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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9947S датащи(PDF) 7 Page - STMicroelectronics |
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L9947S датащи(HTML) 7 Page - STMicroelectronics |
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7 / 13 page  SYSTEM STARTUP (figure 2) It is not mandatory that VS is present before VCC. With the presence of the VCC the internal logic would be reseted and the system restarts under control of the inputs. If CSN = 0 for more than 100 µs after the presence of VCC the standby mode is activated. Standby is also activated when the CSN and VCC would be high at the same time. When CSN = 0 and VCC goes up, the device is not controlled by the bus. The outputs remain in tristate but the current consumption is larger than 100 µA. A high - low - signal at the CSN - wire is mandatory to control the outputs. There is no un- dervoltage detection level for the supply voltage VS implemented. The VCC should be supplied from the same voltage supply as the driver of the D0 -D3 pins (eg. µC). Figure 2: System Startup Sequence L9947 7/13 |
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