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STM32G474VCU6 Datasheet(PDF) 125 Page - STMicroelectronics |
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STM32G474VCU6 Datasheet(HTML) 125 Page - STMicroelectronics |
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125 / 232 page  DS12288 Rev 1 125/232 STM32G474xB STM32G474xC STM32G474xE Electrical characteristics 201 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 21. Typical application with a 32.768 kHz crystal Note: An external resistor is not required between OSC32_IN and OSC32_OUT and it is forbidden to add one. Table 45. LSE oscillator characteristics (fLSE = 32.768 kHz)(1) 1. Guaranteed by design. Symbol Parameter Conditions(2) 2. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator design guide for ST microcontrollers”. Min Typ Max Unit IDD(LSE) LSE current consumption LSEDRV[1:0] = 00 Low drive capability -250 - nA LSEDRV[1:0] = 01 Medium low drive capability -315 - LSEDRV[1:0] = 10 Medium high drive capability -500 - LSEDRV[1:0] = 11 High drive capability -630 - 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(LSE)(3) 3. tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation is reached. This value is measured for a standard crystal and it can vary significantly with the crystal manufacturer Startup time VDD is stabilized - 2 - s |
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