Плата OSD на базе компонента AT7456E, разводка платы на основе готовых данных

Прошивка не треба, тільки розведення плати.

Детальний опис компонентів які треба встановити на плату та розвести. 

Розмір мінімально можливий, всі компоненти на одній стороні плати.

Приклади готової плати 
Детальний опис (англійською мовою, можу розписати українською).

• Interfaces with the Orange Cube via UART (MAVLink2) using a JST-GH connector.
• Uses an STM32F030F4P6 to bridge UART to SPI for the AT7456E OSD chip.
• Overlays flight data on an analog video signal (NTSC/PAL).
• Connects to an FPV camera (video in) and VTX (video out).
• Operates on 3.3V derived from the Cube’s 5V supply.

1. AT7456E OSD Chip
   • LCSC Part: C82351
   • Specs: SOP-28, 3.3V–5V, SPI interface, NTSC/PAL video overlay
   • Price: ~$2.66
   • Quantity: 1
2. STM32F030F4P6 Microcontroller
   • LCSC Part: C111182
   • Specs: TSSOP-20, 2.4V–3.6V, UART1, SPI1
   • Price: ~$0.60
   • Quantity: 1
3. 27 MHz Crystal Oscillator
   • LCSC Part: C16783
   • Specs: 3.2 mm x 2.5 mm SMD, 27 MHz, 20 pF
   • Price: ~$0.10
   • Quantity: 1
4. Crystal Load Capacitors (22 pF)
   • LCSC Part: C1304
   • Specs: 0603 SMD, 22 pF, 50V, C0G/NP0
   • Price: ~$0.01
   • Quantity: 2
5. Power Regulator (AMS1117-3.3)
   • LCSC Part: C84899
   • Specs: SOT-223, 5V in, 3.3V out, 1A
   • Price: ~$0.08
   • Quantity: 1
6. Decoupling Capacitors (100 nF)
   • LCSC Part: C1350
   • Specs: 0603 SMD, 100 nF, 50V, X7R
   • Price: ~$0.01
   • Quantity: 3
7. Decoupling Capacitor (10 µF)
   • LCSC Part: C15849
   • Specs: 0805 SMD, 10 µF, 25V, X5R
   • Price: ~$0.03
   • Quantity: 1
8. Video Termination Resistors (75 ohms)
   • LCSC Part: C25804
   • Specs: 0603 SMD, 75 ohms, 1%, 1/10W
   • Price: ~$0.01
   • Quantity: 2
9. Video Coupling Capacitor (22 µF)
   • LCSC Part: C15189
   • Specs: 1206 SMD, 22 µF, 16V, X5R
   • Price: ~$0.06
   • Quantity: 1
10. Pull-Up Resistor (10 kΩ, Optional)
    • LCSC Part: C25695
    • Specs: 0603 SMD, 10 kΩ, 5%, 1/10W
    • Price: ~$0.01
    • Quantity: 1
11. UART Connector (4-pin JST-GH)
    • LCSC Part: C2986198
    • Specs: 1.25 mm pitch, SMD
    • Price: ~$0.30
    • Quantity: 1
12. Video Input Connector (3-pin JST-SH)
    • LCSC Part: C168977
    • Specs: 1.0 mm pitch, SMD
    • Price: ~$0.15
    • Quantity: 1
13. Video Output Connector (3-pin JST-SH)
    • LCSC Part: C168977
    • Specs: 1.0 mm pitch, SMD
    • Price: ~$0.15
    • Quantity: 1

• Pin 1 (VIN): Video input from FPV camera.
• Pin 2–10: NC (not connected) or internal use; leave unconnected.
• Pin 11 (OSC1): Crystal oscillator input.
• Pin 12 (OSC2): Crystal oscillator output.
• Pin 13 (GND): Ground.
• Pin 14 (VDD): Power supply (3.3V from AMS1117).
• Pin 15–22: NC or internal; leave unconnected.
• Pin 23 (SCK): SPI clock from STM32.
• Pin 24 (MOSI/SDIN): SPI data in from STM32.
• Pin 25 (MISO/SDOUT): SPI data out (not used, leave unconnected).
• Pin 26 (CS): SPI chip select from STM32.
• Pin 27 (NC): Not connected.
• Pin 28 (VOUT): Video output to VTX.

