IBM31T1100
IBM31T1100A
Integrated Infrared Transceiver Module
Highlights
xIrDA 1.1, HP-SIR and Sharp ASK compliant
xSupports IrDA data rates up to 4 Mbps
xLow profile (height = 5.6 mm max.)
xMinimum external components
xOn-chip LED protection circuit
xLow power consumption
x5 V Supply Voltage
xComplete differential receiver design
xAmbient light and noise rejection circuitry
xShutdown pin for power management
xProgrammable bandwidth control
xCompatible 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
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Vcc |
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3 |
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Noise |
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+ |
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2 |
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Rejection |
Amp |
Comp |
Driver |
RX |
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Circuit |
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- |
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Vcc |
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8 |
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BW |
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LEDA |
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6 |
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SD/BW |
Control |
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SD |
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TX |
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logic |
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Driver |
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1 LEDC |
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4 |
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GND |
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Block Diagram
IBM31T1100A
Pin Assignments and Descriptions
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LEDA |
TX |
SD/BW |
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NC |
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8 |
7 |
6 |
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5 |
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LED |
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Photodiode |
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1 |
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2 |
3 |
4 |
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LEDC |
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V CC |
GND |
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RX |
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Pin |
Pin Name |
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Description |
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I/O |
Active |
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1 |
LEDC |
Indicates the state of the internal LED cathode. Normally not connected. |
O |
Low |
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2 |
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Indicates received serial data. It is a push-pull CMOS driver capable of driving a |
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RX |
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standard CMOS or TTL load. No external pull-up or pull-down resistor is required. May |
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Low |
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switch indeterminately when the IBM31T1100A is transmitting. |
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3 |
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Vcc |
Connect to +5 V power supply. Place a 1.0-10 PF ceramic bypass capacitor as close as |
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possible to this pin. |
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4 |
GND |
Connect to ground of the power supply. A solid ground plane is recommended for proper |
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operation. |
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5 |
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NC |
This pin is reserved for special application use only. No signal should be connected to |
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this pin. |
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6 |
SD/BW |
This CMOS input is used to put the IBM31T1100A in shutdown mode. Nominal supply |
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current draw in this mode is 35 PA versus 5 mA in normal mode. Together with the TX |
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input, this pin also sets the receiver bandwidth. If TX is low when SD/BW transitions |
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High |
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from high to low, the receiver bandwidth is optimized for operation up to 1.2 Mbps. If |
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TX is high when SD/BW transitions from high to low, the receiver bandwidth is |
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optimized for operation at 4 Mbps. |
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7 |
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TX |
Used to transmit serial data when SD/BW is low. This CMOS input controls the LED |
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driver. An on-chip protection circuit disables the LED driver if TX is high for more than |
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High |
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60 Psec. This pin is also used to program the bandwidth of the receiver. See SD/BW pin |
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description. |
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8 |
LEDA |
Connect this input to Vcc through a resistor to set the proper LED current. Add an |
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external LED in series to increase output intensity if required. |
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Guide Pins |
Two through-hole guide pins provide mechanical stability during board mounting. They |
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(not shown above) |
also improve heat conduction when the part is in operation. |
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NOTE: The IBM31T1100A is pin and plug compatible with the Temic TFDS6000D.
2
IBM31T1100A
Electrical and Timing Specifications
Absolute Maximum Ratings
Symbol |
Parameter |
Min |
Typ |
Max |
Unit |
Condition |
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VC C |
Supply Voltage Range |
- 0.5 |
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6 |
V |
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PD |
Power Dissipation |
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450 |
mW |
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TJ |
Junction Temperature |
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125 |
°C |
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Storage Temperature Range |
- 25 |
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85 |
°C |
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Soldering Temperature |
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240 |
°C |
See application notes |
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ILED |
LED Current |
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0.8 |
A |
<2 µs, t on<10% |
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Voltage at Any Pin |
- 0.5 |
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Vcc+ 0.5 |
V |
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Recommended Operating Conditions
Symbol |
Parameter |
Min |
Typ |
Max |
Unit |
Condition |
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VC C |
Supply Voltage |
4.5 |
5 |
5.5 |
V |
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TA |
Operating Temperature Range |
0 |
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70 |
°C |
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DC Electrical Characteristics |
TA = 0 - 70 qC, VCC = 5 V r 10 %, unless otherwise specified |
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Symbol |
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Parameter |
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Min |
Typ |
Max |
Unit |
Condition |
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ICC |
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Dynamic Supply Current |
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5 |
7 |
mA |
SD = 0 V |
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ICC |
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Standby Supply Current |
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35 |
100 |
uA |
SD = VCC - 0.5, SC = NC |
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ILED |
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Repetitive Pulsed LED Current |
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0.55 |
A |
< 60 µs, t on d 25 % |
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VOL |
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RX Output Voltage Low @ IOL = 2.5 mA |
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0.3 |
0.5 |
V |
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VOH |
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RX Output Voltage High @ -IOH = 2.5 mA |
VCC - 0.5 |
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V |
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VIL |
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Input Voltage Low (TX, SD/BW) |
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0 |
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0.8 |
V |
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VIH |
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Input Voltage High (TX) |
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3.0 |
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V |
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VIH |
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Input Voltage High (SD/BW) |
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VCC - 0.5 |
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V |
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IL |
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Input Leakage Current |
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-10 |
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+10 |
uA |
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CI |
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Input Capacitance |
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5 |
pF |
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3
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