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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TPS22986 датащи(PDF) 9 Page - Texas Instruments |
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TPS22986 датащи(HTML) 9 Page - Texas Instruments |
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9 / 22 page  TPS22986 www.ti.com SLVSBS5 – JANUARY 2013 Valid VDD at Inputs A valid VDD on either input occurs when the voltage on VDD1 or VDD2 is between VUVLO and VHVLO (VUVLO < VDD < VHVLO). The VDD voltage is invalid when outside of this range. A VDD is considered high when VDD > VHVLO. Table 1 shows the relationship between the output voltages and the input voltages. Note, other factors also determine whether OUTA and OUTB are open. Table 1 only shows the relationship to the voltage at the inputs VDD1 and VDD2. Table 1. Output Voltages vs Input Voltages VDD1 VDD2 OUTA OUTB Invalid Invalid Open Open Valid Valid or Invalid VDD1 VDD1 Invalid Valid VDD2 Open High Valid VDD2 VDD2 Mode Selection The TPS22986 has two modes of operation, Normal and Control. Refer to the Normal Mode and Control Mode sections for the operational description of each mode. At power-up, the TPS22986 determines which mode the device will operate in. At power-up, the resistance RPUCFGOE is switched to the CFG/OE pin. The external resistance connected to the pin determines the mode. To enter Normal Mode, leave this pin floating or ensure that any external pull-down resistance on this pin is equal to or greater than RPDNORMAL. When the UART buffers/level-shifters are used in this mode, the CFG/OE pin will also be the output enable for the TXH output. The RPDNORMAL resistance is recommended in series with the driver of the CFG/OE pin to prevent this driver from loading CFG/OE during power-up. To enter Control Mode, the CFG/OE pin must be pulled low during power-up. Connect a resistance less than or equal to RPDCONTROL between CFG/OE and ground that will pull the pin low during power-up. Again, the CFG/OE pin is the output enable for the TXH output. The RPDCONTROL resistance should be chosen such that the device driving CFG/OE can overdrive this resistance. Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS22986 |
Аналогичный номер детали - TPS22986 |
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Аналогичное описание - TPS22986 |
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