Bob,
Thanks.
I’ll look at the 570 data sheet and see what it says about pullup resistance.
An input can be configured with either a pullup, pulldown or nothing.
Want to start a group pool to bet on how many iterations it will take to get the configuration correct?
Not that difficult but easy to loose ones place going between your pin chart and the HCG settings.
73,
Jim McCullers
WA4CWI
Jim,
Yes need to be sure the pull ups are enabled on these IRQ lines which will be inputs.
Ok to have pull ups on all inputs. If we have a problem meeting the Vol input level we can disable later.
Pull-ups are probably a high resistance, maybe 100K?
I have several external pull ups and a few pull downs.
POR could be a special case but we can start with pull-up.
Bob
On Nov 19, 2023, at 7:07 AM, Burns Fisher (AMSAT) via pacsat-dev <pacsat-dev@amsat.org mailto:pacsat-dev@amsat.org > wrote:
You should double check this but I seem to remember that the internal pull-up/downs only work for INPUTS. Not sure if for example they would work on i2c. FWIW
On Sat, Nov 18, 2023 at 10:41 PM Jim McCullers via pacsat-dev <pacsat-dev@amsat.org mailto:pacsat-dev@amsat.org > wrote:
Bob,
In the last column labeled Pullup/Down does “Add on chip pullup” mean set the pullup with the HCG configuration?
My assumption is yes but wanted to crosscheck before defining.
The configurator assigns a pullup to all inputs by default.
If not required I assumption they will need to be manually reset in HCG.
Thanks
Jim McCullers
WA4CWI
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Jim McCullers