mkv31, safety PWM state while rebooting

alexeyusoltsev — Wed, 11 Oct 2017 16:11:34 GMT

Well, i got a power converter solution built upon mkv31f128.

But there is a problem-while booting pins that controlls H-brige ringing. That causes periodically the system blow and about 20$ loss to repair it. And of course we can't sell such a product.

So i have a question: are there any fuses/registers that controls states of pins in the boot time before been configured? (at least I can remember such tool on other vendors)

P.S.: Now we solves that problem by introducing time delay before power up power stage but it cost additional money.

Best regards,

Alexey.

Re: mkv31, safety PWM state while rebooting

xiangjun_rong — Thu, 12 Oct 2017 02:57:08 GMT

Hi, Alexey,

As you know that the PWM signals output logic are indeterminate during and after reset, I suggest you connect a pull-down resistor on the PWM output pins so that the PWM can output low logic before you initialize the PWM(FTM ) module.

Most of the PWM pins are input or disabled(float) during and after Reset, so they will become low if you connect pull-down resistor.

Hope it can help you

Xiangjun Rong

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mkv31, safety PWM state while rebooting

Re: mkv31, safety PWM state while rebooting