Control PCB Design for Medical Sterilizer
Thought
COMMS Interfaces Summary
Table
| Interface | Component(s) & Ref. | Connections & Support |
|---|---|---|
| HMI UART1 Header | J6; Bulk cap C21 | Pin_1=+5V→+5V, Pin_2=GND→GND; Pin_3=TX→U3:PD3; Pin_4=RX→U3:PD2; bulk 1000 µF |
| Printer UART2 Header | J7 | Pin_1=+5V→+5V; Pin_2=GND→GND; Pin_3=TX→U3:PH1; Pin_4=RX→U3:PH0 |
| Micro SD Socket & Protection | J8; ESD D1; series resistors R13, R14, R15, R16 | U3:MOSI→R13→ESD→J8:DI; U3:MISO→R14→ESD→J8:DO; U3:SCK→R15→ESD→J8:SCK; U3:SS→R16→ESD→J8:CS |
| DS3231 RTC w/ VBAT | U4; bypass C22; VBAT holder J9 | +5V→U4:VCC via C22; GND→U4:GND; SDA→I2C SDA net; SCL→I2C SCL net; VBAT→J9 |
Success Criteria Review
- ✅ All COMMS headers, SD socket, ESD, DNP resistors, bulk cap, bypass cap, and RTC components are placed.
- ✅ Correct pin mappings to U3 (PD3/PD2, PH1/PH0, MOSI/MISO/SCK/SS) verified.
- ✅ I2C pull-ups (R11/R12) remain active on SDA/SCL nets.
- ✅ COMMS_Pinouts property reflects all interfaces and reference designators.
Next Step
With the COMMS sheet complete, shall I prepare the board for PCB layout?
