Fs6503 and FS0B

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Fs6503 and FS0B

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347996379
Contributor III

Hi,Sun

Now, my Fs6503 feed the dog has been normal, I use in my schematic FS0B this pin to control my contactor, at first I didn't notice this place, this pin as long as electricity output low level, whether in the debug mode or normal mode, so that I contact directly is locked, can you help me points for this reason?I have checked the reasons why FS0B may be pulled down in the manual, as shown in the following pictures. I have confirmed that there are no problems with the first three, and the remaining ones are all in a vague state. Please analyze the reasons in combination with my schematic diagram.

pastedImage_1.png

Maybe I should ask you how I can pull the FS0B pin higher after the initialization of the fs6503 is complete.

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6503截图.png

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guoweisun
NXP TechSupport
NXP TechSupport

HI!

FS0B的电路看不清楚,能发清楚的图片吗关于FS0B的电路!

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1,878 Views
347996379
Contributor III

麻烦帮我看看问题出现在哪里,结合上面的问题

1.png

2.png

3.png

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guoweisun
NXP TechSupport
NXP TechSupport

1:No more issue with your schematic.

2: For the release FSXB please read detail information procedure in page57 attached.

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347996379
Contributor III

Hi,sun

I would like to know whether the PIN of FS0B remains low after power on or reset.The software package you provided only has the function of releasing FS0B, but does not have the function of raising it.In addition, in debug mode, the output of FS0B is low or high.

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guoweisun
NXP TechSupport
NXP TechSupport

对的,每次power on reset  FS0B都是默认low的无论再哪个模式下面,所以我才给您release的方法。

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1,880 Views
347996379
Contributor III

非常感谢!现在我已经能够释放FS0B这个管脚了,由于这个管脚我是用来做功能安全的,当CPU不能运行的时候,并停止了喂狗,在fs6503内部fs0b这个管脚有没有主动拉低的机制

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guoweisun
NXP TechSupport
NXP TechSupport

这个SF_OUTPUT_REQUEST register寄存器的FS0B_REQbit 设置成1就是asserted low.

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347996379
Contributor III

可能你没明白我的意思,上面我说到CPU在完全死掉的情况下,主cpu还怎么能去读写sbc的寄存器?在这个时候sbc有没有主动释放fs0b的机制

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guoweisun
NXP TechSupport
NXP TechSupport

CPU都死掉了怎么可能去releaseFS0B!

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347996379
Contributor III

意思是这个管脚不能当做安全功能管脚用了?CPU非正常情况下,fs0b管脚不能锁住控制开关

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guoweisun
NXP TechSupport
NXP TechSupport

如果你不去喂狗,就会产生错误FS0B,这个时候FS0B就会被asserted.你说的锁住控制是怎么理解?

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347996379
Contributor III

发送错误的时候,FS0B的电平被翻转

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guoweisun
NXP TechSupport
NXP TechSupport

有错误是会翻转啊,前提是release了FS0B,这不就是安全功能吗?

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1,880 Views
347996379
Contributor III

明白了,谢谢

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