# Brainstorm a new project with AI [Example] ## Description MCU Footprint Update – Verified with No New DRC Violations ## Project Details - **Owner:** loreslady - **Created:** 12/20/2025 - **Last Updated:** 1/11/2026 - **Visibility:** Public - **Verification Steps:** 1) ERC after schematic updates; 2) DRC after routing; 3) Parts availability check once layout is complete - **Stackup:** Standard 4 Layer - **RF Keepout Notes:** Maintain full-layer copper keepout beneath and around the RF1 net routing from U2 (TMS37157) to L1 and J3 external antenna connector, extending to the board edge. No ground pour, power pour, or signal traces on any layer in this region. - **Controlled Impedance:** 90Ω - **InterfacingAvailabilityReview:** {"pull_up_pull_down":[],"parts_available":[{"designator":"U1","available":true},{"designator":"J2","available":true},{"designator":"C4","available":true},{"designator":"C6","available":true},{"designator":"C7","available":true},{"designator":"C8","available":true},{"designator":"C9","available":true},{"designator":"C10","available":true},{"designator":"C11","available":true},{"designator":"C12","available":true},{"designator":"C13","available":true},{"designator":"C14","available":true},{"designator":"C15","available":true},{"designator":"C16","available":true},{"designator":"J2","available":true},{"designator":"L1","available":true},{"designator":"C5","available":true}]} - **Part Type:** System / Device - **3.3VCurrent:** 0.5A - **VBUSCurrent:** 0.5A - **PowerPlanes:** {"L2":"3.3V","L3":"GND"} - **Connectivity:** USB - **Manufacturing Quantity Target:** 100 - **Bus Type:** USB 2.0 - **RFID Subsystem Description:** LF 134.2 kHz FDX-B compliant front-end driving a resonant antenna network, optimized for animal microchip reading with sufficient read range for companion animals. - **Human Interface:** Display - **Zero-Stock Parts:** U1, J1, D1 - **BoardDimension:** 147.6mm - **System Architecture:** ```mermaid flowchart TD MCU["STM32G431CBU6 MCU"] RFID["TMS37157 RFID Front-End"] PWR["MCP1825 3.3V Regulator"] USB["USB-C Interface"] ANT["External Antenna\nConnector (ANT+/ANT-)"] ESD["TPD4E02 ESD Protection"] DEC["NP0/C0G Tuning Kit\n470pF + Trim Caps (100pF,47pF,22pF) and Optionals (390pF,510pF)"] PWR --> MCU PWR --> RFID USB --> ESD ESD --> MCU MCU --> RFID RFID --> ANT DEC --> MCU DEC --> RFID DEC --> PWR ``` - **Power Subsystem Description:** Uses 5 V from USB-C VBUS, regulated down to 3.3 V for MCU and RFID front-end via low-noise LDO or buck, with appropriate decoupling and EMI filtering. - **Operating Voltage:** 5V - **License:** https://www.gnu.org/licenses/gpl-3.0.html - **Domain:** Consumer Electronics - **GroundFill:** Enabled - **BoardExtentY:** 127.35mm - **Trace Classes:** {"USB Data Lines":["D+","D-","CC1","CC2"],"RF Feed":["RF1"],"Power Nets":["VBUS","3.3V"]} - **Net Type:** High Speed - **AirwireReview:** {"design_rule_check_airwires":[]} - **Target Standard:** ISO 11784/11785 FDX-B animal identification - **TraceClasses:** {"USB":{"Nets":["D+","D-","CC1","CC2"],"Impedance":"90Ω differential","Spacing":"0.15 mm pair gap, 0.25 mm to other nets"},"RF":{"Nets":["RF1"],"Impedance":"50Ω single-ended","Spacing":"0.50 mm to any other net, 0.75 mm to GND copper"},"Power":{"Nets":["VBUS","3V3"],"Impedance":"n/a","Spacing":"0.20 mm to signals, 0.25 mm to other power nets"}} - **RF Section Constraints:** J3 at the board edge for external antenna; RF1 routed short to C4 and trim capacitors; RF antenna keepout region on all layers; Guard-ground ring around the RF feed, connected to GND and not under RF1 - **Guard Ground Zone:** Guard-ground ring around RF1 feed from U2 to L1 and J3, tied to GND, maintaining ≥0.5 mm clearance from RF trace and with no ground directly beneath the RF1 segment. - **BoardExtentX:** 