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STM32F405XX Datasheet(PDF) 26 Page - STMicroelectronics |
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STM32F405XX Datasheet(HTML) 26 Page - STMicroelectronics |
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26 / 185 page  Description STM32F405xx, STM32F407xx 26/185 DocID022152 Rev 4 Two external ceramic capacitors should be connected on VCAP_1 & VCAP_2 pin. Refer to Figure 21: Power supply scheme and Figure 16: VCAP_1/VCAP_2 operating conditions. All packages have regulator ON feature. Regulator OFF This feature is available only on packages featuring the BYPASS_REG pin. The regulator is disabled by holding BYPASS_REG high. The regulator OFF mode allows to supply externally a V 12 voltage source through V CAP_1 and VCAP_2 pins. Since the internal voltage scaling is not manage internally, the external voltage value must be aligned with the targetted maximum frequency. Refer to Table 14: General operating conditions. The two 2.2 µF ceramic capacitors should be replaced by two 100 nF decoupling capacitors. Refer to Figure 21: Power supply scheme When the regulator is OFF, there is no more internal monitoring on V 12. An external power supply supervisor should be used to monitor the V 12 of the logic power domain. PA0 pin should be used for this purpose, and act as power-on reset on V 12 power domain. In regulator OFF mode the following features are no more supported: • PA0 cannot be used as a GPIO pin since it allows to reset a part of the V 12 logic power domain which is not reset by the NRST pin. • As long as PA0 is kept low, the debug mode cannot be used under power-on reset. As a consequence, PA0 and NRST pins must be managed separately if the debug connection under reset or pre-reset is required. Figure 9. Regulator OFF ai18498V4 External VCAP_1/2 power supply supervisor Ext. reset controller active when VCAP_1/2 < Min V12 V12 VCAP_1 VCAP_2 BYPASS_REG VDD PA0 NRST Application reset signal (optional) VDD V12 |
Similar Part No. - STM32F405XX_13 |
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Similar Description - STM32F405XX_13 |
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