Pull-Up at output of MCU

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rhnrgn

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Hello,

According to datasheet of TPS25200 recommends user to use pull-up resistor at enable pin.

I am not sure if there will be any problem or not when i want to output_low when there is an pull-up resistor at output line?

Can you enlight me?

MCU=PIC16F1946

Thank You
 
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I use pull-down resistors at MCU output lines several time but in my new design i will use TPS25200. According to datasheet it recommends user to use pull-up resistor at enable pin
Click to expand...
I see no relation between both statements.
 

rhnrgn said:
I am not sure if there will be any problem or not when i want to output_low when there is an pull-up resistor at output line?

MCU=PIC16F1946
Click to expand...

As I remember the PIC has internal weak pull-ups. you can maybe use them. Or use an external resistor like mentioned and explained in the datasheet of TPS25200.
 
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    rhnrgn

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You just need to size you pull up resistors big enough such that when you want to output a LOW, the current into the pin is not too much.

The datasheet will have the max current a pin can sink. The Vcc/R should be less than this current so that it doesn't damage anything.
 
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    rhnrgn

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In his case, the value of the pull-up res is already defined in the datasheet of TPS25200, 300k. The Pic should be able to sink this small current.
 
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    rhnrgn

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