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STM32WBA50KG Datasheet(PDF) 89 Page - STMicroelectronics |
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STM32WBA50KG Datasheet(HTML) 89 Page - STMicroelectronics |
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89 / 110 page  DS14688 Rev 1 89/110 STM32WBA50KG Electrical characteristics 103 Figure 17. 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) maximum level specified in Table 64, or the reset is not taken into account by the device. 3. The external capacitor on NRST must be placed as close as possible to the device. 5.3.18 Extended interrupt and event controller input (EXTI) characteristics Pulses on the extended interrupt and event controller inputs must have a minimal length, to guarantee they are detected. Table 64. NRST pin characteristics(1) Symbol Parameter Conditions Min Typ Max Unit VIL(NRST) Input low level voltage - - - 0.3 x VDD V VIH(NRST) Input high level voltage - 0.7 x VDD -- Vhys(NRST) Schmitt trigger voltage hysteresis - - 200 - mV RPU Weak pull-up equivalent resistor(2) VIN = VSS 30 40 50 kΩ tF(NRST) Input filtered pulse - - - 50 ns tNF(NRST) Input not-filtered pulse 1.71 V ≤ VDD ≤ 3.6 V 330 - - 1.58 V ≤ VDD < 1.71 V 1000 - - 1. Specified by design, not tested in production. 2. The pull-up is designed with a true resistance in series with a switchable PMOS, whose contribution to the series resistance is minimal (~10%) . MS19878V3 RPU VDD Internal reset External reset circuit (1) NRST (2) Filter 0.1 μF (3) Table 65. EXTI input characteristics(1) 1. Specified by design, not tested in production. Symbol Parameter Conditions Min Typ Max Unit t(EXTI) Pulse length to event controller - 20 - - ns |
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