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STM32F101X6 датащи(PDF) 47 Page - STMicroelectronics |
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STM32F101X6 датащи(HTML) 47 Page - STMicroelectronics |
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47 / 64 page ![]() STM32F101xx Electrical characteristics 47/64 5.3.13 NRST pin characteristics The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up resistor, RPU (see Table 29). Unless otherwise specified, the parameters given in Table 32 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 7. Figure 16. Recommended NRST pin protection 1. The reset network protects the device against parasitic resets. 2. The user must ensure that the level on the NRST pin can go below the VIL(NRST) max level specified in Table 32. Otherwise the reset will not be taken into account by the device. Table 32. NRST pin characteristics(1) 1. TBD stands for to be determined. Symbol Parameter Conditions Min Typ Max Unit VIL(NRST) NRST Input low level voltage –0.5 0.8 V VIH(NRST) NRST Input high level voltage 2 VDD+0.5 Vhys(NRST) NRST Schmitt trigger voltage hysteresis 200 RPU Weak pull-up equivalent resistor(2) 2. 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) . VIN = VSS 30 40 50 k Ω VF(NRST) NRST Input filtered pulse(3) 3. Values guaranteed by design, not tested in production. 100 ns VNF(NRST) NRST Input not filtered pulse (3) 300 µs ai14132b STM32F101xx RPU NRST VDD FILTER Internal Reset 0.1 µF External reset circuit |
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