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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM8805 датащи(PDF) 30 Page - STMicroelectronics |
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PM8805 датащи(HTML) 30 Page - STMicroelectronics |
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30 / 45 page  PM8805 overview PM8805 30/45 DS12813 Rev 1 Figure 9. Simplified rear aux connections 4.11 Operation modes and STBY, FAUX, RAUX command signals In the PM8805, 3 command signals are available which may be combined to obtain 7 different operation modes, as synthetically described in Table 10. The table describes the behavior of the PGD signal, the hot swap MOSFET, the charge pump, the active bridge and the MPS circuitry depending on the configuration on the inputs. In order to set a "1" signal on the inputs, it is needed to drive the voltage of those pins above their threshold (1.25 V typ.). Below that threshold the configuration cannot be detected, and the system behaves as if it has a "0" input, which is the default PoE standard configuration. Depending on the value of the voltage source used as pull-up for STBY, FAUX, RAUX, the resistor divider must be sized taking into account the voltage on the command pins above their thresholds but still below their AMR (6 V). |
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