The boot mode config-pins have pull-down resistors 100k on reset, right?
So we don't have to put external pull-down resistors, if we want the corresponding bit should be 0.
But, why are on the Evaluation-board pull-ups and pull-down resistors??
My question: Can/ should/ must I put external Pull-down resistors, if I want the corresponding config bit must be 0?
Hello René,
For BOOT_MODE1 and BOOT_MODE0, use one of these options to achieve logic 0:
• Tie to GND through any-value external resistor
• Tie directly to GND
A value of 4.7 kohm is preferred for high-noise environments.
For further information I highly recommend you to check the i.MX RT Hardware Development Guide for the MIMXRT1050/MIMXRT1060 Processor.
Hope it helps!
Best regards,
Felipe
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...and what about the BOOT OPTIONS Pin values on GPIO_B0_04/05.../15?? Again my question: Can/ should/ must I put external Pull-down resistors, if I want the corresponding config bit (also on GPIO_B0_04 etc.) must be 0?
Best regards
Rene
Hi Felipe,
I understand: it's recommended to put external resistors in case of noise.
but if I understand this correct:
For example: GPIO_B0_04 has internal 100k pull-down on reset state. So this would be read as '0' after reset, if there is not to much noise, and the desired boot mode configuration is set.
I think, that's the reason for these pull-down resistors on reset state, that you don't have to put a lot of external resistors, if you just want this pin on Low-Level after Reset, right?
Hi René,
Please check the below note from Hardware Development Guide.
The BT_CFG[] signals are required for a proper functionality and operation and shall not be left floating during development if BT_CFG[] fuses and BT_FUSE_SEL are not configured.
Regards,
Felipe