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TFDS6402 Datasheet(PDF) 9 Page - Vishay Siliconix |
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TFDS6402 Datasheet(HTML) 9 Page - Vishay Siliconix |
9 / 17 page TFDU6102E/TFDS6402/TFDS6502E/TFDT6502E Vishay Semiconductor Rev. B1.6, 02–Nov–00 9 www.vishay.com Document Number 82526 0 100 200 300 400 500 02468 10 12 14 16 Current Control Resistor ( W ) 14379 min. intensity in emission cone "15 ° max.Rdson, max.VF max. intensity in emission cone "15° Vcc=4.75V min. Rdson, min. VF 5.0V 5.0V 5.25V Figure 4. Intensity Ie vs. Current Control Resistor R1, 5 V Applications 0 100 200 300 400 500 600 700 02468 10 12 Current Control Resistor ( W ) 15111 emission cone "15° Vcc=3.0V min. Rdson, min. VF 3.3V 3.3V 3.6V max. intensity in emission cone "15° max. Rdson, max. VF min. intensity in Figure 5. Intensity Ie vs. Current Control Resistor R1, 3 V Applications In addition, when connecting the described circuit to the power supply, low impedance wiring should be used. I/O and Software In the description, already different I/Os are mentioned. Differnt combinations are tested and the function verified with the special drivers available from the I/O suppliers. In special cases refer to the I/O manual, the Vishay application notes, or contact directly Vishay Sales, Marketing or Application. Control: Differences to TFDx6000 Series For applications using I/Os from NSC, Winbond and TI no software upgrade is necessary. In combination with the latest SMSC controllers for Microsoft Windows 98® a software upgrade is necessary, drivers are available from SMSC and Vishay Semiconductor GmbH. This software is intended to work with Windows 95®, too. Alternatively the HP/ Sharp settings can be selected. The Microsoft Operating Systems NT 5.0® Beta 2 and Windows 2000® provide Miniport device drivers. Mode Switching The TFDU6102E, TFDS6402, TFDS6502E and TFDT6502E do not power on with a default mode, therefore the data transfer rate has to be set by a pro- gramming sequence using the Txd and SD/ Mode inputs as described below or selected by setting the Mode Pin. The Mode Pin can be used to statically set the mode (Mode Pin: LOW: SIR, HIGH: 0.576 Mbit/s to 4.0 Mbit/s). When using the Mode Pin, the standby current may increase to about 50 to 60 mA when high or low. If not used or in standby mode, the mode input should float to minimize standby current. The low frequency mode covers speeds up to 115.2 kbit/s. Sig- nals with higher data rates should be detected in the high frequency mode. Lower frequency data can also be received in the high frequency mode but with re- duced sensitivity. To switch the transceivers from low frequency mode to the high frequency mode and vice versa, the programming sequences described below are required. Txd SD/Mode ts th 50% High : FIR Low : SIR 50% 50% 14873 Figure 6. Mode Switching Timing Diagram Setting to the High Bandwidth Mode (0.576 Mbit/s to 4.0 Mbit/s) 1. Set SD/MODE input to logic “HIGH”. 2. Set Txd input to logic “HIGH”. Wait ts ≥ 200 ns. 3. Set SD/MODE to logic “LOW” (this negative edge latches state of Txd, which determines speed setting). 4. After waiting th ≥ 200 ns Txd can be set to logic “LOW”. The hold time of Txd is limited by the maximum allowed pulse length. Txd is now enabled as normal Txd input for the high bandwidth mode. |
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