IBM31T1100 Datasheet, PDF (2/8 Pages) List of Unclassifed Manufacturers – Integrated Infrared Transceiver Module

IBM31T1100A
Pin Assignments and Descriptions
LEDA
8
TX
7
SD/BW
6
NC
5
LED
Photodiode
1
LEDC
2
3
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.
3
V_cc
P 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
P current 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 I
High
P 60 sec. This pin is also used to program the bandwidth of the receiver. See SD/BW pin
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