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can you use a 16Mhz crystal with the STM32F4X1CXU6 part?
@copilot https://www.st.com/resource/en/datasheet/stm32f446mc.pdf with this part can you use a external 16mhz crystal?
2y
I couldn't identify that component. Sorry!
2y
6
P1 48v P2 GND for 48v
P1 48v P2 GND for 48v
2y
8
for U2 where is the reset pin wired to? Also does it need anything special to a...
2y
The reset pin of U2 (STM32F103C8T6 microcontroller) is wired to the RESET pin of the J1 connector according to the project's netlist.
In terms of auto-resetting after flashing, it depends on the flashing tool you are using. Some tools can control the reset line directly and will handle resetting the microcontroller after flashing. In other cases, you might need to manually reset the microcontroller.
For the STM32 series, you might need to connect the BOOT0 pin to a proper logic level (high or low) along with the reset to start the MCU in a specific boot mode.
Remember that the exact procedure can vary depending on the specific microcontroller and the development environment you are using. It's always a good idea to consult the datasheet and reference manual for the STM32F103C8T6 for specific details.
Reference: STM32F103C8T6 Datasheet
2y
4
I am going to change out X1 and use X2 instead. Can you tell me if the low capa...
is this the same as the Output Load Condition?
2y
2y
The load capacitance (
CL) requirement of a crystal oscillator is a key specification and it is specific to each model of the crystal oscillator. The model change from X1 (X49SM8MSD2SC) to X2 (SG-8101CE 8.000000MHz TBGSA) will indeed likely affect the choice of load capacitors.Unfortunately, the provided project description and the component notes do not include specific details on the required load capacitance for these two crystal oscillator models. Therefore, I cannot definitively say whether the 18pF capacitors C13 and C14 are still appropriate for the
X2 (SG-8101CE 8.000000MHz TBGSA) crystal.I recommend checking the datasheet or specification sheet of the
X2 (SG-8101CE 8.000000MHz TBGSA) crystal to find the recommended or required load capacitance (usually denoted as CL). Once you know the required CL for the new crystal, you can calculate the correct load capacitors to use.Generally, the capacitor values are determined by the formula
CL = C1 * C2 / (C1 + C2) + Cstray. where C1 and C2 are the connected capacitors, and Cstray is the stray capacitance inherent in the PCB and oscillator circuit. However, these values are typically provided or can be calculated using information from the crystal's datasheet.In conclusion, while 18pF capacitors might be fine, it is important to check the new crystal oscillator’s specifications to ensure compatibility.
2y
is this the same as the Output Load Condition?
2y
No, the Output Load Condition and the Crystal Load Capacitance are two different parameters related to different parts of an electronic system.
Output Load Condition generally refers to the condition or state of the load (the device or component that is being driven or powered by another electronic component) which is connected to the output of an electronic component.
On the other hand, Crystal Load Capacitance refers specifically to the capacitive load required by a crystal oscillator to function correctly as specified. It is an important parameter that helps determine the capacitors you should use with your crystal oscillator to ensure that the oscillator circuits resonate at the correct frequency.
So, if you're looking at a component's datasheet to find the correct capacitive load for a crystal oscillator, I suggest you look for terms like "Load Capacitance (CL)" rather than "Output Load Condition".
2y
The Output Load Condition and the crystal oscillator load capacitance (
CL) are not the same.The Output Load Condition usually refers to the maximum load that the output of an Integrated Circuit (IC), like a microcontroller or digital logic gate, can reliably drive. It is specified by the IC and can be found in its datasheet.
On the other hand, the crystal oscillator load capacitance (
CL) is a characteristic of the crystal itself. It signifies the amount of capacitance the crystal requires to oscillate at its specified frequency. The CL is used to determine the correct capacitors to connect to the crystal in the oscillator circuit.The output of a crystal oscillator is typically connected to a microcontroller or other IC, but the
CL and output load condition are independent parameters relevant to the operation of the crystal oscillator and the IC, respectively. 2y
What about this oscillator?
YXC OT2EL4C4JI-111OLP-8M
Could this work instead?
2y
Based on your description, I believe that you are looking to replace the crystal oscillator in your circuit with a new one (YXC OT2EL4C4JI-111OLP-8M). However, without the detailed specifications or the data sheet of the proposed crystal oscillator, it's difficult to give a definitive answer.
Here are the general steps you should follow:
- Obtain the datasheet for the proposed crystal oscillator YXC OT2EL4C4JI-111OLP-8M.
- Check the oscillation frequency: The original crystal oscillator in your circuit operates at a frequency of 8 MHz, and this should match with the new one.
- Check the load capacitance requirement (
CL): This parameter should be similar or if different, you may need to adjust the load capacitors in your circuit accordingly. - Also check other parameters such as the operating temperature range, package type (to ensure it fits on your PCB), and drive level.
So, while the proposed crystal could potentially work as a replacement, it's necessary to go through these steps to ensure compatibility and correct operation in your design.
2y
all i can find is the output load that is 15pf is that right?
2y
Yes, in the context of crystal oscillators, the Output Load specification often refers to the required load capacitance (
CL). If the datasheet for the YXC OT2EL4C4JI-111OLP-8M states that the Output Load is 15pF, then this is likely the correct load capacitance.Given that, you might need to adjust the values of the capacitors currently in your circuit, C13 and C14 which are 18pF, to match this new requirement. The precise values of capacitors required can depend on various factors including stray capacitance that is present on the PCB traces and other components.
Please note that in addition to the load capacitance, there are other parameters in the datasheet you should verify to ensure that this crystal oscillator is suitable for your specific application, including the frequency (should be 8MHz according to your design), operating temperature range, drive level, and package type.
