topic Does KL03 need a pullup resistor on reset pin in Kinetis Microcontrollers

Does KL03 need a pullup resistor on reset pin

tedmawson — Tue, 26 Apr 2016 19:49:02 GMT

I designed a PCB that takes the MKL03Z32CAF4, I thought the reset pin had an internal pull up resistor but now I'm not sure. Does it? Is there a document that describes things such as this and the minimum requirements?

Re: Does KL03 need a pullup resistor on reset pin

Robin_Shen — Wed, 27 Apr 2016 02:16:57 GMT

Hi Ted,

The RESET_b pin, if enabled, should have a 100 nF capacitor close to the MCU for transient protection. When enabled as it's default function, has a weak internal pullup, but an external 4.7 kΩ to 10 kΩ pullup is recommended.

For more detail, please refer Kinetis L Peripheral Module Quick Reference.

Best Regards,

Robin

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Re: Does KL03 need a pullup resistor on reset pin

tedmawson — Wed, 27 Apr 2016 13:17:54 GMT

Robin,

Thanks for the clarification. I'm trying to make my hardware start up reliably so, given I'm using the KSDK (without PE), what is the recommended way to apply/configure the digital filter available in the RCM_RPFC register. I'm hoping that doing this will allow my prototype PCBs to start up reliably but I will add the components suggested for the next spin.

Ted

Re: Does KL03 need a pullup resistor on reset pin

Robin_Shen — Thu, 28 Apr 2016 03:06:19 GMT

Hi Ted,

If you are using SDK_1.3_FRDM-KL03Z download from Kinetis SDK Builder (REV 2 & 1.3).

You can search "RESET Pin filter" in Kinetis SDK v.1.3 API Reference Manual.pdf. (for example ...\SDK_1.3_FRDM-KL03Z\doc)

The function RCM_HAL_SetResetPinFilterConfig() can be found in such folder. (for example ...\SDK_1.3_FRDM-KL03Z\platform\hal\src\rcm)

Best Regards,

Robin