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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
2
RX Vcc
-
8 SD/BW TX 6 7 Control logic
BW SD
LEDA
Driver
1 LEDC
4 GND
Block Diagram
IBM31T1100A
Pin Assignments and Descriptions
LEDA
8
TX
7
SD/BW
6
NC
5
LED
Photodiode
1
2
3
4
LEDC
RX
V CC
GND
Pin 1 2
Pin Name LEDC
RX
Description Indicates the state of the internal LED cathode. Normally not connected. 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 resistor 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. Connect to ground of the power supply. A solid ground plane is recommended for proper operation. This pin is reserved for special application use only. No signal should be connected to this pin. This CMOS input is used to put the IBM31T1100A in shutdown mode. Nominal supply current draw in this mode is 35 PA 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 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. 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 60 Psec. This pin is also used to program the bandwidth of the receiver. See SD/BW pin description. 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. Two through-hole guide pins provide mechanical stability during board mounting. They also improve heat conduction when the part is in operation.
I/O O O
Active Low Low
3 4 5 6
Vcc GND NC SD/BW
I
High
7
TX
I
High
8
LEDA Guide Pins (not shown above)
I
NOTE: The IBM31T1100A is pin and plug compatible with the Temic TFDS6000D.
2
IBM31T1100A
Electrical and Timing Specifications
Absolute Maximum Ratings
Symbol V CC PD TJ
Parameter Supply Voltage Range Power Dissipation Junction Temperature Storage Temperature Range Soldering Temperature
Min - 0.5
Typ
Max 6 450 125
Unit V mW C C C A V
Condition
- 25
85 240 0.8
See application notes <2 s, ton<10%
ILED
LED Current Voltage at Any Pin - 0.5
Vcc+ 0.5
Recommended Operating Conditions
Symbol V CC TA
Parameter Supply Voltage Operating Temperature Range
Min 4.5 0
Typ 5
Max 5.5 70
Unit V C
Condition
DC Electrical Characteristics
Symbol ICC ICC ILED V OL V OH V IL V IH V IH IL CI Parameter Dynamic Supply Current Standby Supply Current Repetitive Pulsed LED Current
TA = 0 - 70 qC, VCC = 5 V r 10 %, unless otherwise specified Min Typ 5 35 Max 7 100 0.55 0.3 VCC - 0.5 0 3.0 VCC - 0.5 -10 +10 5 0.8 0.5 Unit mA uA A V V V V V uA pF Condition SD = 0 V SD = VCC - 0.5, SC = NC < 60 s, ton d 25 %
RX Output Voltage Low @ IOL = 2.5 mA RX Output Voltage High @ -IOH = 2.5 mA
Input Voltage Low (TX, SD/BW) Input Voltage High (TX) Input Voltage High (SD/BW) Input Leakage Current Input Capacitance
3
IBM31T1100A
AC Electrical Characteristics
Symbol tR tF tS tH t PW t PW t PW t PW tD tL t RXEN t DIS_ LED Parameter
RX Rise Time RX Fall Time
TA = 0 - 70 qC, VCC = 5 V r 10 %, unless otherwise specified Min 10 10 200 200 0.8 100 60 185
2
Typ
Max 40 40
Unit ns ns ns ns
Condition RLED = 2.0 K:, C = 50 pF RLED = 2.0 K:, C = 50 pF
TX Setup Time to SD/BW Low TX Hold Time from SD/BW Low
RX Pulse Width RX Pulse Width RX Pulse Width RX Pulse Width
20 500 165 290 1 2 120 60 60
us ns ns ns us us us us
9.6 kbps 1.2 Mbps 4 Mbps 4 Mbps double pulse
Output Delay @ Ee = 40 mW/cm Latency
RX Valid After Shutdown
d 1.2 Mbps
LEDC Inactive After TX High
Optical Characteristics
Symbol E emin E emin E emin E emax Parameter
TA = 0 - 70 qC, VCC = 5 V r 10%, unless otherwise specified Min Typ 0.025 0.035 0.07 5000 100 140 320 (1) Max 0.035 0.05 0.08 Unit Wm
-2 -2 -2 -2
Condition 9.6 - 115 kbps 1.2 Mbps 4 Mbps All speeds Tx = High, SD = Low, RLED = 5.6 : Tx=Low or SD=High, RLED=5.6 : VCC=5.0, D=0 q, D=r15 q, TA=25 qC VCC=5.0, D=0 q, D=r15 q, TA=25 qC
Minimum Detection Irradiance (SIR mode) Minimum Detection Irradiance Minimum Detection Irradiance Maximum Detection Irradiance
Wm Wm Wm
mW/sr
Ie
Output Radiant Intensity 0.4 uW/sr
D OP
1.
Output Radiant Intensity Half Angle Peak Wavelength Optical Overshoot 880
r24
900 25
q
nm %
Maximum intensity specified for class 1 operation of IEC 825-1
4
IBM31T1100A
I F LED Forward Current (mA)
IF Forward Current (mA)
700 600 500 400 300 200 100 2.0 2.2 2.4 2.6 Min Max
700 600 500 400 300 200 100 1.5 1.7 1.9 2.1 Min Max
VLEDA Forward Voltage (V) - TA = 25C Figure 1. VLEDA to GND Voltage vs. peak LED current. 175 150 125 100 75 50 25 0.2 0.4 0.6 0.8 Typ Min Input Irradiance in mW/cm**2 Output Intensity in mW/Sr
VF LED Forward Voltage (V) - T = 25C A Figure 2. LED Forward Voltage vs. Current 1000 100 10.0 1.0 0.1 0.01 0.001 50 100 150 200
IF Forward Current in Amperes Figure 3. Output Intensity vs. Current
RX pulse width in ns Figure 4. RX pulse width vs. Irradiance - 4 Mbps mode.
