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DS1487MX Datasheet(PDF) 7 Page - Texas Instruments |
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DS1487MX Datasheet(HTML) 7 Page - Texas Instruments |
7 / 10 page Applications Information (Continued) Due to the multipoint nature of the bus, contention between drivers may occur. This will not cause damage to the drivers since they feature short-circuit protection and also thermal shutdown protection. Thermal shutdown senses die tem- perature and puts the driver outputs into TRI-STATE if a fault condition occurs that causes excessive power dissipation which can elevate the junction temperature to +150˚C. A typical multipoint application is shown in the following fig- ure. Note that termination is typically required but is only lo- cated at the two ends of the cable (not on every node). Com- monly pull up and pull down resistors may be required at one end of the bus to provide a failsafe bias. These resistors pro- vide a bias to the line when all drivers are in TRI-STATE. See National Application Note 847 for a complete discussion of failsafe biasing of differention buses. DS012920-16 www.national.com 6 |
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