# Disciplinary White Matter Compiler ## Description Sterilizer Control PCB v0 – Enhanced Communication and Peripherals Interfaces ## Project Details - **Owner:** koertsunay - **Created:** 10/28/2025 - **Last Updated:** 10/28/2025 - **Visibility:** Public - **Load Capacitor 2 Designator:** C8 - **I2C SDA Connections:** U3:SDA, R11:P1, I2C_Device:SDA with R11 as 4.7kΩ pull-up to +5V - **I2C SCL Connections:** U3:SCL, R12:P1, I2C_Device:SCL with R12 as 4.7kΩ pull-up to +5V - **Load Capacitor 1 Nets:** XTAL1, GND - **Digital Outputs:** DO1:U3:PD0, DO2:U3:PD1, DO3:U3:PD2, DO4:U3:PD3, DO5:U3:PD4, DO6:U3:PD5, DO7:U3:PD6, DO8:U3:PD7, DO9:U3:PB0, DO10:U3:PB1, DO11:U3:PB2, DO12:U3:PB3 - **MCU_IO_Report (Step 2.3):** {"reset_circuit":{"pullup_resistor":{"designator":"R2","value":"10kΩ","connections":"U3:~RESET to +5V"},"pushbutton":{"designator":"SW1","connections":"U3:~RESET to GND"},"routing_guidance":"RESET track routed short and clear of high-speed signals"},"icsp_header":{"header_designator":"J1","type":"Pin Header 2x3 2.54mm","pin_mapping":{"Pin_1":"U3:MISO","Pin_2":"+5V","Pin_3":"U3:SCK","Pin_4":"U3:MOSI","Pin_5":"U3:~RESET","Pin_6":"GND"},"placement_notes":"Pin-1 silkscreen marker placed; header positioned close to U3 to minimize RESET trace length"},"esd_note":"ESD protection (e.g., TVS diodes) suggested for all ICSP header lines","erc_drc_status":{"erc":"All RESET/ICSP related connections pass ERC","drc":"No DRC issues on RESET/ICSP traces, placement, or clearance"}} - **MCU_IO_Report (Step 2.2):** {"mcu_designator":"U3","crystal":{"designator":"Y1","nets":{"XTAL1":"U3:XTAL1,R1:P1,R1:P2,Y1:P1,C7:P1","XTAL2":"U3:XTAL2,Y1:P2,C8:P1"}},"load_capacitors":[{"designator":"C7","connections":"XTAL1,GND:GND"},{"designator":"C8","connections":"XTAL2,GND:GND"}],"series_resistor":{"designator":"R1","connections":"XTAL1 (series between U3:XTAL1 and Y1:P1)"},"power_pin_coverage":{"VCC":["U3:VCC","C13:P1","C14:P1","C15:P1"],"GND":["U3:GND","C13:P2","C14:P2","C15:P2","C16:P2"],"AVCC":["U3:AVCC","L2:P2","C16:P1"]},"aref_decoupling":{"AREF":["U3:AREF","C16:P1","C16:P2"]},"nets_connected":["+5V","GND","AVCC","AREF","XTAL1","XTAL2"]} - **System Architecture:** ```mermaid flowchart LR subgraph MCU_Section MCU[ATmega2560-16AU MCU] UART1_TX[UART1 TX] UART1_RX[UART1 RX] UART2_TX[UART2 TX] UART2_RX[UART2 RX] SPI_MOSI[SPI MOSI] SPI_MISO[SPI MISO] SPI_SCK[SPI SCK] I2C_SDA[I2C SDA] I2C_SCL[I2C SCL] DO[Digital Outputs DO1..DO12] DI[Conditioned Digital Inputs DI_DOOR1..DI_LEVEL_L] end MCU -->|TX1| UART1_TX MCU -->|RX1| UART1_RX MCU -->|TX2| UART2_TX MCU -->|RX2| UART2_RX MCU -->|MOSI| SPI_MOSI MCU -->|MISO| SPI_MISO MCU -->|SCK| SPI_SCK MCU -->|SDA| I2C_SDA MCU -->|SCL| I2C_SCL MCU -->|DO| DO MCU -->|DI| DI ``` - **UART2 Header:** J4: Pin Header 01x04 2.54mm Vertical, Pin_1 = U3:PH1 (UART2_TX), Pin_2 = U3:PH0 (UART2_RX), Pin_3 = +5V, Pin_4 = GND - **Load Capacitor 2 Nets:** XTAL2, GND - **Load Capacitor 1 Designator:** C7 - **Series Resistor Nets:** XTAL1 - **Crystal Nets:** XTAL1, XTAL2 - **PWR_24V_5V_ERC_Critical_Issues:** None - **PWR_24V_5V_DRC_Reviews:** {"design_rule_check_airwires":[],"design_rule_check_floating_copper":[],"design_rule_check_overlapping_fills":[],"design_rule_check_invalid_layer":[],"design_rule_check_missing_footprints":[],"design_rule_check_overlapping_copper":[],"design_rule_check_deprecated_rules":[],"design_rule_check_trace_corner_radius":[],"design_rule_check_protected_intrusions":[]} - **Crystal