topic Do I need to pull-up RESET_b pin in Kinetis Microcontrollers

Do I need to pull-up RESET_b pin

lokuate — Sun, 12 Jan 2014 07:16:46 GMT

even though I disable it in my chip configuration?

My design is not stable, resets under some situations, seems like a hardware issue.

Kindest Regards,

Carlos

Re: Do I need to pull-up RESET_b pin

jeremyzhou — Sun, 12 Jan 2014 10:37:26 GMT

Hi Carlos,

I don't think it's necessary to pull up Reset pin after disable it. Could you tell me whether you had check the RCM_SRSn registers? If not, I suggest you'd better to check the RCM_SRSn registers after reset happens to figure out the source which cause MCU reset.

I'm looking forward to your reply.

Best regards,

Ping

Re: Do I need to pull-up RESET_b pin

Paul_Tian — Mon, 13 Jan 2014 01:16:42 GMT

Hi, Carlos

For hardware design, it is better to add pull-up resistor to reset pin. As you know, there is a internal pull-up resistor in our MCU, but it is only a weak pull-up. So it is recommend to add external one. If your software can run well most time, only will cause reset sometime by unstable reset signal. I think it might cause by non-external pull-up resistor.

Hope my reply can help you.

Best Regards

Paul