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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32MP157F датащи(PDF) 154 Page - STMicroelectronics |
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STM32MP157F датащи(HTML) 154 Page - STMicroelectronics |
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154 / 260 page  Electrical characteristics STM32MP157C/F 154/260 DS12505 Rev 5 Note: For information on selecting the crystal, refer to the application note AN2867 “Oscillator design guide for ST microcontrollers” available from the ST website www.st.com. Figure 20. Typical application with a 32.768 kHz crystal 1. Adding an external resistor between OSC32_IN and OSC32_OUT is forbidden. Table 34. Low-speed external user clock characteristics(1) Symbol Parameter Operating conditions(2) Min Typ Max Unit F Oscillator frequency - - 32.768 - kHz IDD LSE current consumption LSEDRV[1:0] = 00, Low drive capability -290 - nA LSEDRV[1:0] = 01, Medium Low drive capability -390 - LSEDRV[1:0] = 10, Medium high drive capability -550 - LSEDRV[1:0] = 11, High drive capability -900 - Gmcritmax Maximum critical crystal gm LSEDRV[1:0] = 00, Low drive capability -- 0.5 µA/V LSEDRV[1:0] = 01, Medium Low drive capability - - 0.75 LSEDRV[1:0] = 10, Medium high drive capability -- 1.7 LSEDRV[1:0] = 11, High drive capability -- 2.7 tSU(3) Startup time VDD is stabilized - 2 - s 1. Guaranteed by design. 2. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator design guide for ST microcontrollers. 3. tSU is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 k Hz oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer. ai17531c STM32 OSC32_OUT fHSE CL1 RF 32.768 kHz resonator Bias controlled gain OSC32_IN CL2 Resonator with integrated capacitors |
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