Designator:** Y1 - **System Architecture:** ```mermaid graph LR V24[24V Input] -->|TVS| Buck[Buck Converter (≥3A)] Buck -->|Filtered +5V| V5[+5V Rail] V5 -->|LDO| V33[+3.3V LDO (≥300mA)] MCU[Microcontroller] -->|16 MHz| XTAL[16 MHz Crystal] MCU -->|SPI1| RTD1[RTD Interface 1] MCU -->|SPI1| RTD2[RTD Interface 2] MCU -->|ADC| PS[4–20 mA Pressure Sensor] MCU -->|UART| HMI[HMI UART Header] MCU -->|UART| PRN[Printer UART Header] MCU -->|I2C| RTC[RTC Module] MCU -->|SPI2| SD[SD Card Socket] SD -->|ESD| ESD_SD[ESD Protection] subgraph AGND_Island RTD1 RTD2 PS end subgraph Test_Points TP1[V24_In] TP2[+5V] TP3[+3.3V] end ``` - **UART1 Header:** J3: Pin Header 01x04 2.54mm Vertical, Pin_1 = U3:PD3 (UART1_TX), Pin_2 = U3:PD2 (UART1_RX), Pin_3 = +5V, Pin_4 = GND - **Conditioned Digital Inputs:** DI_DOOR1(U3:PL0): R3(100Ω) series, R7(10kΩ to +5V) pull-up, C9(10nF to GND) filter; DI_DOOR2(U3:PL1): R4(100Ω), R8(10kΩ), C10(10nF); DI_LEVEL_H(U3:PL2): R5(100Ω), R9(10kΩ), C18(10nF); DI_LEVEL_L(U3:PL3): R6(100Ω), R10(10kΩ), C19(10nF) - **PWR_24V_5V_ERC_Reviews:** {"decoupling_caps":[],"resistor_power_rating":[],"pull_up_pull_down":[],"capacitor_voltage_rating":[],"parts_available":[]} - **ESD_Protection_Note:** Consider dedicated ESD protection diodes (e.g., TVS) on all ICSP header lines to enhance robustness against electrostatic discharge during in-circuit programming and handling. - **Series Resistor Designator:** R1 - **PWR_24V_5V_Review_Summary:** No critical ERC or DRC issues identified for the PWR_24V_5V sheet as currently populated. All mandatory power, filtering, and test point features are in place, with component ratings and nets properly defined. - **SPI Interface Mapping:** MOSI=U3:MOSI→J5:DI, MISO=U3:MISO→J5:DO, SCK=U3:SCK→J5:SCK, SD_CS=U3:SS→J5:CS - **MCU Designator:** U3 - **PWR_24V_5V_DRC_Critical_Issues:** None - **MCU_IO_Report (Step 2.4):** {"uart_headers":{"UART1":{"header_designator":"J3","type":"Pin Header 01x04 2.54mm Vertical","pin_mapping":{"Pin_1":"U3:PD3 (UART1_TX)","Pin_2":"U3:PD2 (UART1_RX)","Pin_3":"+5V","Pin_4":"GND"}},"UART2":{"header_designator":"J4","type":"Pin Header 01x04 2.54mm Vertical","pin_mapping":{"Pin_1":"U3:PH1 (UART2_TX)","Pin_2":"U3:PH0 (UART2_RX)","Pin_3":"+5V","Pin_4":"GND"}}},"spi_interface":{"MOSI":"U3:MOSI","MISO":"U3:MISO","SCK":"U3:SCK","SD_CS":"U3:SS"},"i2c_interface":{"SDA":{"connections":["U3:SDA","R11:P1","I2C_Device:SDA"]},"SCL":{"connections":["U3:SCL","R12:P1","I2C_Device:SCL"]}},"digital_outputs":["DO1","DO2","DO3","DO4","DO5","DO6","DO7","DO8","DO9","DO10","DO11","DO12"],"conditioned_inputs":{"DI_DOOR1":{"series_resistor":"R3","pull_up":"R7","filter_capacitor":"C9","connections":["U3:PL0","R3:P1","R7:P2","C9:P2"]},"DI_DOOR2":{"series_resistor":"R4","pull_up":"R8","filter_capacitor":"C10","connections":["U3:PL1","R4:P1","R8:P2","C10:P2"]},"DI_LEVEL_H":{"series_resistor":"R5","pull_up":"R9","filter_capacitor":"C18","connections":["U3:PL2","R5:P1","R9:P2","C18:P2"]},"DI_LEVEL_L":{"series_resistor":"R6","pull_up":"R10","filter_capacitor":"C19","connections":["U3:PL3","R6:P1","R10:P2","C19:P2"]}},"todo":"Implement Schmitt buffer stage for all conditioned digital