1. Power:
   • Pin 14 (VDD) to AMS1117-3.3 (C84899) output (3.3V).
   • Pin 13 (GND) to ground plane.
   • 100 nF (C1350) between Pin 14 and Pin 13, placed <5 mm from chip.
2. Crystal Oscillator:
   • 27 MHz crystal (C16783) between Pin 11 (OSC1) and Pin 12 (OSC2).
   • 22 pF (C1304) from Pin 11 to GND.
   • 22 pF (C1304) from Pin 12 to GND.
   • Traces <5 mm, symmetric, close to chip.
3. SPI Interface:
   • Pin 23 (SCK) to STM32 PA5 (C111182, Pin 8, SPI1_SCK).
   • Pin 24 (MOSI) to STM32 PA7 (C111182, Pin 10, SPI1_MOSI).
   • Pin 26 (CS) to STM32 PA4 (C111182, Pin 7, SPI1_NSS).
   • Pin 25 (MISO) unconnected (not required for OSD).
   • Traces <5 mm, grouped, away from video lines.
4. Video Path:
   • Pin 1 (VIN) to Video Input connector (C168977) Pin 1.
   • 75-ohm (C25804) between Pin 1 and GND, near connector.
   • Pin 28 (VOUT) to 22 µF (C15189) positive leg.
   • 22 µF negative leg to Video Output connector (C168977) Pin 1.
   • 75-ohm (C25804) between Pin 28 and GND, near connector.

1. Power Distribution:
   • UART connector (C2986198) Pin 1 (5V) to AMS1117-3.3 (C84899) input.
   • AMS1117 GND to ground plane (UART Pin 4).
   • AMS1117 output (3.3V) to:
     • AT7456E VDD (Pin 14).
     • STM32 VDD (C111182, Pin 1).
   • 100 nF (C1350) and 10 µF (C15849) near AMS1117 (input and output).
   • 100 nF (C1350) near AT7456E VDD.
   • 100 nF (C1350) near STM32 VDD.
2. UART Interface (MAVLink2):
   • UART connector Pin 2 (Cube TX) to STM32 PA10 (C111182, Pin 18, UART1_RX).
   • UART Pin 4 (GND) to STM32 VSS (Pin 20).
   • Optional 10 kΩ (C25695) from PA10 to 3.3V.
3. SPI Interface (STM32 to AT7456E):
   • STM32 PA5 (Pin 8) to AT7456E SCK (Pin 23).
   • STM32 PA7 (Pin 10) to AT7456E MOSI (Pin 24).
   • STM32 PA4 (Pin 7) to AT7456E CS (Pin 26).
   • AT7456E MISO (Pin 25) unconnected.
4. Video Path:
   • Video Input (C168977) Pin 1 to AT7456E VIN (Pin 1).
   • 75-ohm (C25804) at VIN to GND.
   • AT7456E VOUT (Pin 28) to 22 µF (C15189) positive.
   • 22 µF negative to Video Output (C168977) Pin 1.
   • 75-ohm (C25804) at VOUT to GND.
5. Grounding:
   • AT7456E GND (Pin 13), STM32 VSS (Pin 20), UART Pin 4, video connectors’ GND (Pin 2) to ground plane.
   • Vias for multi-layer connectivity.

• Size: ~20 mm x 25 mm (2-layer).
• Placement:
  • AT7456E (C82351) center (SOP-28, ~18 mm wide).
  • Crystal (C16783) + caps (C1304) below AT7456E.
  • STM32 (C111182) left, near UART (C2986198).
  • Video Input (C168977) top, Video Output (C168977) bottom.
  • AMS1117 (C84899) + caps right.
• Traces:
  • UART: <10 mm, isolated from video.
  • SPI: <5 mm, grouped, direct.
  • Video: Wide (0.5 mm), >2 mm from digital signals.
• Ground Plane: Bottom layer, stitched with vias.

• AT7456E: $2.66
• STM32: $0.60
• Crystal: $0.10
• Load Capacitors: 2 × $0.01 = $0.02
• AMS1117-3.3: $0.08
• 100 nF Capacitors: 3 × $0.01 = $0.03
• 10 µF Capacitor: $0.03
• 75-ohm Resistors: 2 × $0.01 = $0.02
• 22 µF Capacitor: $0.06
• 10 kΩ Resistor: $0.01
• UART Connector: $0.30
• Video Input Connector: $0.15
• Video Output Connector: $0.15
• Total: $4.21 (excluding shipping/taxes)

• AT7456E Compatibility: Identical to MAX7456 in function and pinout, fully supported by ArduPilot OSD (set OSD_TYPE=1).
• Firmware: STM32 needs MAVLink parsing and SPI control for AT7456E (same as MAX7456).
• Verification: Check LCSC.com for current pricing/stock as of April 3, 2025.