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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CD00237391 датащи(PDF) 123 Page - STMicroelectronics |
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CD00237391 датащи(HTML) 123 Page - STMicroelectronics |
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123 / 177 page  STM32F20xxx Electrical characteristics Doc ID 15818 Rev 9 123/177 5.3.24 Embedded reference voltage The parameters given in Table 69 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 12. 5.3.25 FSMC characteristics Asynchronous waveforms and timings Figure 54 through Figure 57 represent asynchronous waveforms and Table 70 through Table 73 provide the corresponding timings. The results shown in these tables are obtained with the following FSMC configuration: ● AddressSetupTime = 1 ● AddressHoldTime = 1 ● DataSetupTime = 1 ● BusTurnAroundDuration = 0x0 In all timing tables, the THCLK is the HCLK clock period. Table 69. Embedded internal reference voltage Symbol Parameter Conditions Min Typ Max Unit VREFINT Internal reference voltage –40 °C < TA < +105 °C 1.18 1.21 1.24 V TS_vrefint (1) 1. Shortest sampling time can be determined in the application by multiple iterations. ADC sampling time when reading the internal reference voltage 10 - - µs VRERINT_s (2) 2. Guaranteed by design, not tested in production. Internal reference voltage spread over the temperature range VDD = 3 V - 3 5 mV TCoeff (2) Temperature coefficient - 30 50 ppm/°C tSTART (2) Startup time - 6 10 µs |
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