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Check that none of the unconnected pins require pull-up or pull-down resistors t...
peetac23

peetac23

@copilot Check that none of the unconnected pins require pull-up or pull-down resistors to ensure proper function.
1y

copilot

To determine if any unconnected pins on your components require pull-up or pull-down resistors, let's review the key components in your project:
  1. STM32F722RET6 (IC1): The unconnected pins are typically GPIO pins. Depending on your application, you may want pull-up or pull-down resistors on GPIO pins if they are left floating to define their state when not driven. Important configuration pins:
    • BOOT0 (Pin 60): Often requires a pull-down resistor if not used, to ensure the microcontroller boots from the main flash memory.
  2. w25Q128JVSIQ (U1):
    • Pins like ~CS, DO(IO1), DI(IO0), and CLK should be connected to the microcontroller or require pull-up resistors to maintain their inactive state when not driven.
  3. Other components: Generally, pull-up or pull-down resistors are often used on inputs or outputs that might float and cause undefined behavior. For the remaining unconnected pins, ensure you check the datasheets if they should have a defined logic state when not connected in your design.
Here are specific recommendations:
  • BOOT0 on IC1: If it's not being used in your application, add a pull-down resistor, often around 10kΩ.
  • Unused GPIO pins: Configure them as inputs with pull-up or pull-down resistors, or set them as outputs driving a defined state.
If you have specific pins in mind that you're concerned about, please point them out, and we can check them for specific needs.
1y
peetac23

peetac23

so should cs be connected to boot0
1y

copilot

No, the U1 (~Chip Select) pin on the W25Q128JVSIQ should not be connected directly to the BOOT0 pin on the STM32F722RET6.
Here's why:
  • U1 Pin: This pin is used to select the flash memory device for communication. It should typically be controlled by a GPIO pin on the microcontroller to enable/disable the device when needed.
  • BOOT0 Pin: This pin determines the boot mode of the STM32 microcontroller. It usually requires a specific configuration (often a pull-down resistor) to ensure the microcontroller starts from the desired memory location during boot-up.
Connecting U1 to a GPIO on the STM32 allows you to control when the flash memory is active. Meanwhile, ensure that BOOT0 is pulled down to ensure the correct boot mode for your application unless you've configured it differently.
Let me know if you have additional questions or need further clarification on other connections!
1y
3
C2
Capacitance
Capacitance
C6
Capacitance
Capacitance
C5
Capacitance
0.22uF
IC1
C4
Capacitance
0.22uF
C3
Capacitance
Capacitance
U3
R6
Resistance
500 Ω
R4
U1
R5
Resistance
500 Ω
R2
Resistance
5.1kΩ
J1
U2
R1
Resistance
5.1kΩ
J2
R3
SW1

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