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STM32F405 数据表(PDF) 27 Page - STMicroelectronics |
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STM32F405 数据表(HTML) 27 Page - STMicroelectronics |
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27 / 204 page  DS8626 Rev 9 27/203 STM32F405xx, STM32F407xx Description 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 V12 voltage source through VCAP_1 and VCAP_2 pins. Since the internal voltage scaling is not manage internally, the external voltage value must be aligned with the targeted 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 V12. An external power supply supervisor should be used to monitor the V12 of the logic power domain. PA0 pin should be used for this purpose, and act as power-on reset on V12 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 V12 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. • The standby mode is not available 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 |
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