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what crystall can we use??
painone

painone

@copilot what crystall can we use??
2y

copilot

For the PIC16F887 microcontroller (U1), you typically need a crystal oscillator to provide an external clock signal, especially if your application requires a stable and precise clock source. The PIC16F887 can operate at up to 20MHz, so you'll want a crystal within its operating frequency range but also consider your application's specific needs for timing accuracy and stability.
Given the information, here is a suggestion that considers a common scenario:
  • Crystal Frequency: 8MHz or 16MHz are popular choices, providing a balance between speed and power consumption. These frequencies are also well within the operating range of the PIC16F887 and are readily available.
  • Load Capacitance: Typically, crystals specify a load capacitance, often around 18pF to 22pF. Ensure that the crystal's specified load capacitance matches the circuit design, including the capacitance of the microcontroller's input pins and any additional capacitance you might add externally.
Assuming a choice of an 8MHz crystal with a load capacitance of 20pF, you would:
  • Connect the crystal across pins 13 (RA7/OSC1/CLKIN) and 14 (RA6/OSC2/CLKOUT) of the PIC16F887 (U1).
  • Add two load capacitors (let's designate them C1 and C2, values depending on the crystal's specifications, typically around 22pF) from each of the crystal pins to ground.
Based on the above, the connections would be:
  • Connect the crystal to U1:13 (RA7/OSC1/CLKIN) and U1:14 (RA6/OSC2/CLKOUT).
  • Connect C1:1 to U1:13 and C1:2 to ground.
  • Connect C2:1 to U1:14 and C2:2 to ground.
Adjust the capacitor values according to the crystal's datasheet for optimal performance. Remember, the exact frequency and capacitors you choose should align with your project's specific requirements for timing and precision.
2y
1
U1

Reviews

  • Ground
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    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
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    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
    jharwinbarrozo
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  • Generic Resistor
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    jharwinbarrozo
    1.5M
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
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  • Generic Inductor
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  • RMCF0805JT47K0
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    General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
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