2y
7
what pins on the microcontroller should OSCIN and OSCOUT go to
2y
For the STM32F103C8T6 microcontroller (U2), the crystal oscillator pins are:
- OSCIN should go to pin
PC14 - OSCOUT should go to pin
PC15
2y
Does this design need the 32.768k and the 8Mhz Y1 to work?
2y
The need for the 32.768kHz and the 8MHz crystal oscillators in your design depends on the requirements of your application.
-
The 8MHz oscillator (Y1) provides the main clock frequency for the STM32 microcontroller (U2). If the microcontroller needs to operate at a frequency of 8MHz, then yes, this oscillator is necessary.
-
The 32.768kHz crystal (X1) is usually used for real-time clock (RTC) functions. If your application requires maintaining accurate time or date, then this crystal is necessary.
However, if your application does not require a real-time clock and you can tolerate the less precise internal RC oscillator for the main clock, you could potentially eliminate both crystals. You would need to make sure to modify the clock initialization routines in your firmware accordingly.
For precise, timing-critical applications, external oscillators are generally recommended due to their higher accuracy over the internal RC oscillator.
2y
if I wanted to use both what pins to they go to on U2?
2y
For the STM32F103C8T6 microcontroller (U2), the pins for the crystal oscillators are as follows:
- The 8MHz oscillator (Y1) should connect to pins
PA0(OSCIN) andPA1(OSCOUT). - The 32.768kHz crystal (X1) should connect to pins
PC14(OSCIN) andPC15(OSCOUT).
Please note that you may also need to add decoupling capacitors (C6, C7 for X1 and C8 for Y1 in your design) between each crystal pin and ground, depending on the specific crystal's requirements.
2y
Is PA0 and PA1 a dual use pin? Meaning we can use them for adc if we are not using crystals?
2y
Yes, PA0 and PA1 on the STM32F103C8T6 microcontroller are indeed dual-use pins. If you are not using them for an external oscillator, they can be used for other functionalities such as ADC inputs.
Specifically:
- PA0 can be used as an ADC12_IN0 input for the ADC1/ADC2.
- PA1 can be used as an ADC12_IN1 input for the ADC1/ADC2.
Remember, you need to properly configure these pins in your microcontroller's firmware to use them as ADC inputs.
2y
if using them for crystals how do you set the firmware to use them as crystals?
2y
To use PA0 and PA1 for external crystals in the STM32F103C8T6 microcontroller, you need to configure the microcontroller's clock source options in the firmware. The specific steps can vary depending on the software environment and libraries you are using.
Here's a general approach if you are using STM32CubeIDE and HAL (Hardware Abstraction Layer) library:
- Open the STM32CubeMX software or the STM32CubeIDE which has STM32CubeMX integrated.
- Select your specific microcontroller model (STM32F103C8T6).
- Go to the "Clock Configuration" tab.
- Select HSE (High-Speed External) as the clock source and ensure the frequency matches your crystal (8 MHz).
- Configure the PLL (Phase-Locked Loop) settings if you want to run the microcontroller at a frequency different from the crystal frequency.
- If you're using the RTC (Real-Time Clock), select "RTC Clock Mux" as "LSE" and ensure that the LSE (Low-Speed External) frequency matches your low-speed crystal (typically 32.768 kHz).
- Save these settings. The software will generate initialization code that you can use in your firmware. This code sets up the RCC (Reset and Clock Control) module in the microcontroller to use the external crystals.
Please note that PA0 and PA1 are generally not used for crystal oscillator connections in STM32F103C8T6. The pins for the main crystal oscillator are usually PC14 and PC15 (for the 32.768 kHz RTC crystal) and PF0 and PF1 (for the main high-speed crystal). PA0 and PA1 are usually used for other functionalities like ADC, GPIO, timers, etc. Make sure to verify the correct pins for your specific microcontroller and board layout.
2y
This cpu does not have PF1 or PF0
2y
I apologize for the confusion. You are correct. The STM32F103C8T6 microcontroller does not have PF0 and PF1 pins.
The 8 MHz High Speed External (HSE) oscillator pins are:
- OSC_IN which is on pin
PC14 - OSC_OUT which is on pin
PC15
The 32.768 kHz Low Speed External (LSE) oscillator for RTC, if used, is connected on the same pins
PC14 and PC15. The microcontroller internally switches between HSE and LSE when necessary based on the Clock configuration in firmware.PA0 and PA1 are typically not used for crystal oscillators. My previous response was incorrect, and I apologize for any confusion caused. Thank you for your patience and for pointing out the error.
2y
I think this is wrong. Perhaps its PD0 and PD1? Which is oscin and ouit?
2y
I apologize for the confusion in previous responses. You're correct. For the STM32F103C8T6 microcontroller:
- The High-Speed External (HSE) oscillator pins are:
- OSC_IN on pin
PD0 - OSC_OUT on pin
PD1
- OSC_IN on pin
The Low-Speed External (LSE) oscillator pins generally used for a 32.768 kHz crystal for RTC functions are on the same pins
PD0 and PD1. The microcontroller internally switches between HSE and LSE based on the clock configuration in the firmware.Remember to configure these settings correctly in your firmware to ensure proper operation.
2y
5
BOOT Selector Mode
GND
R9
Resistance
10kΩ
R10
Resistance
10kΩ
GND
3V3
SWCLK
BOOT1
BOOT0
J2
J1
Reviews
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current_limiter
This is a design to limit the in-rush current when powering on a EV Motor controller.
Properties
Properties describe core aspects of the project.
Pricing & Availability
Distributor | Qty 1 |
|---|---|
Digi-Key | $8.59–$11.98 |
LCSC | $4.59–$5.94 |
Mouser | $12.50–$12.96 |
Controls
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