hello,
could u advise what the value of internal pull up and pull down resistor value for lpc804 is? thanks!
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Hi,
The pull-up and pull-down are not passive resistors but active current sources (they typically deliver around 50µA when enabled) that is why there is not a precise value for them. Please refer to the "Ipu"/"Ipd" and "Vi" characteristics in the LPC804 data sheet (Electrical pin characteristics, located at the Table 14, page 48):
So for example, if a pin at pull-down has a typical Vi of 5V, the current would be of 50µA and therefore the internal resistor value would be of 100 KOhms.
I hope this information can help you, and please ask if you have any more doubts.
Ricardo Delsordo.
how to configure the IOCON register and how to enable the pull down in pio0-7 in lpc804? give the example
Hi,
The pull-up and pull-down are not passive resistors but active current sources (they typically deliver around 50µA when enabled) that is why there is not a precise value for them. Please refer to the "Ipu"/"Ipd" and "Vi" characteristics in the LPC804 data sheet (Electrical pin characteristics, located at the Table 14, page 48):
So for example, if a pin at pull-down has a typical Vi of 5V, the current would be of 50µA and therefore the internal resistor value would be of 100 KOhms.
I hope this information can help you, and please ask if you have any more doubts.
Ricardo Delsordo.
thanks Ricardo...