Texas Instruments TIR1000PSR, TIR1000PWLE, TIR1000PSLE, TIR1000PS, TIR1000IPWR Datasheet

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TIR1000, TIR1000I

STANDALONE IrDA ENCODER AND DECODER

SLLS228F – DECEMBER 1995 – REVISED JUL Y 1999

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Adds Infrared (IR) Port to Universal Asynchronous Receiver Transmitter (UART)

Compatible With Infrared Data Association (IrDA) and Hewlett Packard Serial Infrared (HPSIR)

Provides 1200 bps to 115 kbps Data Rate

Operates From 2.7 V to 5.5 V

Provides Simple Interface With UART

Decodes Negative or Positive Pulses

Available in Two 8-T erminal Plastic Small Outline Packages (PSOP), PS Package Has Slightly Larger Dimensions Than PW Package

description

The TIR1000 serial infrared (SIR) encoder/ decoder is a CMOS device which encodes and decodes bit data in conformance with the IrDA specification.

A transceiver device is needed to interface to the photo-sensitive diode (PIN) and the light emitting diode (LED). A UART is needed to interface to the serial data lines.

Terminal Functions

TERMINAL

NAME NO.

I/O

DESCRIPTION

16XCLK

I Clock signal. 16XCLK should be set to 16 times the baud rate. The highest baud rate for IrDA is 1 15.2 kbps for which the

clock frequency equals 1.843 MHz (this terminal is tied to the BAUDOUT of a UART).

GND

Ground

IR_RXD

I Infrared receiver data. IR_RXD is an IrDA-SIR-modulated input from an optoelectronics transceiver whose input pulses

should be 3/16 of the baud rate period.

IR_TXD

O Infrared transmitter data. IR_TXD is an IrDA-SIR-modulated output to an optoelectronics transceiver.

RESET

I Active high reset. RESET initializes an IrDA-SIR-decode/encode state machine (this terminal is tied to a UAR T reset

line).

U_RXD

O Receiver data. U_RXD is decoded (demodulated) data from IR_RXD according to the IrDA specification (this terminal is

tied to SIN of a UART).

U_TXD

2 I T ransmitter data. U_TXD is encoded (modulated) data and output data as IR_TXD (this terminal is tied to SOUT from a

UART).

8 Supply voltage

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

IrDA is a registered trademark of the Infrared Data Association.

functional block diagram

1 2 3 4

8 7 6 5

16XCLK

U_TXD

U_RXD

GND

IR_TXD IR_RXD RESET

PS OR PW PACKAGE

(TOP VIEW)

Decoder

Encoder

RESET

IR_RXD

16XCLK

U_TXD

U_RXD

IR_TXD

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

TIR1000, TIR1000I STANDALONE IrDA ENCODER AND DECODER

SLLS228F – DECEMBER 1995 – REVISED JUL Y 1999

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

†

Supply voltage range, VCC (see Note 1) –0.5 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage range at any input, VI –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output voltage range, V

–0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, TA, TIR1000 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TA, TIR1000I –40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Case temperature for 10 seconds: SOP package 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: All voltage levels are with respect to GND.

recommended operating conditions over recommended operating free-air temperature range

low voltage (3 V nominal)

MIN NOM MAX UNIT

Supply voltage, V

2.7

3.3

High-level input voltage, V

0.7 V

Low-level input voltage, V

0.2 V

TIR1000

Operating free-air temperature, T

TIR1000I

–40

°C

standard voltage (5 V nominal)

MIN NOM MAX UNIT

Supply voltage, V

4.5 5 5.5 V

High-level input voltage, V

0.7 V

Low-level input voltage, V

0.2 V

TIR1000

Operating free-air temperature, T

TIR1000I

–40

°C

electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

IOH = –4 mA VCC = 5 V VCC – 0.8

VOHHigh-level output voltage

IOH = –1.8 mA VCC = 3 V VCC – 0.55

IOL = +4 mA VCC = 5 V 0.5

VOLLow-level output voltage

IOL = +1.8 mA VCC = 3 V 0.5

Input current VI = 0 to VCC, All other pins floating ±3 µA

Supply current

VCC = 5.25 V , All inputs at 0.2 V , No load on outputs

TA = 25°C, 16XCLK at 2 MHz,

1 mA

i(16XCLK)

Clock input capacitance 5 pF

(16XCLK)

Clock frequency 2 MHz

TIR1000, TIR1000I

STANDALONE IrDA ENCODER AND DECODER

SLLS228F – DECEMBER 1995 – REVISED JUL Y 1999

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

switching characteristics

PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT

Output rise time C

(LOAD)

= 15 pF (10% to 90%) 1.3 ns

Output fall time C

(LOAD)

= 15 pF (90% to 10%) 1.8 ns

†

Typical values are at TA = 25°C.

APPLICATION INFORMATION

To LED

From

TERMINAL

Optoelectronics

U_TXD

U_RXD

16XCLK

IR_TXD IR_RXD

RESET

SOUT SIN BAUDOUT

RESET

TL16C550C UARTTIR1000, TIR1000I

Figure 1. Typical application of the TIR1000, TIR1000I

PRINCIPLES OF OPERATION

IrDA overview

The Infrared Data Association (IrDA) defines several protocols for sending and receiving serial infrared data, including rates of 1 15.2 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 TIR1000 and TIR1000I evaluate only single bits and only follow the 1 15.2 kbps protocol. The 115.2 kbps rate is a maximum rate. When both ends of the transfer are set up to a lower but matching speed, the protocol (with the TIR1000 and TIR1000I) still works. The clock used to code or sample the data is 16 times the baud rate, or 1.843 Mhz maximum. To code a 1, no pulse is sent or received for 1-bit time period, or 16 clock cycles. T o code a 0, one pulse is sent or received within a 1-bit time period, or 16 clock cycles. The pulse must be at least 1.6 µs wide and 3 clock cycles long at 1.843 Mhz. At lower baud rates the pulse can be 1.6 µs wide or as long as 3 clock cycles. The transmitter output, IR_TXD, is intended to drive a LED circuit to generate an infrared pulse. The LED circuits work on positive pulses. A terminal circuit is expected to create the receiver input, IR_RXD. Most, but not all, PIN circuits have inversion and generate negative pulses from the detected infrared light. Their output is normally high. The TIR1000 and TIR1000I can decode either negative or positive pulses on IR_RXD.

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