147.6mm - **Role:** Sensing (Shunt) - **Antenna Keepout Region:** RF antenna keepout region on all copper layers around J3 external antenna connector and RF1 feed routing; no planes, pours, or signal traces allowed in this reserved area. - **Power Requirements:** USB - **Role Details:** Phone-powered handheld reader for 134.2 kHz FDX-B animal ID microchips with USB-C UFP interface and RGB status indication. - **Mechanical Concept:** Phone-dongle style PCB with top-center USB-C plug, antenna area kept clear, RGB LED at bottom-right visible through enclosure window. - **Reference Design URL:** https://www.iso.org/standard/78813.html - **Software:** Bare metal - **Decoupling Cluster:** Place 100 nF ceramic decoupling capacitors tightly clustered at each VDD pin of U1 (STM32G431) and U2 (TMS37157), with shortest-possible loops to the nearest ground via. Verify that U3 (MCP1825) has appropriately valued VIN and VOUT capacitors routed with minimal trace length directly at the regulator pins, and that the USB VBUS bulk capacitor is placed adjacent to J1 (USB-C connector) on the VBUS net. - **ManufacturabilityReview:** {"parts_available":[{"designator":"J2","available":true},{"designator":"L1","available":true},{"designator":"C5","available":true}],"design_rule_check_missing_footprints":[],"design_rule_check_manufacture_part_number":[]} - **Review Status:** Pending ERC/DRC - **Stars:** 1 ## Key Components ### D1 — [TPD4E02B04DQA](https://www.flux.ai/kicad-part-library/tpd4e02b04dqa~id.md) - Package or Case Code: USON-10_2.5x1.0mm_P0.5mm - Manufacturer Part Number: TPD4E02B04DQA - Manufacturer Name: Texas Instruments Inc. - Datasheet URL: http://www.ti.com/lit/ds/symlink/tpd4e02b04.pdf **Pins:** - G [pin 3] - G [pin 8] - IO1 [pin 1] - IO2 [pin 2] - IO3 [pin 4] - IO4 [pin 5] - NC [pin 7] - NC [pin 6] - NC [pin 9] - NC [pin 10] ### J1 — [CSP-USC16-TR](https://www.flux.ai/jecstronic/csp-usc16-tr~7h4.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: VALCON - Datasheet URL: https://www.snapeda.com/parts/CSP-USC16-TR/Valcon/datasheet/ - Part Type: USB C - Manufacturer Part Number: CSP-USC16-TR **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND_A [pin A12] - GND_A [pin A1] - GND_B [pin B12] - GND_B [pin B1] - SBU1 [pin A8] - SBU2 [pin B8] - SHELL_GND [pin S2] - SHELL_GND [pin S3] - SHELL_GND [pin S4] - SHELL_GND [pin S1] - VBUS_A [pin A4] - VBUS_A [pin A9] - VBUS_B [pin B4] - VBUS_B [pin B9] ### J2 — [AVR-ISP-10](https://www.flux.ai/vasy_skral/avr-isp-10~y9c.md) - Connector Rows: 2 - Mount: Through Hole - Connector Pitch: 2.54mm - Part Type: Connector - Allow Substitutes: Yes - Manufacturer Part Number: 61201021621 - Connector Type: Headers and Wire Housings - Connector Positions: 10 - Manufacturer: Würth - Datasheet URL: https://katalog.we-online.de/em/datasheet/61201021621.pdf - Manufacturer Name: Würth **Pins:** - ~RST [pin 5] - GND [pin 10] - GND [pin 8] - GND [pin 6] - GND [pin 4] - MISO [pin 9] - MOSI [pin 1] - NC [pin 3] - SCK [pin 7] - VCC [pin 2] ### LED1 — [MSL0402RGBU1](https://www.flux.ai/adrian95/msl0402rgbu1~1uk.md) - Part Type: LED - Package or Case Code: LED-SMD - Package: MSL0402RGBU1 - Manufacturer Part Number: MSL0402RGBU1 - Manufacturer Name: Rohm Semiconductor - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: RGB status indicator at bottom-right - Mount: Surface Mount - Role: LED - Datasheet URL: https://fscdn.rohm.com/en/products/databook/datasheet/opto/led/chip_multi/msl0402rgbu1-e.