inputs"} - **Conditioned Input ToDo:** Implement Schmitt buffer stage for all conditioned digital inputs - **COMMS_Pinouts:** HMI UART1 Header J6: Pin_1=+5V, Pin_2=GND, Pin_3=TX→U3:PD3, Pin_4=RX→U3:PD2; Bulk Cap: C21 (1000µF) Printer UART2 Header J7: Pin_1=+5V, Pin_2=GND, Pin_3=TX→U3:PH1, Pin_4=RX→U3:PH0 Micro SD Socket J8: Pin_3=MOSI via R13, Pin_7=MISO via R14, Pin_5=SCK via R15, Pin_2=CS via R16; ESD Array: D1; Series Resistors (DNP 22–47Ω): R13 (MOSI), R14 (MISO), R15 (SCK), R16 (CS) DS3231 RTC U4: VCC→+5V (C22 bypass cap, 0.1µF), GND→GND, SDA→I2C SDA net, SCL→I2C SCL net; VBAT→J9; Coin Cell Holder: J9 ## Key Components ### D1 — [SMCJ33A](https://www.flux.ai/lcsc/smcj33a.md) - Role Details: Transient voltage suppression between V24 and GND - LCSC Part Number: C2904855 - JLCPCB Part Class: Extended Part - Manufacturer Part Number: SMCJ33A - Manufacturer Name: SHIKUES(时科) - Part Type: TVS - Role: Protection - Package or Case Code: SMC_L6.9-W5.9-LS7.9-RD **Pins:** - 1 [pin 1] - 2 [pin 2] ### D1 — [SP3031-01ETG](https://www.flux.ai/adrian95/sp3031-01etg.md) - Part Type: Diode - Role Details: ESD/TVS array for SD socket SPI signals - Manufacturer Part Number: SP3031-01ETG - Manufacturer Name: Littelfuse Inc. - Role: Protection - Datasheet URL: https://www.littelfuse.com/~/media/electronics/datasheets/tvs_diode_arrays/littelfuse_tvs_diode_array_sp3031_datasheet.pdf.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - C [pin 1] ### J1 — [Pin Header 02x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-02x03-254mm-vertical.md) - Role: Connector - Role Details: ICSP programming header, 2×3, 2.54 mm pitch, through-hole - License: https://creativecommons.org/licenses/by/4.0/ - Silkscreen Pin-1: true - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] ### J2 — [Pin Header 01x04 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x04-254mm-vertical.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role Details: UART1 and UART2 header, 1×4 2.54 mm, vertical - Role: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] ### J24V_IN — [31330102](https://www.flux.ai/lcsc/31330102.md) - Datasheet URL: https://assets.lcsc.com/datasheet/szlcsc/Download-ISO9001-Certification.pdf - Manufacturer Part Number: 31330102 - Role Details: 24 V input pluggable terminal block, 2-pin 5.08 mm - Product Info Url: https://lcsc.com/product-detail/Terminal-Blocks_1x2P-pitch5-0mm-900_C123230.html - Role: Connector - Manufacturer Name: METZ CONNECT - Package or Case Code: CONN-TH_2P-P5.08_31330102 - Part Type: Pluggable System Terminal Block - JLCPCB Part Class: Extended Part - LCSC Part Number: C123230 **Pins:** - 1 [pin 1] - 2 [pin 2] ### J3 — [Pin Header 01x04 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x04-254mm-vertical.md) - Silkscreen Pin-1: true - Role Details: UART1 header (Nextion) - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] ### J4 — [Pin Header 01x04 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x04-254mm-vertical.md) - Silkscreen Pin-1: true - Role: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: UART2 header (Printer) - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] ### J5 — [ST-TF-003A](https://www.flux.ai/adrian95/st-tf-003a.