I'm designing a USB to I2S digital audio interface, and I'm not sure about my circuit design. Could my peripheral circuit design meet the demand of i.MXRT 1010, especially for POR circuit and power supply? The schematic is given in the attachment(some temporary unused peripheral eg. FUSB302 was left unconnected).
It is Okay to choose the RESET IC if its threadhold is about 2.7V.
Thanks for your reply!
For the first problem, I will remove the pull-up resistor on POR_B. But for the second problem, UM803RS is rather hard for me to get. Is there any replacement for UM803? And, will LM809 work for the POR circuit?
Pleased download I.MXRT1010-EVK board files from its offical webiste, https://www.nxp.com/webapp/Download?colCode=IMXRT1010-EVK-DESIGN-FILES
1. The POR_B already has an internal pull-up (details in Reference Manual, section 21.5.1, page 745), so there's no need to pull-up here again.
2. You used anthoer RESET IC to instead of default UM803RS(threadhold is 2.7V, it means if the supply drop down to 2.7V, it will output to POR_B to make system reset)from EVK board, https://www.nxp.com/docs/en/data-sheet/IMXRT1010IEC.pdf
B.R,
Sam