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] ### TP_ANT_P1 — [5015](https://www.flux.ai/adietz12/5015~jd.md) - Manufacturer Name: Keystone Electronics - Datasheet URL: https://www.keyelco.com/userAssets/file/M65p55.pdf - Manufacturer Part Number: 5015 **Pins:** - TP [pin TP] ### TP_ANT_P2 — [5015](https://www.flux.ai/adietz12/5015~jd.md) - Manufacturer Part Number: 5015 - Manufacturer Name: Keystone Electronics - Datasheet URL: https://www.keyelco.com/userAssets/file/M65p55.pdf **Pins:** - TP [pin TP] ### TP_C4_P1 — [5015](https://www.flux.ai/adietz12/5015~jd.md) - Manufacturer Name: Keystone Electronics - Manufacturer Part Number: 5015 - Datasheet URL: https://www.keyelco.com/userAssets/file/M65p55.pdf **Pins:** - TP [pin TP] ### TP_C4_P2 — [5015](https://www.flux.ai/adietz12/5015~jd.md) - Manufacturer Name: Keystone Electronics - Manufacturer Part Number: 5015 - Datasheet URL: https://www.keyelco.com/userAssets/file/M65p55.pdf **Pins:** - TP [pin TP] ### TP_L1_P1 — [5015](https://www.flux.ai/adietz12/5015~jd.md) - Manufacturer Part Number: 5015 - Manufacturer Name: Keystone Electronics - Datasheet URL: https://www.keyelco.com/userAssets/file/M65p55.pdf **Pins:** - TP [pin TP] ### TP_L1_P2 — [5015](https://www.flux.ai/adietz12/5015~jd.md) - Manufacturer Part Number: 5015 - Datasheet URL: https://www.keyelco.com/userAssets/file/M65p55.pdf - Manufacturer Name: Keystone Electronics **Pins:** - TP [pin TP] ### U1 — [STM32G431CBU6](https://www.flux.ai/jecstronic/stm32g431cbu6~ovk.md) - Datasheet URL: https://www.st.com/resource/en/datasheet/stm32g431cb.pdf - Manufacturer Part Number: STM32G431CBU6 - Part Type: Microcontroller - Manufacturer Name: STMicroelectronics NV - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - EP [pin 49] - PA0 [pin 8] - PA1 [pin 9] - PA10 [pin 32] - PA11 [pin 33] - PA12 [pin 34] - PA13 [pin 36] - PA14 [pin 37] - PA15 [pin 38] - PA2 [pin 10] - PA3 [pin 11] - PA4 [pin 12] - PA5 [pin 13] - PA6 [pin 14] - PA7 [pin 15] - PA8 [pin 30] - PA9 [pin 31] - PB0 [pin 17] - PB1 [pin 18] - PB10 [pin 22] - PB11 [pin 24] - PB12 [pin 25] - PB13 [pin 26] - PB14 [pin 27] - PB15 [pin 28] - PB2 [pin 19] - PB3 [pin 41] - PB4 [pin 42] - PB5 [pin 43] - PB6 [pin 44] - PB7 [pin 45] - PB8-BOOT0 [pin 46] - PB9 [pin 47] - PC10 [pin 39] - PC11 [pin 40] - PC13 [pin 2] - PC14-OSC32_IN [pin 3] - PC15-OSC32_OUT [pin 4] - PC4 [pin 16] - PC6 [pin 29] - PF0-OSC_IN [pin 5] - PF1-OSC_OUT [pin 6] - PG10-NRST [pin 7] - VBAT [pin 1] - VDD_1 [pin 23] - VDD_2 [pin 35] - VDD_3 [pin 48] - VDDA [pin 21] - VREF+ [pin 20] ### U2 — [TMS37157IRSARG4](https://www.flux.ai/adrian95/tms37157irsarg4~y8f.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: TMS37157IRSARG4 - Role: RFID Front-End - Role Details: 134.2 kHz FDX-B analog front end - Part Type: Integrated Circuit - Manufacturer Name: Texas Instruments - Package: 16-VQFN - Datasheet URL: https://www.ti.com/lit/ds/symlink/tms37157.pdf **Pins:** - BUSY [pin 8] - CLK_AM [pin 9] - EOB [pin 5] - EP [pin 17] - GND [pin 15] - NPOR [pin 6] - PUSH [pin 7] - RF1 [pin 1] - SPI_CLK [pin 10] - SPI_SIMO [pin 12] - SPI_SOMI [pin 11] - TCLK [pin 2] - TDAT [pin 3] - TEN [pin 4] - VBAT [pin 14] - VBATI [pin 13] - VCL [pin 16] ### U3 — [MCP1825S-3302E/DB](https://www.flux.ai/adrian95/mcp1825s-3302edb~3re.md) - Datasheet URL: https://datasheet.datasheetarchive.com/originals/distributors/SFDatasheet-4/sf-00090042.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip - Manufacturer Part Number: MCP1825S-3302E/DB - Package or Case Code: SOT230P700X180-4N - Role: Power Conversion - Package: SOT-223-3 - Part Type: Power Management - Role Details: Regulate 5V USB VBUS to 3.3V for MCU and RFID **Pins:** - GND_(TAB)_1 [pin 2] - GND_(TAB)_2 [pin 4] - VIN [pin 1] - VOUT [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/loreslady/brainstorm-a-new-project-with-ai-example~ss](https://www.flux.ai/loreslady/brainstorm-a-new-project-with-ai-example~ss).* --- *Generated from [https://www.flux.ai/loreslady/brainstorm-a-new-project-with-ai-example~ss](https://www.flux.ai/loreslady/brainstorm-a-new-project-with-ai-example~ss)*