Question about Part of i.MX6Dual Lite Sabre B'd.

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Question about Part of i.MX6Dual Lite Sabre B'd.

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inhojeon
Contributor III

Hi, All !

I Have a question.

Is it must use 15.4K(1%) for R530 & use 28k(1%) R533 (attach a file R530.pdf. that is Sabre Bd)?

and, Is it possible use 15k(1%) for R530 & 27k(5% or 1%) R533?

Best Regards,

Inho Jeon.

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Yuri
NXP TechSupport
NXP TechSupport

Hello,

  According to STM6315 Datasheet, for the reset circuit  STM6315RA  :
Reset Threshold Voltage = 2.63 V

RST Pulse Width = 1.5 ms.

http://www.st.com/web/en/resource/technical/document/datasheet/CD00081393.pdf

  So, for R533 = 28 KOhm  and R530=15.4 KOhm

VCC  = P5V0 * R530 /(R533+R530) = 1.77 V.

  It is enough to power the Voltage Supervisor STM6315 initially, but

does not allow it to reach the threshold. Note : the 3.3V power is the final voltage in the power sequence.

This will trip the threshold and begin the time-out for POR release.  If 15KOhm is used instead of 15.4 KOhm :

VCC = 1.74 V

This is less than threshold 2.63 V and is OK.


Have a great day,
Yuri

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138 Views
Yuri
NXP TechSupport
NXP TechSupport

Hello,

  According to STM6315 Datasheet, for the reset circuit  STM6315RA  :
Reset Threshold Voltage = 2.63 V

RST Pulse Width = 1.5 ms.

http://www.st.com/web/en/resource/technical/document/datasheet/CD00081393.pdf

  So, for R533 = 28 KOhm  and R530=15.4 KOhm

VCC  = P5V0 * R530 /(R533+R530) = 1.77 V.

  It is enough to power the Voltage Supervisor STM6315 initially, but

does not allow it to reach the threshold. Note : the 3.3V power is the final voltage in the power sequence.

This will trip the threshold and begin the time-out for POR release.  If 15KOhm is used instead of 15.4 KOhm :

VCC = 1.74 V

This is less than threshold 2.63 V and is OK.


Have a great day,
Yuri

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

View solution in original post

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