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STM32L031C6 датащи(PDF) 83 Page - STMicroelectronics |
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STM32L031C6 датащи(HTML) 83 Page - STMicroelectronics |
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83 / 118 page ![]() DocID027063 Rev 4 83/118 STM32L031x4/6 Electrical characteristics 95 Figure 27. I/O AC characteristics definition 6.3.14 NRST pin characteristics The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up resistor, RPU , except when it is internally driven low (see Table 56). Unless otherwise specified, the parameters given in Table 56 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 20. Table 56. NRST pin characteristics Symbol Parameter Conditions Min Typ Max Unit VIL(NRST)(1) 1. Guaranteed by design. NRST input low level voltage - VSS -0.8 V VIH(NRST)(1) NRST input high level voltage - 1.4 - VDD VOL(NRST)(1) NRST output low level voltage IOL = 2 mA 2.7 V < VDD < 3.6 V -- 0.4 IOL = 1.5 mA 1.65 V < VDD < 2.7 V -- Vhys(NRST)(1) NRST Schmitt trigger voltage hysteresis -- 10%VDD(2) 2. 200 mV minimum value -mV RPU Weak pull-up equivalent resistor(3) 3. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series resistance is around 10%. VIN VSS 30 45 60 k VF(NRST)(1) NRST input filtered pulse - - - 50 ns VNF(NRST)(1) NRST input not filtered pulse - 350 - - ns |
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