TFBS4652

Vishay Semiconductors

Infrared Transceiver, 9.6 kbit/s to

115.2 kbit/s (SIR)

www.vishay.com

For technical questions within your region, please contact one of the following:

Document Number: 84671

2

Rev. 1.3, 17-Sep-09

FUNCTIONAL BLOCK DIAGRAM

PINOUT

TFBS4652, bottom view

weight 0.05 g

Definitions:

In

the

Vishay

transceiver

datasheets

the

following

nomenclature is used for defining the IrDA operating modes:

SIR: 2.4 kbit/s to 115.2 kbit/s, equivalent to the basic serial

infrared standard with the physical layer version IrPhy 1.0

MIR: 576 kbit/s to 1152 kbit/s

FIR: 4 Mbit/s

VFIR: 16 Mbit/s

MIR and FIR were implemented with IrPhy 1.1, followed by

IrPhy 1.2, adding the SIR Low Power Standard. IrPhy 1.3

extended the low power option to MIR and FIR and VFIR was

added with IrPhy 1.4. A new version of the standard in any

case obsoletes the former version.

PIN DESCRIPTION

PIN NUMBER

SYMBOL

DESCRIPTION

I/O

ACTIVE

1

IREDA

power supply can be used.

2RXD

Receiver output. Normally high, goes low for a defined pulse duration with the rising

edge of the optical input signal. Output is a CMOS tri-state driver, which swings

O

Low

3TXD

Transmitter data input. Setting this input above the threshold turns on the transmitter.

This input switches the IRED with the maximum transmit pulse width of about 100 µs.

IHigh

4SD

Shutdown. Logic low at this input enables the receiver, enables the transmitter, and

un-tri-states the receiver output. It must be driven high for shutting down the

transceiver.

IHigh

Reference for the logic swing of the output and the input logic levels.

I

Power supply, 2.4 V to 3.6 V. This pin provides power for the receiver and transmitter

7

GND

Ground

IRED Driver

TXD

SD

GND

V

CC

IREDA

RXD

Amplifier

Comparator

Tri-State

Driver

Mode

Control

PD

IRED

ASIC

19288

19284