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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F446ME датащи(PDF) 123 Page - STMicroelectronics |
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STM32F446ME датащи(HTML) 123 Page - STMicroelectronics |
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123 / 201 page  DocID027107 Rev 5 123/201 STM32F446xC/E Electrical characteristics 174 Figure 32. I/O AC characteristics definition 6.3.18 NRST pin characteristics The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up resistor, RPU (see Table 56: I/O static characteristics). Unless otherwise specified, the parameters given in Table 59 are derived from tests performed under the ambient temperature and VDD supply voltage conditions summarized in Table 16. 1. Guaranteed by design. 2. The I/O speed is configured using the OSPEEDRy[1:0] bits. Refer to the STM32F4xx reference manual for a description of the GPIOx_SPEEDR GPIO port output speed register. 3. The maximum frequency is defined in Figure 32. 4. For maximum frequencies above 50 MHz and VDD > 2.4 V, the compensation cell should be used. Table 59. NRST pin characteristics Symbol Parameter Conditions Min Typ Max Unit RPU Weak pull-up equivalent resistor(1) VIN = VSS 30 40 50 k Ω VF(NRST)(2) NRST Input filtered pulse - - - 100 ns VNF(NRST)(2) NRST Input not filtered pulse VDD > 2.7 V 300 - - ns TNRST_OUT Generated reset pulse duration Internal Reset source 20 - - µs 1. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series resistance must be minimum (~10% order) . 2. Guaranteed by design. |
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