Hello,
Please answer following questions from customer.
Customer tested the /RES behavior when VB down to 5V and VCC is around VCCUV voltage using their prototype board.
Result is attached file.
(Please visit the site to view this file)
/RES goes low detecting VCCUV, then CPU load current decreased because of /RES=Low and VCC rose up so /RES return to high. Assert and de-assert of /RES is repeated.
They feel that VCCUVHY is not working and VCC load regulation is not good when VB < 5.5V.
And they want to know the design concept of VCCUVHYS voltage and /RES behavior while low VB.
Q1: Please advise if above /RES behavior is within expectation.
Q2: Please advise why load regulation gets worth with customer’s experiment condition (VB = 5V).
Q3: Please advise workaround not to repeat assertion and de-assertion of /RES.
Best Regards.