Reset pin : How to?

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Reset pin : How to?

664 Views
Jin
Contributor I

Dear Sir,

I am using "Kinetis KL24 :64-pin LQFP," but I've noticed the following problems.

In terms of the open state "RESET_b" terminal, about 1.5 ~ 1.7v about has been brought out.

This pin is in the input?

Why is the output?

In this case, the external reset circuit, connected to only the switch?

Meaning I do not know!

The correct, please tell me the reset circuit!

Best Regards,

Jin.

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6 Replies

89 Views
Ben
Senior Contributor I

Jin, it is normal to see a voltage there as there is  a weak pull-up inside the chip.

Using this pin for RESET, freescale recommend to put an external pull up (4.7K-10K) and a small filter capacitor to ground.

I don't recommend to use switch only.

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Jin
Contributor I

Dear Ben

Dear Ben,

Thank you for answer.

You have an external pull-up in 3.3v/10k but reset pin is the level of about 1.5v.

I'm debugging code Warrior, but this reset does not work decent factor.

I want to see the reset circuit!

Additional Information: condenser is using the "0.1uF".

And.....

Please let me know the specific value of "small filter capacitor to ground."

Best Regards,

Jin.

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89 Views
egoodii
Senior Contributor III

If you are measuring this voltage on the !RESET pin with a voltmeter, you can be assured it is NOT a static condition, but is toggling between 'HI' and 'LOW' in a continuous reset-loop, most likely due to default 'watchdog on' activity (part not programmed properly--no valid reset vector?).

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89 Views
Jin
Contributor I

Dear Ben,

Thank you for answer.

You have an external pull-up in 3.3v/10k but reset pin is the level of about 1.5v.

I'm debugging code Warrior, but this reset does not work decent factor.

I want to see the reset circuit!

Best Refards,

Jin.

0 Kudos

89 Views
Jin
Contributor I

Additional Information: condenser is using the "0.1uF".

Best Regards,

Jin.

0 Kudos

89 Views
Jin
Contributor I

Dear Ben,

Please let me know the specific value of "small filter capacitor to ground."

Best Regards,

Jin.

0 Kudos