CANBUS

flux

Work done
  • Rechecked production blockers and confirmed the board is still blocked by routing/copper issues.
  • Cleaned up physical placement for manufacturability: connectors remain edge-accessible and the CAN, RS485, STM32, SWD/reset, and motor sections are separated across the 160 × 150 mm 4-layer board.
  • Confirmed the previous SW_RST1 metadata blocker is resolved with Omron B3F-1000; no queried missing-footprint or missing-MPN blockers remain.
  • Updated the DRC/ERC Remediation Log with the latest status and required cleanup path.
Success criteria review
  • ❌ All DRC/ERC issues resolved: not yet — 59 airwire errors and 141 overlapping-copper errors remain.
  • ❌ PCB routing/copper cleanup complete: not yet — stale copper groups around Trace 3c95 / Trace ad2c still need deletion or rerouting.
  • ✅ Manufacturing metadata/footprints validated for queried blockers: no missing-MPN or missing-footprint errors were reported.
  • ❌ Production exports generated: blocked intentionally because unresolved airwires and copper overlaps would make the files unsafe for fabrication.
Next steps
Use the PCB editor cleanup/routing workflow to remove or regenerate the stale 3c95... and ad2c... copper groups, then rerun checks. Once airwires and copper overlaps are zero, Gerber, BOM, pick-and-place, and optional STEP/netlist exports can be generated.
K

kaanolgun

stm32f446re mikroişlemcisini kullandın mı

flux

Hayır, şu an tasarımda STM32F446RE mikroişlemcisinin kendisi ayrı bir IC olarak kullanılmamış görünüyor.
Mevcut şemada yapılan yapı şu şekilde:
  • STM32F446RE için header/konnektör bağlantıları var (J_STM32A, J_STM32B)
  • CAN, RS485, STEP/DIR/ENABLE, SWD ve reset sinyalleri bu header’lara bağlanmış
  • Yani tasarım, STM32F446RE kartı/modülü dışarıdan takılacakmış gibi hazırlanmış
Ama PCB üzerinde doğrudan:
  • STM32F446RE MCU paketi
  • Kristal/osilatör
  • BOOT pin devresi
  • VCAP kapasitörleri
  • Tüm VDD/VDDA/VSS pin bağlantıları
gibi gerçek STM32F446RE minimum sistem devresi yok.
Eğer hedefin tamamen standalone PCB üzerinde STM32F446RE çipi olsun ise, mevcut header tabanlı tasarımı değiştirmemiz gerekir: STM32F446RE MCU’yu doğrudan ekleyip güç, clock, boot, reset, SWD ve tüm gerekli decoupling devrelerini tamamlamalıyız.
MCU ekle
Header uyumluluğu
Datasheet kontrolü
Standalone kart
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Files

Schematic

Layout

Preview

U_RS485A
U_REG1
U_RS485B
J_STM32B
J_MOTOR
J_STM32A
J_PWR_CAN
J_RS485
C3
Capacitance
100 nF
C9
Capacitance
100 nF
J_SWD1
C_REGOUT1
Capacitance
10 uF
C10
Capacitance
100 nF
C_BULK1
Capacitance
47 uF
C4
Capacitance
100 nF
C6
Capacitance
100 nF
C8
Capacitance
100 nF
C5
Capacitance
100 nF
C7
Capacitance
100 nF
R_TERM1
Resistance
120 ohms
SW_RST1
D_CAN1
R_NRST1
Resistance
10 kOhms
U_LS1
U_CAN1
Project Specification
Purpose
Design a standalone STM32F446RE-header PCB for CAN-bus controlled step motor operation using external 5V input, local 3.3V logic, CAN, RS485 encoder feedback, SWD/debug, reset, and level-shifted STEP/DIR/ENABLE outputs.
Functional Blocks
  • Power: 5V input on J_PWR_CAN, AP2112K-3.3TRG1 local 3.3V regulator, 47uF bulk capacitance, 10uF regulator output capacitance, and 100nF local bypass capacitors.
  • STM32 control core: J_STM32A and J_STM32B provide STM32F446RE header connectivity.
  • CAN interface: U_CAN1 TJA1051T/3 with 5V VCC, 3.3V VIO, CANH/CANL connector, NUP2105LT1G protection, and accessible optional R_TERM1 120 ohm termination.
  • RS485 encoder interfaces: U_RS485A and U_RS485B MAX485 modules with UART TX/RX and shared DE/RE control lines from the STM32 header.
  • Level shifting: U_LS1 SN74AHCT125DR buffers 3.3V STEP/DIR/ENABLE into 5V-compatible outputs.
  • Debug/reset: J_SWD1 SWD header and SW_RST1 reset switch with 10k pull-up.
  • Motor driver connector: J_MOTOR provides STEP, DIR, ENABLE, 3.3V reference, 5V, and GND.
Key Net Map
  • Power: 5V_IN, 5V, 3V3, GND.
  • CAN: CAN_TX_3V3, CAN_RX_3V3, CANH, CANL.
  • RS485 channel A: RS485A_TX, RS485A_RX, RS485A_DE_RE, RS485A_A, RS485A_B.
  • RS485 channel B: RS485B_TX, RS485B_RX, RS485B_DE_RE, RS485B_A, RS485B_B.
  • Motor control: STEP_3V3/STEP_5V, DIR_3V3/DIR_5V, ENABLE_3V3/ENABLE_5V.
  • Debug/reset: SWDIO, SWCLK, NRST.
Layout Intent
Use a 4-layer PCB with a solid shared ground reference for low EMI. Place connectors on edges with labels readable from both board orientations. Group modules by function: power/CAN on one edge, STM32 headers central, RS485 encoder interface near its connector, motor connector on the opposite edge, and SWD/reset accessible near the control core. Route CANH/CANL short, parallel, and length-balanced, with TVS and optional termination near the CAN connector.
Future Split Strategy
Keep a logical separation between the main CAN/STM32 control board area and the motor driver/encoder communication area. Maintain clear connector boundaries so the design can later split into a main CAN/STM32 board and a motor/encoder interface board.

  • Purpose

  • Functional Blocks

  • Key Net Map

  • Layout Intent

  • Future Split Strategy