IBM 31T1100A User Manual

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IBM31T1100A

Integrated Infrared Transceiver Module

Highlights

x

IrDA 1.1, HP- SIR and Sharp ASK c ompliant

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Supports IrDA data rates up to 4 Mbps

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Low pro file (height = 5.6 mm max.)

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Minimum external components

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On-chip L ED pro tec tio n c irc uit

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Low power consumption

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5 V Supply Voltage

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Com p le te d ifferential receiver design

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Am bie n t light and no ise re jection circuitry

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Shutdown pin for po w er management

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Programmable bandwidth control

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Com p a tib le with all major S u p e r I/Os

General Description

The IBM31T1100A is a multi-mode integrated
infrared (IR) transceiver module for data
communication systems. The transceiver supports
IrDA speeds up to 4 Mbps, HP-SIR and Sharp ASK
modes. Integrated into this tiny package is a
photodiode, LED and analog transceiver ASIC to
provide a total solution in a single package. A
current limiting resistor in series with the LED and
a Vcc bypass capacitor are the only external
components required to implement a complete
transceiver.

Pack a g e

Noise

Rejection

Circuit

TX

6

7

Control

logic

SD/BW

Block D ia g r a m

Amp

BW

SD

4

GND

3

Vcc

+

Comp

-

Driver

Driver

2

8

1

RX

Vcc

LEDA

LEDC

IBM31T1100A

Pin Assignm e nts and De s c riptions

LEDA

8

LED

LEDC

Pin Pin Name Description I/O Active

1
2

3

4 GND Connect to ground of the pow er supply. A solid ground plane is recommended f or proper

5 NC This pin is res erved fo r sp e cial application use only. No signal shou ld b e connected to

6 SD/BW This CMOS input is used to put the IBM31T1 100A in shutdown mode. No m inal supply

7 TX Used to transmit serial data when SD/BW is low. This CMOS input controls the LED

8 LEDA Connect this input to Vc c through a resistor to set the proper LE D current. Add an

LEDC

RX

V

cc

Guide Pins

(not shown above)

Ind icates the state o f the internal L ED cathode. Norm ally not connected. O Lo w
Indicates received serial data. It is a push-pull CMOS driver capable of driving a

standard CMOS or TTL load. No external pull-up or pull-down resisto r is required. May
switch indeterminately when the IBM31T1100A is transmitting.
Connect to + 5 V power supply . Place a 1.0- 10 PF ceramic bypass capacitor as close as
possible to this pin.

operation.

this pin.

current draw in this mode is 35 PA versus 5 mA in normal mode. Together with th e T X
input, this pin also sets the receiver bandwidth. If TX is lo w w hen SD /BW transitions
from high to low, the re ceiver band width is optim ized for operation u p to 1.2 Mbps. If
TX is high when SD /BW transition s from high to low, the receiver b an d width is
optim ized for operation a t 4 Mb p s.

driver. A n on-chip protection c irc uit disables the LED driv er if TX is hig h f or more than
60 Psec. Th is pi n is a lso used to pr ogram th e b a n d width of th e receiver. See SD/B W pin
description.

external LED in series to increase output intensity if required. I
Two through-h ole guide pin s p rovide me chanical stab ility during boar d mounting. They
also improv e heat c onduction when the part is in operation.

TX SD/BW

7

1

2

RX

65

NC

Photodiode

V

CC

43

GND

OLow

IHigh

IHigh

NOTE: The IBM31T1100A is pin and plug com patible with the Temic TFDS6000D.

2

IBM31T1100A

Electrical and Timing Specifications

Absolute Maximum Ratings

Symbol Parameter Min Typ Max Unit Condition

V

CC

P

D

T

J

I

LED

Recommended Operating Conditions

Supply Vo ltage R ange - 0.5 6 V
Power Dissipation 450 mW
Junction Temperature 125 °C
Storage Temp erature Rang e - 25 85 °C
Solder ing Tempera tur e 240 °C See application no te s
LED Current 0.8 A <2 µs, ton<10%
Voltage at An y Pin - 0.5 Vcc+ 0.5 V

Symbol Parameter Min Typ Max Unit Condition

V

CC

T

A

DC Electrical C haracteristics

Supply Vo ltage 4.5 5 5.5 V
Operating Temperature Range 0 70 °C

TA = 0 - 70 qC, V

= 5 V r 10 %, unless otherwise specified

CC

Symbol Parameter Min Ty p Max Unit Condition

I
V

V

I
I

LED

V
V
V

C

CC

CC

I

Dynam ic Supply Current 5 7 mA SD = 0 V
Standby Supply C urrent 35 100 uA SD = V
Repetitiv e P u ls ed LED Curre nt 0.55 A < 60 µs, t

RX

OL

OH

IL

IH

IH

L

I

Output Voltage Low @ IOL = 2.5 mA 0.3 0.5 V

RX

Output Voltage High @ -IOH = 2.5 mA V

- 0.5 V

CC

Input Voltage Low (TX, SD/BW) 0 0.8 V
Input Voltag e Hig h (TX ) 3.0 V
Input Voltag e Hig h (SD /BW) V

- 0.5 V

CC

Input Leakage Current - 10 +10 uA
Input Capacitance 5 pF

- 0.5, SC = NC

CC

d

25 %

on

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