Hello,
In IMX8MDQLQIEC, there are two different number for PD/PU resistor values.
Table 26 says,
30 x 0.75 Kohms (min) , 30 Kohms(typ), 30 x 1.25 Kohms(max.) for PU.
95 x 0.75 Kohms (min) , 95Kohms(typ), 95 x 1.25 Kohms(max) for PD.
Table 84 says
90 Kohms(PD)
27 Kohms(PU)
** It says GPIO1_IO02 has 27Kohms PD. It seems to be typo.
If the table 84 refers to typ value in Table 26, it make sense.
I understand that PU/PD on silicon are not so accurate, so these small difference doesn't matter for NXP.
But the values should be the same and consistent to avoid confusion at your customer's site.
Can we take PD/PU resistor value in Table 26 as your authorized value?
Thanks,
Norihiro Michigami
AVNET
Solved! Go to Solution.
Hello,
The Datasheet table 26 (GPIO DC parameters) is correct regarding pull-up resistor 30K +/- 0.25K
and pull-down resistor 95K +/- 0.25K.
As for the GPIO1_IO02: customers can use IOMUXC registers, in particular -
IOMUXC_SW_PAD_CTL_PAD_GPIO1_IO02 - to define what pins have internal 27K Ohm
pull up resistor enabled. The bit PUE of IOMUXC_SW_PAD_CTL_PAD_GPIO1_IO02 is set.
Note, i.MX8M GPIOs have internal PD(90K), which can’t be disabled
Have a great day,
Yuri
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Hello Yuri,
Thank you for your reply.
I understood that default value of PUE bit for IOMUXC_SW_PAD_CTL_PAD_GPIO1_IO02 is enabled whereas
PUE for other GPIO is disabled basically.
Thanks,
Norihiro Michigami
AVNET
Hello,
The Datasheet table 26 (GPIO DC parameters) is correct regarding pull-up resistor 30K +/- 0.25K
and pull-down resistor 95K +/- 0.25K.
As for the GPIO1_IO02: customers can use IOMUXC registers, in particular -
IOMUXC_SW_PAD_CTL_PAD_GPIO1_IO02 - to define what pins have internal 27K Ohm
pull up resistor enabled. The bit PUE of IOMUXC_SW_PAD_CTL_PAD_GPIO1_IO02 is set.
Note, i.MX8M GPIOs have internal PD(90K), which can’t be disabled
Have a great day,
Yuri
-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!
- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
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