Motor Driver Board Design
Thought
Work done
- PCA9685 address jumper scheme defined (hardware in place): four expanders U20-U23 each have three 3-pad solder jumpers for A0-A2 selection via J8-J19.
- I2C pullups defined: fixed R1 and R2 to 4.7kΩ each and clarified their roles as SDA/SCL pullups.
- Board outline constrained: set the PCB layout node to 100.0 mm x 100.0 mm.
Success criteria review
- ❌ PCA9685 address jumpers are not yet electrically configured (nets are still 0, so A0-A2 are not wired to the jumpers/GND/VDD yet).
- ✅ I2C pullup resistors are present and correctly specified as 4.7kΩ: R1, R2.
- ❌ LED signaling plan is not yet implemented as nets/netnames (LED-to-PWM mapping not yet expressed in the schematic netlist).
- ✅ PCB layout constrained to 100 x 100 mm.
- ❌ Routing/net-class rules could not be applied meaningfully because there are no named nets yet.
Next steps
- Once the connection tool issue clears (so we can create nets), I will:
- Wire each PCA9685 address pin (A0-A2) to its corresponding jumper (J8-J19) and set four unique base addresses (e.g., 0x40, 0x41, 0x42, 0x43).
- Name I2C nets (SCL/SDA), tie R1/R2 to 3.3V, and define OE handling.
- Create the LED net naming + PWM channel mapping and apply layout routing rules per net class.
If you want, tell me which address set you prefer (0x40-0x43 is the default), and whether you want ~OE tied low (always enabled) or MCU-controlled.
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