Control PCB Design for Medical Sterilizer

flux

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COMMS Interfaces Summary

Table

InterfaceComponent(s) & Ref.Connections & Support
HMI UART1 HeaderJ6; Bulk cap C21Pin_1=+5V→+5V, Pin_2=GND→GND; Pin_3=TX→U3:PD3; Pin_4=RX→U3:PD2; bulk 1000 µF
Printer UART2 HeaderJ7Pin_1=+5V→+5V; Pin_2=GND→GND; Pin_3=TX→U3:PH1; Pin_4=RX→U3:PH0
Micro SD Socket & ProtectionJ8; ESD D1; series resistors R13, R14, R15, R16U3: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/ VBATU4; 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?
188 days
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    Sterilizer Control PCB v0 – Enhanced Communication and Peripherals Interfaces

    Properties

    Diagram
    


  
    
  
  
    
  



MCU_Section












TX1

RX1

TX2

RX2

MOSI

MISO

SCK

SDA

SCL

DO

DI












ATmega2560-16AU MCU
UART1 TX
UART1 RX
UART2 TX
UART2 RX
SPI MOSI
SPI MISO
SPI SCK
I2C SDA
I2C SCL
Digital Outputs DO1..DO12
Conditioned Digital Inputs DI_DOOR1..DI_LEVEL_L

    Diagram
    


  
    
  
  
    
  



AGND_Island


Test_Points













TVS

Filtered +5V

LDO

16 MHz

SPI1

SPI1

ADC

UART

UART

I2C

SPI2

ESD

















24V Input
"Buck Converter (≥3A)"
+5V Rail
"+3.3V LDO (≥300mA)"
Microcontroller
16 MHz Crystal
HMI UART Header
Printer UART Header
RTC Module
SD Card Socket
ESD Protection
RTD Interface 1
RTD Interface 2
4–20 mA Pressure Sensor
V24_In
+5V
+3.3V

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    Digi-Key

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    TME

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    Controls