IBM31T1100 ETC [List of Unclassifed Manufacturers], IBM31T1100 Datasheet - Page 7

• Manufacturer Part Number: IBM31T1100
• Description: Integrated Infrared Transceiver Module
• Manufacturer: ETC [List of Unclassifed Manufacturers]

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:
Setting the receiver to 4 Mbps mode
1.
2.
3.
4.
Package Dimensions
Set the SD/BW input to logic high.
Set the TX input to logic high. Wait t
Set the SD/BW to logic low. (This high-to-low transition
latches the state of TX, which determines the receiver
bandwidth.)
After waiting t
receiver is now in high bandwidth mode, the optimal setting
for 4 Mbps operation.
3.75 ± 0.5
B
6.7 ± 0.4
5.45 ± 0.5
H
0.5
t
2.35 ± 0.3
200 ns, set the TX input to logic low. The
0.275 ± 0.075
B
S
t
200 ns.
Dimensions in mm.
7
0.9 ± 0.1
Setting the receiver to 9.6 kbps-to-1.2 Mbps mode
1.
2.
3.
4.
SD/BW
(Setting low bandwidth mode)
(Setting high bandwidth mode)
TX
TX
Set the SD/BW input to logic high.
Ensure that the TX input is at logic low. Wait t
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 t
receiver is now in low bandwidth mode, which is the optimal
setting for data rates from 9.6 kbps to 1.2 Mbps.
0.5 ± 0.1
6.5 ± 0.5
13 ± 0.5
Figure 13. Bandwidth Programming
0.5
(7X) 1.27
A
0.635
(2X) 1.45
50%
t
S
50%
t
H
H
t
200 ns. The
S
A
t
50%
200 ns.
V
V
V
V IL
V IL
IH
IH
IL