# ChargeGuard Gateway ## Description ChargeGuard Gateway - PCB layout review status: schematic power tree review is clean; remaining work is PCB-layout-only cleanup. Current DRC inventory: 136 Overlapping Copper, 56 Floating Copper, 88 Airwires, 0 Missing Footprints, 0 Invalid Layer, 0 Important Overrides. Priority 1: protected input and power-path regions around VIN_PROTECTED, VIN_FILTERED, +5V_MAIN, +3V3_MAIN because these can block reliable routing and copper pours. Manual PCB editor tasks: remove/reshape overlapping copper, reconnect broken traces or redraw routes causing airwires, delete stranded copper islands, inspect ambiguous pad-to-trace shorts around power devices and connectors. Agent-preparable tasks: maintain issue inventory, classify nets and priorities, preserve stackup/documentation, define DRC recheck loop, and guide Auto-Layout sequencing after manual copper cleanup. Recheck loop: fix one issue class or one critical region at a time, rerun DRC, confirm counts decrease, then move to next batch until airwires/floating copper/overlaps are zero. Completion checklist: 1) clear power-path overlaps, 2) remove floating copper islands, 3) close all airwires, 4) rerun DRC after each batch, 5) confirm clean layout before manufacturing export. ## Project Details - **Owner:** aysenuur23 - **Created:** 3/19/2026 - **Last Updated:** 3/19/2026 - **Visibility:** Public - **Power Tree:** 12-48V DC -> protected input -> 5V main rail -> 3.3V secondary rail - **Power Requirements:** Input rail family includes VIN_PROTECTED and VIN_FILTERED from 12-48V DC source; regulated rails are +5V_MAIN and +3V3_MAIN - **Main Power Input:** 12-48V DC - **System Architecture:** ```mermaid flowchart TD Vin[12-48V DC Input] --> Protect[Input Protection and EMI] Protect --> Buck5[5V Main Buck] Buck5 --> Rail5[+5V_MAIN] Rail5 --> Buck33[3.3V Main Buck or LDO] Buck33 --> Rail33[+3V3_MAIN] Rail5 --> CM4[CM4 8GB 32GB eMMC WiFi BLE] Rail5 --> Coral[Coral Mini PCIe] Rail5 --> LTE[EC200U LTE] Rail33 --> STM32[STM32H743] Rail33 --> Sensors[SHT40 GNSS ATM90E32AS Logic] Rail5 --> IsoPwr[Isolated Field Power] IsoPwr --> ISO5[ISO 5V or ISO 3V3] STM32 --> USB[USB 2.0 to CM4] STM32 --> UART[UART to CM4 and Debug] CM4 --> PCIe[PCIe to Coral] STM32 --> Meter[Metering and Temp Inputs] STM32 --> Field[Isolated RS485 CAN DIs DOs] ``` - **Input Stage Notes:** Protected DC entry uses fused input, P-channel MOSFET reverse polarity protection, SMBJ58A TVS clamp to GND, and LC filter with 10uH plus 100nF and 10uF shunt capacitors before distribution to downstream regulators. - **Operating Voltage:** 12-48V DC - **Voltage:** 48V - **Board Dimensions:** 150 mm x 100 mm - **Primary Interconnect:** USB 2.0 between STM32H743 and CM4 - **Input Protection Chain:** J1 -> F1 -> Q1 -> D1 -> L1/C1/C2/C3/C4 -> VIN_FILTERED - **Protected Input Rail:** Fused, reverse-polarity protected, TVS-clamped, EMI-filtered 12-48V DC rail for downstream regulation - **Protected Input Net Name:** VIN_FILTERED - **Layer Count:** 4 - **Secondary Interconnect:** UART between STM32H743 and CM4 - **Input Protection Requirements:** Reverse polarity protection, fuse or eFuse, TVS protection, and EMI filter required on main 12-48V DC input - **Input Voltage Range:** 12-48V DC - **Architecture:** STM32H743 + CM4 8GB/32GB eMMC/WiFi-BLE + Coral Mini PCIe - **Card Name:** ChargeGuard Gateway ## Key Components ### D1 — [SMBJ58A-HR](https://www.flux.ai/lcsc/smbj58a-hr.md) - Role Details: Unidirectional TVS clamp from protected high-voltage rail to ground - Part