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: ST-TF-003A - Datasheet URL: https://www.snapeda.com/parts/ST-TF-003A/Suntech/view-part/?ref=search&t=micro%20sd%20socket - Part Type: Connector - Role Details: SD Card Socket for SPI interface - Role: Connector - Manufacturer Name: Suntech **Pins:** - CD [pin G2] - CD2 [pin G3] - CS [pin 2] - DI [pin 3] - DO [pin 7] - GND [pin G4] - GND [pin G1] - GND [pin 6] - NC [pin 1] - RSV [pin 8] - SCK [pin 5] - SHIELD [pin 9] - VCC [pin 4] ### J6 — [Pin Header 01x04 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x04-254mm-vertical.md) - Role: Connector - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: HMI UART1 header (Pin-1=5V, Pin-2=GND, Pin-3=TX → U3:PD3, Pin-4=RX → U3:PD2) **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] ### J7 — [Pin Header 01x04 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x04-254mm-vertical.md) - Role Details: Printer UART2 header - Part Type: Connector - Role: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] ### J8 — [ST-TF-003A](https://www.flux.ai/adrian95/st-tf-003a.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: ST-TF-003A - Datasheet URL: https://www.snapeda.com/parts/ST-TF-003A/Suntech/view-part/?ref=search&t=micro%20sd%20socket - Part Type: Connector - Role: Connector - Role Details: Micro SD Card Socket on COMMS sheet - Manufacturer Name: Suntech **Pins:** - CD [pin G2] - CD2 [pin G3] - CS [pin 2] - DI [pin 3] - DO [pin 7] - GND [pin G4] - GND [pin G1] - GND [pin 6] - NC [pin 1] - RSV [pin 8] - SCK [pin 5] - SHIELD [pin 9] - VCC [pin 4] ### J9 — [Generic Coin Cell Holder](https://www.flux.ai/jharwinbarrozo/generic-coin-cell-holder.md) - Package: 10mm_fp - Voltage: 3V - Role: Connector - Role Details: Coin-cell holder for DS3231 VBAT - Part Type: Connector **Pins:** - NEG [pin N1] - POS [pin P2] - POS [pin P1] ### SW1 — [B3FS-1050P](https://www.flux.ai/jharwinbarrozo/b3fs-1050p.md) - Part Type: Switch - Manufacturer Name: OMRON - Datasheet URL: https://datasheet.lcsc.com/lcsc/1809271215_Omron-Electronics-B3FS-1050P_C231326.pdf - Manufacturer Part Number: B3FS-1050P - Role Details: Momentary pushbutton for RESET - Role: Switch **Pins:** - P1 - P2 ### U1 — [TPS56339DDC](https://www.flux.ai/kicad-part-library/tps56339ddc.md) - Manufacturer Part Number: TPS56339DDC - Manufacturer Name: Texas Instruments Inc. - Role Details: Buck converter 24 V → 5 V ≥ 3 A - Role: Power Conversion - Package or Case Code: SOT-23-6 - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps56339.pdf **Pins:** - BOOT [pin 6] - EN [pin 5] - FB [pin 4] - GND [pin 1] - SW [pin 2] - VIN [pin 3] ### U2 — [LT1763](https://www.flux.ai/mr-bammby/lt1763.md) - Manufacturer Name: Analog Devices - Datasheet URL: https://eu.mouser.com/datasheet/2/609/1763fh-3123364.pdf - Role: Linear Regulator - Part Type: Power Management - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: LT1763CS8-3.3#PBF - Role Details: Low-noise LDO 5 V→3.3 V ≥300 mA **Pins:** - BYP [pin 4] - GND [pin 7] - GND [pin 6] - GND [pin 3] - IN [pin 8] - nSHDN [pin 5] - OUT [pin 1] - SENSE/ADJ [pin 2] ### U3 — [ATMEGA2560-16AU](https://www.flux.ai/vasy_skral/atmega2560-16au.md) - Manufacturer Name: Microchip - Part Type: Microcontroller - Manufacturer Part Number: ATMEGA2560-16AU - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/ATmega640-1280-1281-2560-2561-Datasheet-DS40002211A.pdf - Role Details: Main MCU for sterilizer control - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~RESET [pin 30] - AREF [pin 98] - AVCC [pin 100] - GND [pin 99] - GND [pin 32] - GND [pin 62] - GND [pin 81] - GND [pin 11] - PA0 [pin 78] - PA1 [pin 77] - PA2 [pin 76] - PA3 [pin 75] - PA4 [pin 74] - PA5 [pin 73] - PA6 [pin 72] - PA7 [pin 71] - PB0 [pin 19] - PB1 [pin 20] - PB2 [pin 21] - PB3 [pin 22] - PB4 [pin 23] - PB5 [pin 24] - PB6 [pin 25] - PB7 [pin 26] - PC0 [pin 53] - PC1 [pin 54] - PC2 [pin 55] - PC3 [pin 56] - PC4 [pin 57] - PC5 [pin 58] - PC6 [pin 59] - PC7 [pin 60] - PD0 [pin 43] - PD1 [pin 44] - PD2 [pin 45] - PD3 [pin 46] - PD4 [pin 47] - PD5 [pin 48] - PD6 [pin 49] - PD7 [pin 50] - PE0 [pin 2] - PE1 [pin 3] - PE2 [pin 4] - PE3 [pin 5] - PE4 [pin 6] - PE5 [pin 7] - PE6 [pin 8] - PE7 [pin 9] - PF0 [pin 97] - PF1 [pin 96] - PF2 [pin 95] - PF3 [pin 94] - PF4 [pin 93] - PF5 [pin 92] - PF6 [pin 91] - PF7 [pin 90] - PG0 [pin 51] - PG1 [pin 52] - PG2 [pin 70] - PG3 [pin 28] - PG4 [pin 29] - PG5 [pin 1] - PH0 [pin 12] - PH1 [pin 13] - PH2 [pin 14] - PH3 [pin 15] - PH4 [pin 16] - PH5 [pin 17] - PH6 [pin 18] - PH7 [pin 27] - PJ0 [pin 63] - PJ1 [pin 64] - PJ2 [pin 65] - PJ3 [pin 66] - PJ4 [pin 67] - PJ5 [pin 68] - PJ6 [pin 69] - PJ7 [pin 79] - PK0 [pin 89] - PK1 [pin 88] - PK2 [pin 87] - PK3 [pin 86] - PK4 [pin 85] - PK5 [pin 84] - PK6 [pin 83] - PK7 [pin 82] - PL0 [pin 35] - PL1 [pin 36] - PL2 [pin 37] - PL3 [pin 38] - PL4 [pin 39] - PL5 [pin 40] - PL6 [pin 41] - PL7 [pin 42] - VCC [pin 10] - VCC [pin 80] - VCC [pin 31] - VCC [pin 61] - XTAL1 [pin 34] - XTAL2 [pin 33] ### U4 — [DS3231SN#](https://www.flux.ai/jecstronic/ds3231sn.md) - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Analog Devices Inc./Maxim Integrated - Role: Timing - Manufacturer Part Number: DS3231SN# - Role Details: Real-time clock with I2C interface and VBAT support - Datasheet URL: https://www.analog.com/media/en/technical-documentation/data-sheets/DS3231.pdf **Pins:** - ~INT~/SQW [pin 3] - ~RST [pin 4] - 32KHZ [pin 1] - GND [pin 13] - N.C._1 [pin 5] - N.C._2 [pin 6] - N.C._3 [pin 7] - N.C._4 [pin 8] - N.C._5 [pin 9] - N.C._6 [pin 10] - N.C._7 [pin 11] - N.C._8 [pin 12] - SCL [pin 16] - SDA [pin 15] - VBAT [pin 14] - VCC [pin 2] ### Y1 — [ABM7-16.000MHZ-D2Y-T](https://www.flux.ai/adrian95/abm7-16000mhz-d2y-t.md) - Role: Timing},{ - Manufacturer Part Number: ABM7-16.000MHZ-D2Y-T - Datasheet URL: https://abracon.com/Resonators/abm7.pdf - Manufacturer Name: Abracon LLC - Part Type: Oscillator - Role Details: Crystal oscillator for part U3 between XTAL1 and XTAL2 - Frequency: 16MHz **Pins:** - P1 - P2 ### Y1 — [ABM7-16.000MHZ-D2Y-T](https://www.flux.ai/adrian95/abm7-16000mhz-d2y-t.md) - Manufacturer Name: Abracon LLC - Part Type: Oscillator - Frequency: 16MHz - Role Details: Crystal oscillator for part U3, 16 MHz - Manufacturer Part Number: ABM7-16.000MHZ-D2Y-T - Datasheet URL: https://abracon.com/Resonators/abm7.pdf - Role: Timing **Pins:** - P1 - P2 *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/koertsunay/disciplinary-white-matter-compiler](https://www.flux.ai/koertsunay/disciplinary-white-matter-compiler).* --- *Generated from [https://www.flux.ai/koertsunay/disciplinary-white-matter-compiler](https://www.flux.ai/koertsunay/disciplinary-white-matter-compiler)*