

IrDA

Interface

TxD

RxD

uPSD33XX

IrDA

Transceiver

TxD1-IrDA

RxD1-IrDA

SIRClk

AI07851

Start

Bit

Stop

Bit

UART Frame

Data Bits

Bit Time

Pulse Width = 3/16 Bit Time

Start

Bit

Stop

Bit

UART Frame

IR Frame

Data Bits

AI09624

UPSD3313D-40U6T Datasheet(PDF) 92 Page - STMicroelectronics

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