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.
Solved! Go to Solution.
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!
-----------------------------------------------------------------------------------------------------------------------
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!
-----------------------------------------------------------------------------------------------------------------------