Type: TVS - Package or Case Code: SMB_L4.3-W3.6-LS5.4-RD - Manufacturer Part Number: SMBJ58A-HR - Role: TVS - Package: SMB_L4.3-W3.6-LS5.4-RD - JLCPCB Part Class: Extended Part - LCSC Part Number: C1977350 - Manufacturer Name: Littelfuse(美国力特) **Pins:** - A [pin 2] - K [pin 1] ### D2 — [Generic Diode](https://www.flux.ai/jharwinbarrozo/generic-diode-1l3gh.md) - Part Type: Diode - Role Details: Gate-to-source clamp diode for P-channel MOSFET VGS protection on 12-48V input - Package: SMD_SOD-123 - Role: Gate Clamp **Pins:** - A [pin 2] - K [pin 1] ### F1 — [JFC1206-1300FS](https://www.flux.ai/lcsc/jfc1206-1300fs.md) - JLCPCB Part Class: Extended Part - LCSC Part Number: C136347 - Role: Current Limit - Manufacturer Part Number: JFC1206-1300FS - Role Details: 3A 63V input fuse ahead of downstream protection - Manufacturer Name: JDTfuse(集电通) - Package or Case Code: F1206 - Part Type: Fuses - Package: F1206 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2305151206_Shenzhen-JDT-Fuse-JFC1206-1300FS_C136347.pdf - Product Info Url: https://lcsc.com/product-detail/Surface-Mount-Fuses_3A-63V_C136347.html **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [KF128-5.08-2P-AA](https://www.flux.ai/lcsc/kf128-5p08-2p-aa.md) - Connector Rows: 1 - Product Info Url: https://lcsc.com/product-detail/New-Quadratic-Unclassified-Data_Cixi-Kefa-Elec-KF128-5-08-2P_C474952.html - Role: Power Input - Operating Temperature: -40℃~+105℃ - Connector Positions: 2 - JLCPCB Part Class: Extended Part - Connector Pitch: 5.08mm - LCSC Part Number: C474952 - Part Type: Screw terminal - Current Rating: 24A - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2408211511_Cixi-Kefa-Elec-KF128-5-08-2P-AA_C474952.pdf - Manufacturer Part Number: KF128-5.08-2P-AA - Role Details: 12-48V DC input connector for protected gateway input stage - Manufacturer Name: KEFA(科发) - Connector Type: Screw terminal - Connector Gender: Female - Package: CONN-TH_P5.08_KF128-5.08-2P - Package or Case Code: CONN-TH_P5.08_KF128-5.08-2P **Pins:** - 1 [pin 1] - 2 [pin 2] ### J2 — [DF40C-100DS-0.4V(51)](https://www.flux.ai/lcsc/df40c-100ds-0p4v51.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_HRS-Hirose-DF40C-100DS-0-4V-51_C597931.pdf - Role: CM4 Socket - Current Rating: 300mA - Role Details: CM4 connector A for fixed Compute Module 4 variant: 8GB RAM, 32GB eMMC, Wi-Fi/BLE - LCSC Part Number: C597931 - Connector Positions: 100 - Operating Temperature: -35℃~+85℃ - Package or Case Code: CONN-SMD_DF40C-100DS-0.4V-51 - Connector Pitch: 0.4mm - Product Info Url: https://lcsc.com/product-detail/presales_HRS-Hirose-HRS-DF40C-100DS-0-4V-51_C597931.html - Fixed Variant: CM4 8GB RAM + 32GB eMMC + Wi-Fi/BLE - Package: CONN-SMD_DF40C-100DS-0.4V-51 - Manufacturer Part Number: DF40C-100DS-0.4V(51) - Manufacturer Name: HRS(广濑) - JLCPCB Part Class: Extended Part - Part Type: Mezzanine Connectors (Board to Board) **Pins:** - 1 [pin 1] - 10 [pin 10] - 100 [pin 100] - 11 [pin 11] - 12 [pin 12] - 13 [pin 13] - 14 [pin 14] - 15 [pin 15] - 16 [pin 16] - 17 [pin 17] - 18 [pin 18] - 19 [pin 19] - 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] - 76 [pin 76] - 77 [pin 77] - 78 [pin 78] - 79 [pin 79] - 8 [pin 8] - 80 [pin 80] - 81 [pin 81] - 82 [pin 82] - 83 [pin 83] - 84 [pin 84] - 85 [pin 85] - 86 [pin 86] - 87 [pin 87] - 88 [pin 88] - 89 [pin 89] - 9 [pin 9] - 90 [pin 90] - 91 [pin 91] - 92 [pin 92] - 93 [pin 93] - 94 [pin 94] - 95 [pin 95] - 96 [pin 96] - 97 [pin 97] - 98 [pin 98] - 99 [pin 99] ### J3 — [DF40C-100DS-0.4V(51)](https://www.flux.ai/lcsc/df40c-100ds-0p4v51.