STM32芯片datasheet中有提到:PC13, PC14 and PC15 are supplied through the power switch. Since the switch only sinks a limited amount of current
(3
mA), the use of GPIOs PC13 to PC15 in output mode is limited:
- The speed should not exceed 2
MHz with a maximum load of 30 pF.
- These GPIOs must not be used as current sources (e.g. to drive an LED).
现在设计时用有用到这几个脚来驱动led。上面资料中提到内部的开关不能驱动超过3mA的led。现在led是接外部3.3V电源,通过管脚出低电平来点亮,这时的电流是外部提供的(开漏输出),是否就不用考虑资料上说的这个限制?电流通过外部提供,通过管脚下地没有经过内部开关。
请教下是不是这样的?
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