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IBM
IBM


IBM31T1100A

Integrated Infrared Transceiver Module



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IBM31T1100A pdf
IBM31T1100A
Integrated Infrared Transceiver Module
Highlights
x IrDA 1.1, HP-SIR and Sharp ASK compliant
x Supports IrDA data rates up to 4 Mbps
x Low profile (height = 5.6 mm max.)
x Minimum external components
x On-chip LED protection circuit
x Low power consumption
x 5 V Supply Voltage
x Complete differential receiver design
x Ambient light and noise rejection circuitry
x Shutdown pin for power management
x Programmable bandwidth control
x Compatible with all major Super 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.
Package
Vcc
3
Noise
Rejection
Circuit
Amp
+
Comp
-
Driver
SD/BW 6
TX 7
BW
Control SD
logic
Block Diagram
4
GND
Driver
2
RX
Vcc
8
LEDA
1 LEDC



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IBM31T1100A pdf
IBM31T1100A
Pin Assignments and Descriptions
LEDA
8
TX
7
SD/BW
6
NC
5
LED
Photodiode
1
LEDC
23
RX V CC
4
GND
Pin Pin Name
Description
I/O Active
1
LEDC
Indicates the state of the internal LED cathode. Normally not connected.
O Low
2 Indicates received serial data. It is a push-pull CMOS driver capable of driving a
RX
standard CMOS or TTL load. No external pull-up or pull-down resistor is required. May O
Low
switch indeterminately when the IBM31T1100A is transmitting.
P3 Vcc Connect to +5 V power supply. Place a 1.0-10 F ceramic bypass capacitor as close as
possible to this pin.
4
GND
Connect to ground of the power supply. A solid ground plane is recommended for proper
operation.
5 NC This pin is reserved for special application use only. No signal should be connected to
this pin.
6
SD/BW
This CMOS input is used to put the IBM31T1100A in shutdown mode. Nominal supply
Pcurrent draw in this mode is 35 A versus 5 mA in normal mode. Together with the TX
input, this pin also sets the receiver bandwidth. If TX is low when SD/BW transitions
I High
from high to low, the receiver bandwidth is optimized for operation up to 1.2 Mbps. If
TX is high when SD/BW transitions from high to low, the receiver bandwidth is
optimized for operation at 4 Mbps.
7 TX Used to transmit serial data when SD/BW is low. This CMOS input controls the LED
driver. An on-chip protection circuit disables the LED driver if TX is high for more than
P60 sec. This pin is also used to program the bandwidth of the receiver. See SD/BW pin
I
High
description.
8
LEDA
Connect this input to Vcc through a resistor to set the proper LED current. Add an
external LED in series to increase output intensity if required.
I
Guide Pins
Two through-hole guide pins provide mechanical stability during board mounting. They
(not shown above) also improve heat conduction when the part is in operation.
NOTE: The IBM31T1100A is pin and plug compatible with the Temic TFDS6000D.
2



Part Number IBM31T1100A
Description Integrated Infrared Transceiver Module
Maker IBM - IBM
Total Page 8 Pages
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