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Does a CPLD Input source current ? When I measure the voltage
at my CPLD input pin, it is somewhere in the 3V range. When I connect
it to ground, it sources about 50 mA. Is that normal ? I thought an
input should not behave like this ..!?
Yes, this is driving me mad ....I would call that an output, or a broken input.
You could clarify if your 50mA meant 50 microamps, orI would call that an output, or a broken input.
Yes, this is driving me mad ....
It is configured as input, and it WORKS as input. If I
pull it down to ground, the logic detects the low level.
Could it still be broken ? How could I break an input ?
There are only 5V on the board ....And the rest of the
chip works just fine ....
it is 0.050 A or 50 milliampsYou could clarify if your 50mA meant 50 microamps, or
50 milliamps. Many times I've seen the greek 'u' in uA
morph into mA on the internet as it jumps fonts....
50uA could be a normal pin pullup, 50mA sounds like
the PFET is on.
Thanks I will do that.A simple test is to try moving the function to another pin,
or simply swap the pin allocates (two same-class pins).
code is very simple:If the problem stays with the pin, it's likely to be
chip related, if it moves with the function, suspect something
in your code...
You could clarify if your 50mA meant 50 microamps, or
50 milliamps. Many times I've seen the greek 'u' in uA
morph into mA on the internet as it jumps fonts....
50uA could be a normal pin pullup, 50mA sounds like
the PFET is on.
it is 0.050 A or 50 milliamps
A simple test is to try moving the function to another pin,
or simply swap the pin allocates (two same-class pins).
Thanks I will do that.
If the problem stays with the pin, it's likely to be
chip related, if it moves with the function, suspect something
in your code...
code is very simple:
VCC_SENSE: in std_logic; -- sense power
Here's a weird thought... Try VOLT_SENSE: in
-- sense power
"Hans Maier" <Hans@Maier.com> wrote in message
news:1f8t80lcr6kj8ghv4dao4qb6spbfhvrct1@4ax.com...
You could clarify if your 50mA meant 50 microamps, or
50 milliamps. Many times I've seen the greek 'u' in uA
morph into mA on the internet as it jumps fonts....
50uA could be a normal pin pullup, 50mA sounds like
the PFET is on.
it is 0.050 A or 50 milliamps
A simple test is to try moving the function to another pin,
or simply swap the pin allocates (two same-class pins).
Thanks I will do that.
If the problem stays with the pin, it's likely to be
chip related, if it moves with the function, suspect something
in your code...
code is very simple:
VCC_SENSE: in std_logic; -- sense power