MMPF0100 RESETBMCU impedance.

cancel
Showing results for 
Search instead for 
Did you mean: 

MMPF0100 RESETBMCU impedance.

Jump to solution
201 Views
satoshishimoda
Senior Contributor I

Hi community,

Our partner have a question about MMPF0100 specification.

To decide the pull-up resistor value, they want to know the impedance of RESETBMCU pin.

You know the voltage level is decided by voltage dividing between pull-up resistor and pin impedance.

For example, if RESETBMCPU impedance = 70k ohm, the pull-up resistor value should be up to 30k ohm for i.MX6.

Certainly, we know the pull-up resistor value on the SABRE board (10.0k ohm) is a solution, but the impedance is required to decide the pull-up value strictly for a custom board that RESETBCMU is connected to not only i.MX6 but also other chip.

Would you let me know it?

Best Regards,

Satoshi Shimoda

0 Kudos
1 Solution
118 Views
igorpadykov
NXP TechSupport
NXP TechSupport

Hi Satoshi

when RESETBMCU is high (this is open drain output)

its impedance is big, though it is not specified by

datasheet, probably more Mohms.

Best regards

igor

View solution in original post

3 Replies
118 Views
igorpadykov
NXP TechSupport
NXP TechSupport

Hi Satoshi

according to datasheet p.13

MMPF0100.jpg

2mA/0.4V --> max.200 Ohm impedance

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

118 Views
satoshishimoda
Senior Contributor I

Hi Igor,

Thank you for your reply.

OK, I understood the value when RESETBMCU is low.

Then, how about when RESETBMCU is high?

I think the impedance when it is high is huge value since the internal transistor is OFF, and maybe the impedance does not affect the external resistor value, but would you let me know to make sure?

Best Regards,

Satoshi Shimoda

0 Kudos
119 Views
igorpadykov
NXP TechSupport
NXP TechSupport

Hi Satoshi

when RESETBMCU is high (this is open drain output)

its impedance is big, though it is not specified by

datasheet, probably more Mohms.

Best regards

igor

View solution in original post