# Fluttering Coral Mr. Fusion ## Description Raspberry Pi 5 HAT+ PCIe LLM Accelerator Board ## Project Details - **Owner:** 7flash - **Created:** 12/1/2025 - **Last Updated:** 12/1/2025 - **Visibility:** Public - **Project Type:** Raspberry Pi 5 HAT+ PCIe LLM Accelerator Board - **Bus Type:** PCIe 2.0 - **Software:** Linux - **Stackup:** Standard 4 Layer - **Domain:** Consumer Electronics - **Controlled Impedance:** 85Ω - **Connectivity:** USB - **Net Type:** High Speed - **License:** http://solderpad.org/licenses/SHL-2.1/ - **System Architecture:** ```mermaid flowchart LR Pi5["Raspberry Pi 5 40-pin HAT Header"] EEPROM["HAT ID EEPROM (I²C)"] FFC["PCIe FFC Connector (Gen2 x1)"] AC["AC-Coupling Capacitors"] M2["M.2 Key B/M Slot (Accelerator)"] Buck["5 V→3.3 V Buck Converter (5–8 A)"] FuseSense["Fuse & Current Sense"] ESD["ESD/TVS Protection"] Fan["Fan Header"] Thermal["Thermal Keepout Zones"] Pi5 -->|I²C SDA/SCL| EEPROM Pi5 -->|PCIe Signals| FFC FFC --> AC AC --> M2 FuseSense --> Buck Buck -->|3.3 V| Pi5 Buck --> EEPROM Buck --> M2 Fan --> Buck ESD -.->|Protect| Pi5 ESD -.-> FFC ESD -.-> M2 Thermal -.-> M2 Thermal -.-> Buck ``` - **Power Requirements:** USB - **Manufacturing Quantity Target:** 10 ## Key Components ### F1 — [178.6165.0001](https://www.flux.ai/lcsc/178p6165p0001~a7dh.md) - Manufacturer Part Number: 178.6165.0001 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302135_Littelfuse-178-6165-0001_C207060.pdf - JLCPCB Part Class: Extended Part - Package or Case Code: 178.6165.0001 - Manufacturer Name: Littelfuse(美国力特) - Product Info Url: https://lcsc.com/product-detail/Fuseholders_Littelfuse_178-6165-0001_Littelfuse-178-6165-0001_C207060.html - Role Details: Input fuse for 5V supply - Role: Protection - LCSC Part Number: C207060 - Part Type: Fuse Holders **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] ### J1 — [Pin Socket 02x20 for Rpi 5](https://www.flux.ai/project-x/pin-socket-02x20-for-rpi-5~r6.md) - Part Type: Connector - Role Details: Raspberry Pi 5 40-pin HAT header - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector **Pins:** - 3.3v [pin 1] - 3.3v [pin 17] - 5v [pin 2] - 5v [pin 4] - DNC [pin 27] - DNC [pin 28] - Gnd [pin 20] - Gnd [pin 39] - Gnd [pin 34] - Gnd [pin 30] - Gnd [pin 25] - Gnd [pin 9] - Gnd [pin 6] - Gnd [pin 14] - GPIO_05 [pin 29] - GPIO_06 [pin 31] - GPIO_07 [pin 26] - GPIO_08 [pin 24] - GPIO_09 [pin 21] - GPIO_10 [pin 19] - GPIO_11 [pin 23] - GPIO_12 [pin 32] - GPIO_13 [pin 33] - GPIO_14 [pin 8] - GPIO_15 [pin 10] - GPIO_16 [pin 36] - GPIO_17 [pin 11] - GPIO_18 [pin 12] - GPIO_19 [pin 35] - GPIO_2 [pin 3] - GPIO_20 [pin 38] - GPIO_21 [pin 40] - GPIO_22 [pin 15] - GPIO_23 [pin 16] - GPIO_24 [pin 18] - GPIO_25 [pin 22] - GPIO_26 [pin 37] - GPIO_27 [pin 13] - GPIO_3 [pin 5] - GPIO_4 [pin 7] ### J2 — [3160-10120T](https://www.flux.ai/lcsc/3160-10120t~secf.md) - Package or Case Code: PCIE-SMD_230P-P1.00_3160-10120T - Part Type: FFC/FPC Connectors - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2006121234_UMAX-3160-10120T_C601190.pdf - LCSC Part Number: C601190 - Role: Connector - Manufacturer Part Number: 3160-10120T - Product Info Url: https://lcsc.com/product-detail/FFC-FPC-Connectors_UMAX-3160-10120T_C601190.html - Manufacturer Name: UMaxconn(友贸) - JLCPCB Part Class: Extended Part - Role Details: PCIe Gen2 x1 FFC receptacle **Pins:** - A1 [pin A1] - A10 [pin 10] - A100 [pin 100] - A101 [pin 101] - A102 [pin 102] - A103 [pin 103] - A104 [pin 104] - A105 [pin 105] - A106 [pin 106] - A107 [pin 107] - A108 [pin 108] - A109 [pin 109] - A11 [pin 11] - A110 [pin 110] - A111 [pin 111] - A112 [pin 112] - A113 [pin 113] - A114 [pin 114] - A115 [pin 115] - A12 [pin 12] - A13 [pin 13] - A14 [pin 14] - A15 [pin 15] - A16 [pin 16] - A17 [pin 17] - A18 [pin 18] - A19 [pin 19] - A2 [pin 2] - A20 [pin 20] - A21 [pin 21] - A22 [pin 22] - A23 [pin 23] - A24 [pin 24] - A25 [pin 25] - A26 [pin 26] - A27 [pin 27] - A28 [pin 28] - A29 [pin 29] - A3 [pin 3] - A30 [pin 30] - A31 [pin 31] - A32 [pin 32] - A33 [pin 33] - A34 [pin 34] - A35 [pin 35] - A36 [pin 36] - A37 [pin 37] - A38 [pin 38] - A39 [pin 39] - A4 [pin 4] - A40 [pin 40] - A41 [pin 41] - A42 [pin 42] - A43 [pin 43] - A44 [pin 44] - A45 [pin 45] - A46 [pin 46] - A47 [pin 47] - A48 [pin 48] - A49 [pin 49] - A5 [pin 5] - A50 [pin 50] - A51 [pin 51] - A52 [pin 52] - A53 [pin 53] - A54 [pin 54] - A55 [pin 55] - A56 [pin 56] - A57 [pin 57] - A58 [pin 58] - A59 [pin 59] - A6 [pin 6] - A60 [pin 60] - A61 [pin 61] - A62 [pin 62] - A63 [pin 63] - A64 [pin 64] - A65 [pin 65] - A66 [pin 66] - A67 [pin 67] - A68 [pin 68] - A69 [pin 69] - A7 [pin 7] - A70 [pin 70] - A71 [pin 71] - A72 [pin 72] - A73 [pin 73] - A74 [pin 74] - A75 [pin 75] - A76 [pin 76] - A77 [pin 77] - A78 [pin 78] - A79 [pin 79] - A8 [pin 8] - A80 [pin 80] - A81 [pin 81] - A82 [pin 82] - A83 [pin 83] - A84 [pin 84] - A85 [pin 85] - A86 [pin 86] - A87 [pin 87] - A88 [pin 88] - A89 [pin 89] - A9 [pin 9] - A90 [pin 90] - A91 [pin 91] - A92 [pin 92] - A93 [pin 93] - A94 [pin 94] - A95 [pin 95] - A96 [pin 96] - A97 [pin 97] - A98 [pin 98] - A99 [pin 99] - B1 [pin B1] - B10 [pin 10] - B100 [pin 100] - B101 [pin 101] - B102 [pin 102] - B103 [pin 103] - B104 [pin 104] - B105 [pin 105] - B106 [pin 106] - B107 [pin 107] - B108 [pin 108] - B109 [pin 109] - B11 [pin 11] - B110 [pin 110] - B111 [pin 111] - B112 [pin 112] - B113 [pin 113] - B114 [pin 114] - B115 [pin 115] - B12 [pin 12] - B13 [pin 13] - B14 [pin 14] - B15 [pin 15] - B16 [pin 16] - B17 [pin 17] - B18 [pin 18] - B19 [pin 19] - B2 [pin 2] - B20 [pin 20] - B21 [pin 21] - B22 [pin 22] - B23 [pin 23] - B24 [pin 24] - B25 [pin 25] - B26 [pin 26] - B27 [pin 27] - B28 [pin 28] - B29 [pin 29] - B3 [pin 3] - B30 [pin 30] - B31 [pin 31] - B32 [pin 32] - B33 [pin 33] - B34 [pin 34] - B35 [pin 35] - B36 [pin 36] - B37 [pin 37] - B38 [pin 38] - B39 [pin 39] - B4 [pin 4] - B40 [pin 40] - B41 [pin 41] - B42 [pin 42] - B43 [pin 43] - B44 [pin 44] - B45 [pin 45] - B46 [pin 46] - B47 [pin 47] - B48 [pin 48] - B49 [pin 49] - B5 [pin 5] - B50 [pin 50] - B51 [pin 51] - B52 [pin 52] - B53 [pin 53] - B54 [pin 54] - B55 [pin 55] - B56 [pin 56] - B57 [pin 57] - B58 [pin 58] - B59 [pin 59] - B6 [pin 6] - B60 [pin 60] - B61 [pin 61] - B62 [pin 62] - B63 [pin 63] - B64 [pin 64] - B65 [pin 65] - B66 [pin 66] - B67 [pin 67] - B68 [pin 68] - B69 [pin 69] - B7 [pin 7] - B70 [pin 70] - B71 [pin 71] - B72 [pin 72] - B73 [pin 73] - B74 [pin 74] - B75 [pin 75] - B76 [pin 76] - B77 [pin 77] - B78 [pin 78] - B79 [pin 79] - B8 [pin 8] - B80 [pin 80] - B81 [pin 81] - B82 [pin 82] - B83 [pin 83] - B84 [pin 84] - B85 [pin 85] - B86 [pin 86] - B87 [pin 87] - B88 [pin 88] - B89 [pin 89] - B9 [pin 9] - B90 [pin 90] - B91 [pin 91] - B92 [pin 92] - B93 [pin 93] - B94 [pin 94] - B95 [pin 95] - B96 [pin 96] - B97 [pin 97] - B98 [pin 98] - B99 [pin 99] ### J3 — [M.2 Key B Connector](https://www.flux.ai/collinsemasi/mp2-key-b-connector~gf.md) - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet%7F1-1773702-1NGFFQRG-EN%7F0214%7Fpdf%7FEnglish%7FENG_DS_1-1773702-1NGFFQRG-EN_0214_1-1773702-1NGFF-QRG-EN-201402.pdf%7F2199230-3 - Application Specification URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Specification+Or+Standard%7F114-115006%7FC%7Fpdf%7FEnglish%7FENG_SS_114-115006_C.pdf%7F2199230-3 - Role: Connector - Role Details: M.2 Key B/M slot for NPU accelerator module - Manufacturer Name: TE Connectivity - Manufacturer Part Number: 2199230-3 **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 2 [pin 2] - 20 [pin 20] - 21 [pin 21] - 22 [pin 22] - 23 [pin 23] - 24 [pin 24] - 25 [pin 25] - 26 [pin 26] - 27 [pin 27] - 28 [pin 28] - 29 [pin 29] - 3 [pin 3] - 30 [pin 30] - 31 [pin 31] - 32 [pin 32] - 33 [pin 33] - 34 [pin 34] - 35 [pin 35] - 36 [pin 36] - 37 [pin 37] - 38 [pin 38] - 39 [pin 39] - 4 [pin 4] - 40 [pin 40] - 41 [pin 41] - 42 [pin 42] - 43 [pin 43] - 44 [pin 44] - 45 [pin 45] - 46 [pin 46] - 47 [pin 47] - 48 [pin 48] - 49 [pin 49] - 5 [pin 5] - 50 [pin 50] - 51 [pin 51] - 52 [pin 52] - 53 [pin 53] - 54 [pin 54] - 55 [pin 55] - 56 [pin 56] - 57 [pin 57] - 58 [pin 58] - 59 [pin 59] - 6 [pin 6] - 60 [pin 60] - 61 [pin 61] - 62 [pin 62] - 63 [pin 63] - 64 [pin 64] - 65 [pin 65] - 66 [pin 66] - 67 [pin 67] - 68 [pin 68] - 69 [pin 69] - 7 [pin 7] - 70 [pin 70] - 71 [pin 71] - 72 [pin 72] - 73 [pin 73] - 74 [pin 74] - 75 [pin 75] - 8 [pin 8] - 9 [pin 9] - SHIELD [pin S1] - SHIELD__1 [pin S2] ### J4 — [S2B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-sm4-tblfsn~b96.md) - Role Details: 2-pin fan header for board cooling - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Name: JST Sales America Inc. - Manufacturer Part Number: S2B-PH-SM4-TB(LF)(SN) - Role: Connector **Pins:** - P1 [pin 1] - P2 [pin 2] ### J5 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - Part Type: Connector - Role Details: Status LED connector for board bring-up - Role: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] ### TVS1 — SMF05C.TCT - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: SMF05C.TCT - Part Type: TVS Diode - Role Details: ESD/TVS protection for 5V input rail - Datasheet URL: https://www.mouser.com/datasheet/2/761/SEMT_S_A0000305255_1-2575605.pdf - Manufacturer Name: Semtech Corporation - Role: Protection **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] ### U1 — [24C02](https://www.flux.ai/lcsc/24c02~opmf.md) - Package or Case Code: SOP-8_L4.9-W3.9-P1.27-LS6.0-BL - Manufacturer Part Number: 24C02 - Role: Integrated Circuit - Role Details: HAT ID EEPROM on I²C bus - JLCPCB Part Class: Extended Part - Manufacturer Name: HX(恒佳兴) - Part Type: EEPROM - LCSC Part Number: C2984961 **Pins:** - A0 [pin 1] - A1 [pin 2] - A2 [pin 3] - GND [pin 4] - SCL [pin 6] - SDA [pin 5] - VCC [pin 8] - WP [pin 7] ### U2 — [NB680GD-P](https://www.flux.ai/monolithicpower/nb680gd-p~ie.md) - Manufacturer Part Number: NB680GD-P - Role: Power Management - Datasheet URL: https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/NB680 - Package or Case Code: QFN-12_NB680_MNP - Manufacturer Name: Monolithic Power Systems - Product Info Url: https://www.monolithicpower.com/en/catalog/product/view/id/1043?utm_source=ultralibrarian&utm_medium=component_search&utm_campaign=listing - Role Details: 5V→3.3V buck converter (8A) - Product Image Url: https://www.monolithicpower.com/pub/media/catalog/product/N/B/NB680_1043_1.jpg **Pins:** - AGND [pin 10] - BST [pin 8] - CLK [pin 4] - EN [pin 11] - ENCLK [pin 12] - LDO [pin 6] - PG [pin 3] - PGND [pin 2] - SW [pin 7] - VCC [pin 9] - VIN [pin 1] - VOUT [pin 5] ### U3 — [INA181A2IDBVT](https://www.flux.ai/vasyl/ina181a2idbvt~6dd.md) - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fina181 - Role Details: Current-sense amplifier for 5V input shunt monitoring - Part Type: Integrated Circuit - Role: Operational Amplifier (OP-AMP) - Manufacturer Part Number: INA181A2IDBVT **Pins:** - - [pin 4] - + [pin 3] - ~ [pin 1] - GND [pin 2] - REF [pin 5] - V+ [pin 6] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/7flash/fluttering-coral-mrp-fusion~5v](https://www.flux.ai/7flash/fluttering-coral-mrp-fusion~5v).* --- *Generated from [https://www.flux.ai/7flash/fluttering-coral-mrp-fusion~5v](https://www.flux.ai/7flash/fluttering-coral-mrp-fusion~5v)*