VLEDA to GND Voltage (V)
Output Intensity in mW/Sr
2.4 2.3 2.2 2.1 2.0 1.9 1.8 10 20 30 40 50 60 70 80 Temperature in C Figure 5. VLEDA to GND Voltage vs. Temperature. IF =430mA
175 150 125 100 75 50 25 10 20 30 40 50 60 70 80 Temperature in C Figure 6. Output Intensity vs. Temperature IF =430mA
5
IBM31T1100A
Timing Diagrams
V IH
V IH
TX
50% V IL tL V OH
SD/BW
50% V IL
t RXEN RX
50%
RX
50% V OL
Figure 7. Latency Timing
Figure 8. RX valid after Shutdown.
V IH
t PW RX
50%
TX
50% t DIS_LED V IL Vcc
V OH
V OL
LEDC
50%
Figure 9. LED Protection Timing
Figure 10. RX Timing, 1.2 and 4 Mbps mode
t PW
t RXH VOH
tF
tR 90%
VOH
RX
10% VOL
RX
50%
50% VOL
Figure 11. RX Timing, SIR mode. The output is indeterminate in the shaded area. Spurious transitions may occur.
Figure 12. RX Rise and Fall timing measurements.
6
IBM31T1100A
Programming the Receiver Bandwidth
The IBM31T1100A powers on with the upper limit of the receiver bandwidth set to 1.2 Mbps operation. To set the bandwidth for operation at 4 Mbps, apply timings as shown in Figure 14 to the SD/BW and the TX inputs. Note that the internal LED driver is disabled when SD/BW is active and is not enabled until the next rising edge of TX. This ensures that the LED(s) will not be active during bandwidth adjustment. It is recommended that the SD/BW pin be connected to GND if bandwidth adjustment and shutdown mode are not used. To switch the IBM31T1100A from the default state to 4 Mbps and vice versa, the programming specifications are as follows:
V IH
SD/BW
50% V IL
tS TX
(Setting high bandwidth mode)
tH
V IH
50%
50% V IL
TX
(Setting low bandwidth mode)
V IL
Figure 13. Bandwidth Programming
Setting the receiver to 4 Mbps mode
1. 2. 3. Set the SD/BW input to logic high. Set the TX input to logic high. Wait tS t 200 ns. Set the SD/BW to logic low. (This high-to-low transition latches the state of TX, which determines the receiver bandwidth.) After waiting tH t 200 ns, set the TX input to logic low. The receiver is now in high bandwidth mode, the optimal setting for 4 Mbps operation.
Setting the receiver to 9.6 kbps-to-1.2 Mbps mode
1. 2. 3. Set the SD/BW input to logic high. Ensure that the TX input is at logic low. Wait tS t 200 ns. Set the SD/BW to logic low. (This high-to-low transition latches the state of TX, which determines the receiver bandwidth.) Ensure that the TX input remains low for tH t 200 ns. The receiver is now in low bandwidth mode, which is the optimal setting for data rates from 9.6 kbps to 1.2 Mbps.
4.
4.
Package Dimensions
13 0.5 6.5 0.5 0.5 A A
5.45 0.5 3.75 0.5
4.00.3
3.7 0.5
3.3 0.5
B 0.275 0.075 2.35 0.3 6.7 0.4 0.5 B
0.6 0.2
0.5 0.1 0.9 0.1
(7X) 1.27 (2X) 1.45
Dimensions in mm. 7
1.50.2
0.635
5.3 0.3
5 3
IBM31T1100A
Revision History
The following changes have been made in the specifications from the IBM31T1100 data sheet. 1. 2. 3. 4. 5. Improved Irradiance values have been updated. LED protection circuit has been added. The RX rise time specification is 40 ns instead of 35 ns. 200K internal pull-down resistor has been removed from the SD/BW pin. Output Intensity and RX pulse width graphs have been updated.

International Business Machines Corporation 1995 Printed in the United States of America 5-97 All Rights Reserved

IBM and the IBM logo are registered trademarks of the IBM Corporation. IBM Microelectronics is a trademark of the IBM Corporation. Hewlett-Packard is a registered trademark of Hewlett-Packard Corporation. Sharp is a trademark of Sharp Electronics Corporation.
Ordering Information
Order Part Number IBM31T1100A Qty/Reel 750 Pieces
All other registered trademarks and trademarks are the properties of their respective companies. The information provided is believed to be accurate and reliable. IBM reserves the right to make changes to the product described without notice. No liability is assumed as a result of its use nor for any infringement of the rights of others. This document may contain preliminary information and is subject to change by IBM without notice. IBM assumes no responsibility of liability for any use of the information contained herein. Nothing in this document shall operate as an express or implied license or indemnity under the intellectual property rights of IBM or third parties. The products described in this document are not intended for use in implantation or other direct life support applications where malfunction may result in direct physical harm or injury to persons. NO WARRANTIES OF ANY KIND, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE OFFERED IN THIS DOCUMENT. IBM Microelectronics Division 1580 Route 52, Bldg. 504 Hopewell Junction, NY 12533-6531 The IBM home page can be found at http://www.ibm.com The IBM Microelectronics Division home page can be found at http://www.chips.ibm.com GH45-5286-01
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