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Check that none of the unconnected pins require pull-up or pull-down resistors t...
bruceapplesauce

bruceapplesauce

@copilot Check that none of the unconnected pins require pull-up or pull-down resistors to ensure proper function.
2y

copilot

To determine whether pull-up or pull-down resistors are required, we need to refer to the datasheet of each component and understand the default state and behavior of each unconnected pin.
From your schematic, let's check the chips:
  1. CP2102N-A02-GQFN28 (IC3)
  2. DS3231M+ (IC2)
  3. ESP32-WROOM-32 (U1)
  4. 24AA256T-I_SM (IC1)
  5. PCF8574DWR (U3)
  6. TCA9548APWR (U2)
As I don't have access to up-to-date datasheets here, it would be most beneficial if you could take a look at these specific datasheets.
Although, generally:
  • For CP2102N-A02-GQFN28 (IC3), if not using certain interfaces, relevant pins may be left unconnected.
  • For DS3231M+ (IC2), typically, no additional pull-up or pull-down resistors are needed.
  • For ESP32-WROOM-32 (U1), you should consider adding pull-up or pull-down to BOOT and RESET pins based on your application.
  • For 24AA256T-I_SM (IC1), this EEPROM typically doesn't need additional resistors if not connecting address logic (A0, A1, A2).
  • For PCF8574DWR (U3), consider pull-ups for open-drain I/O pins if you need them to be in a default high state.
  • For TCA9548APWR (U2), the RESET pin (Pin 3) should be pulled high with a resistor (a typical value could be anywhere between 4.7kฮฉ to 10kฮฉ) if not in use.
Remember, these are just general guides. Depending on the specific configuration and devices used, additional pull-up or pull-down resistors may or may not be required in your design. You should verify these details with the datasheets of the specific chips used in your design.
2y
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