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TFDU6102-TR3 Datasheet(PDF) 10 Page - Vishay Siliconix |
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TFDU6102-TR3 Datasheet(HTML) 10 Page - Vishay Siliconix |
10 / 18 page www.vishay.com 10 Document Number 82550 Rev. 1.6, 05-Dec-05 TFDU6102 Vishay Semiconductors I/O and Software In the description, already different I/Os are men- tioned. Different 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. Mode Switching The TFDU6102 is in the SIR mode after power on as a default mode, therefore the FIR data transfer rate has to be set by a programming sequence using the TXD and SD 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). If not used or in standby mode, the mode input should float or should not be loaded with more than 50 pF. The low frequency mode covers speeds up to 115.2 kbit/s. Signals with higher data rates should be detected in the high fre- quency mode. Lower frequency data can also be received in the high frequency mode but with reduced sensitivity. To switch the transceivers from low frequency mode to the high frequency mode and vice versa, the pro- gramming sequences described below are required. Setting to the High Bandwidth Mode (0.576 Mbit/s to 4.0 Mbit/s) 1. Set SD input to logic "HIGH". 2. Set TXD input to logic "HIGH". Wait ts ≥ 200 ns. 3. Set SD 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 maxi- mum allowed pulse length. After that TXD is enabled as normal TXD input and the transceiver is set for the high bandwidth (576 kbit/ s to 4 Mbit/s) mode. Setting to the Lower Bandwidth Mode (2.4 kbit/s to 115.2 kbit/s) 1. Set SD input to logic "HIGH". 2. Set TXD input to logic "LOW". Wait ts ≥ 200 ns. 3. Set SD to logic "LOW" (this negative edge latches state of TXD, which determines speed setting). 4. TXD must be held for th ≥ 200 ns. After that TXD is enabled as normal TXD input and the transceiver is set for the lower bandwidth (9.6 kbit/ s to 115.2 kbit/s) mode. Table 2. Truth table Figure 2. Mode Switching Timing Diagram TXD SD ts th 50 % High : FIR Low : SIR 50 % 50 % 14873 Inputs Outputs SD TXD Optical input Irradiance mW/m2 RXD Transmitter high x x weakly pulled (500 k Ω) to V CC1 0 low high x low (active) Ie high > 80 μsx high 0 low < 4 high 0 low > Min. irradianceEe < Max. irradiance Ee low (active) 0 low > Max. irradiance Eex 0 |
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Similar Description - TFDU6102-TR3 |
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