LPC1778FET208 GPIO Current Output

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LPC1778FET208 GPIO Current Output

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Contributor I

Hi,

How much current we can draw from GPIO port pins in LPC1778FET208.

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NXP TechSupport
NXP TechSupport

Hi, Venkatesh,

The source current means the GPIO outputting current when the GPIO pin outputs logic high, the higher the source current is, the higher voltage drop is. The 4mA current means that we can guarantee that the voltage drop is less than 400mV when the source current is 4mA.

I copy the Fig from the data sheet of LPC177x. which can be downloaded from the link:

https://www.nxp.com.cn/docs/en/data-sheet/LPC178X_7X.pdf

 

The sink current is the current the pin draws when the GPIO pin outputs LOW logic. The higher the sink current is, the higher the GPIO pin voltage is. The 4mA sink current means that we can guarantee the pin voltage rising is less than 400mV when the pin draws 4mA current.

 

Hope it can help you

 

xiangjun_rong_0-1603334966427.png

 

 

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NXP TechSupport
NXP TechSupport

Hi, Friend,

Pls refer to Table 13. Static characteristics … in data sheet of LPC177x, both the source/sink current is 4mA.

 
 

source_sinkCurrent.png

Hope it can help you

BR

XiangJun Rong

 
 

 

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Contributor I

Hi Xiangjun,

Thanks for your kind reply, in datasheet it is mentioned only minimum current this means we can able to draw 4mA maximum.

 

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NXP TechSupport
NXP TechSupport

Hi, Venkatesh,

The source current means the GPIO outputting current when the GPIO pin outputs logic high, the higher the source current is, the higher voltage drop is. The 4mA current means that we can guarantee that the voltage drop is less than 400mV when the source current is 4mA.

I copy the Fig from the data sheet of LPC177x. which can be downloaded from the link:

https://www.nxp.com.cn/docs/en/data-sheet/LPC178X_7X.pdf

 

The sink current is the current the pin draws when the GPIO pin outputs LOW logic. The higher the sink current is, the higher the GPIO pin voltage is. The 4mA sink current means that we can guarantee the pin voltage rising is less than 400mV when the pin draws 4mA current.

 

Hope it can help you

 

xiangjun_rong_0-1603334966427.png

 

 

View solution in original post

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