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TFBS6711-TR1 Datasheet(PDF) 8 Page - Vishay Siliconix |
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TFBS6711-TR1 Datasheet(HTML) 8 Page - Vishay Siliconix |
8 / 14 page TFBS6711 Document Number 84676 Rev. 1.3, 21-Feb-07 Vishay Semiconductors www.vishay.com 265 Mode Switching The TFBS6711 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. The low fre- quency 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 reduced sensitivity. To switch the transceivers from low frequency mode to the high frequency mode and vice versa, the programming sequences described below are required. Setting to the High Bandwidth Mode (0.576 Mbit/s to 4 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. TXD is now enabled as normal TXD input for the high bandwidth 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. TXD is now enabled as normal TXD input for the lower bandwidth mode. Truth table Figure 4. Mode Switching Timing Diagram TXD SD ts th 50 % High: FIR Low: SIR 50 % 50 % 14873 Inputs Outputs SD TXD Input irradiance mW/m2 RXD Transmitter high x x weakly pulled (500 k Ω) high 0 low high x low active (echo) Ie low high > 80 µs x high 0 low low < 4 high 0 low low > Min. irradiance Ee in angular range < Max. irradiance Ee in angular range low (active) 0 low low > Max. irradiance Ee in angular range x0 |
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