Beagleboard-xM DM3730 IO Pin max current?

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1

Hello,

So I think I've got this right, but I want to make sure.
After reading: http://focus.ti.com/lit/ds/symlink/dm3730.pdf on page 117 I see the following:

Table 3-1. Absolute Maximum Rating over Junction Temperature Range

I(clamp) Clamp current for an input or output ?20 20 mA

Is this saying that any single IO PIN/BALL can source and sink at most 20mA?

Thanks,
Jim

2

Ok read some more of that document. And on page 26 I see some charts that indicate "Output buffer strength" for the various balls/pins. For the various GPIO pins I see numbers ranging from 1,4 and 8 mA.

So I guess I'm a bit confused. How much can any given GPIO pin source and sink?
Sink 20mA, source either 1,4 or 8mA depending upon the pin?

What document and section do I find this information?

Thank you again,
Jim

Hello,

So I think I've got this right, but I want to make sure.
After reading: http://focus.ti.com/lit/ds/symlink/dm3730.pdf on page 117 I see the following:

Table 3-1. Absolute Maximum Rating over Junction Temperature Range

I(clamp) Clamp current for an input or output ?20 20 mA

Is this saying that any single IO PIN/BALL can source and sink at most 20mA?

Thanks,
Jim

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3

Some of the pins can vary based on the selected drive strength via the SW. So, making a general statement as to the current drive strength of the pins is not a good way to look at it. If you want the pin to drive an LED, then it won’t. 8mA is generally speaking the max it can drive. There is a a number that is stated as to the max you can try to rive it without damage. The information is found in the datasheet on a per pin basis.

Gerald

4

Thanks Gerald. How much can the GPIO pins sink?

I appreciate your help.

Regards,
Jim

Some of the pins can vary based on the selected drive strength via the SW.
So, making a general statement as to the current drive strength of the pins
is not a good way to look at it. If you want the pin to drive an LED, then
it won't. 8mA is generally speaking the max it can drive. There is a a
number that is stated as to the max you can try to rive it without damage.
The information is found in the datasheet on a per pin basis.

Gerald

Ok read some more of that document. And on page 26 I see some charts that
indicate "Output buffer strength" for the various balls/pins. For the
various GPIO pins I see numbers ranging from 1,4 and 8 mA.

So I guess I'm a bit confused. How much can any given GPIO pin source and
sink?
Sink 20mA, source either 1,4 or 8mA depending upon the pin?

What document and section do I find this information?

Thank you again,
Jim

Hello,

So I think I've got this right, but I want to make sure.
After reading: http://focus.ti.com/lit/ds/symlink/dm3730.pdf on page 117
I see the following:

Table 3-1. Absolute Maximum Rating over Junction Temperature Range

I(clamp) Clamp current for an input or output ?20 20 mA

Is this saying that any single IO PIN/BALL can source and sink at most
20mA?

Thanks,
Jim

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5

Most all pins can be a GPIO pin, but they are other functionsas well. Best case is 8mA.

Gerald