Hi Thanks for your sharing.
当GPIO处于output模式,一般选择no pull,引脚能够正确地输出目标值; 当GPIO处于input模式,需要根据默认的输入值来确定配置模式,如果默认输入的值为1时,最好配置为pull up,否则,最好配置为pull down; 当按照上面的规则进行配置之后,则能够避免外部电路没有上拉、下拉电阻时出现的不确定情况。 注意:上拉(pull up)是...
A gate of the pull-down MOSFET (110) is coupled to the drain of the main switch transistor (102) by a capacitor 118 and is connected to a source of the main switch transistor (102) by a resistor (120). The pull-down MOSFET (110) is operated by capacitive coupling to the voltage ...
想要输出高电平,必须外部再接一个上拉电阻(pull-up resistor)。 Open-drain只能够漏电流(sink current),如果想要集电流(source current),则需要加一个上拉电阻。 2、优点 (1)对于各种电压节点间的电平转换非常有用,可以用于各种电压节点的Up-translate和Down-translate转换。 (2)可以将多个开漏输出的Pin脚,连接到...
The function of a pull-up or pull-down resistor is toconduct awayany undesired electrical chargeso that it cannot impact the input pin's state. (Pull-upresistors prevent the pin from floating by forcingthe signalto VCC when it is not being actively driven.) ...
开漏电路就是指以MOSFET的漏极为输出的电路。指内部输出和地之间有个N沟道的MOSFET(Q1),这些器件可以用于电平转换的应用。输出电压由Vcc'决定。Vcc'可以大于输入高电平电压VCC(up-translate)也可以低于输入高电平电压VCC(down-translate)。 Open-drain输出,则是比push-pull少了个top transistor,只有那个bottom transist...
也可以低于输入高电平电压VCC(call Down-Translate), Open-Drain比push-pull少了个top transistor,只有bottom transistor。 就像push-pull中那样,当bottom transistor关闭,则输出为高电平,但此处没法输出高电平。 想要输出高电平,必须外部再接一个上拉电阻(pull-up resistor)。
A semiconductor device includes a CMOSFET, including n-channel and p- channel MOSFETs. A terminal is connected to a node connecting the drains of the MOSFETs. A pull-up or pull-down resistor is connected between the terminal and a power source potential. The pull-up or pull- down resistor...
指内部输出和地之间有个N沟道的MOSFET(Q1),这些器件可以用于电平转换的应用。输出电压由Vcc'决定。Vcc'可以大于输入高电平电压VCC(up-translate)也可以低于输入高电平电压VCC(down-translate)。 某老外的更加透彻的解释 Push-pull输出,实际上内部是用了两个晶体管(transistor),此处分别称为top transistor和bottom trans...
开漏电路就是指以MOSFET的漏极为输出的电路。指内部输出和地之间有个N沟道的MOSFET(Q1),这些器件可以用于电平转换的应用。输出电压由Vcc决定。Vcc可以大于输入高电平电压VCC (call UP-Translate)也可以低于输入高电平电压VCC(call Down-Translate) Open-Drain输出,则是比push-pull少了个top transistor,只有那个bottom...