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_HRS-Hirose-DF40C-100DS-0-4V-51_C597931.pdf - Package: CONN-SMD_DF40C-100DS-0.4V-51 - Current Rating: 300mA - Connector Positions: 100 - LCSC Part Number: C597931 - Fixed Variant: CM4 8GB RAM + 32GB eMMC + Wi-Fi/BLE - Operating Temperature: -35℃~+85℃ - Connector Pitch: 0.4mm - Product Info Url: https://lcsc.com/product-detail/presales_HRS-Hirose-HRS-DF40C-100DS-0-4V-51_C597931.html - Package or Case Code: CONN-SMD_DF40C-100DS-0.4V-51 - Manufacturer Part Number: DF40C-100DS-0.4V(51) - Role: CM4 Socket - Manufacturer Name: HRS(广濑) - Role Details: CM4 connector B for fixed Compute Module 4 variant: 8GB RAM, 32GB eMMC, Wi-Fi/BLE - Part Type: Mezzanine Connectors (Board to Board) - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] - 10 [pin 10] - 100 [pin 100] - 11 [pin 11] - 12 [pin 12] - 13 [pin 13] - 14 [pin 14] - 15 [pin 15] - 16 [pin 16] - 17 [pin 17] - 18 [pin 18] - 19 [pin 19] - 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] - 76 [pin 76] - 77 [pin 77] - 78 [pin 78] - 79 [pin 79] - 8 [pin 8] - 80 [pin 80] - 81 [pin 81] - 82 [pin 82] - 83 [pin 83] - 84 [pin 84] - 85 [pin 85] - 86 [pin 86] - 87 [pin 87] - 88 [pin 88] - 89 [pin 89] - 9 [pin 9] - 90 [pin 90] - 91 [pin 91] - 92 [pin 92] - 93 [pin 93] - 94 [pin 94] - 95 [pin 95] - 96 [pin 96] - 97 [pin 97] - 98 [pin 98] - 99 [pin 99] ### J4 — [MM60-52B1-E1-R650](https://www.flux.ai/adrian95/mm60-52b1-e1-r650.md) - Manufacturer Name: JAE Electronics - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Package: Mini PCIe Socket - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/409/CardConn_SIM_CF_DIMM_PCIe_PG_V2.2.pdf - Installed Module: Google Coral Mini PCIe Accelerator - Role Details: Mini PCIe socket dedicated to Coral accelerator connected to CM4 PCIe lane - Manufacturer Part Number: MM60-52B1-E1-R650 - Role: Mini PCIe Socket **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 12 [pin 12] - 13 [pin 13] - 14 [pin 14] - 15 [pin 15] - 16 [pin 16] - 17 [pin 17] - 18 [pin 18] - 19 [pin 19] - 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] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] - MP1 [pin MP1] - MP2 [pin MP2] ### Q1 — [NCE60P50K](https://www.flux.ai/lcsc/nce60p50k.md) - Datasheet URL: https://www.lcsc.com/datasheet/lcsc_datasheet_1809291512_Wuxi-NCE-Power-Semiconductor-NCE60P50K_C130104.pdf - Power: 95W - Role Details: P-channel MOSFET reverse polarity protection for 12-48V input - Drain to Source Voltage: 60V - LCSC Part Number: C130104 - Package: TO-252-2_L6.6-W6.1-P4.57-LS9.9-TL-CW - Package or Case Code: TO-252-2_L6.6-W6.1-P4.57-LS9.9-TL-CW - Role: Reverse Protection - Manufacturer Name: NCE(无锡新洁能) - Manufacturer Part Number: NCE60P50K - Product Info Url: https://lcsc.com/product-detail/MOSFET_NCE60P50K_C130104.html - Continuous Drain Current: 50A - Transistor Type: 1 Piece P-Channel - Part Type: MOSFETs - JLCPCB Part Class: Extended Part - Operating Temperature: -55℃~+150℃ **Pins:** - D [pin 2] - G [pin 1] - S [pin 3] ### U1 — [ISL854102FRZ-T](https://www.flux.ai/adrian95/isl854102frz-t.md) - Package: VFDFN-12 EP - Manufacturer Part Number: ISL854102FRZ-T - Role: Main Buck - Voltage: 48V - Datasheet URL: https://www.mouser.com/datasheet/2/698/REN_isl854102_DST_20131109-1998537.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Renesas Electronics Corporation - Role Details: Primary 12-48V to 5V regulator for CM4, Coral, LTE, and auxiliary 5V loads - Part Type: Integrated Circuit **Pins:** - BOOT [pin 3] - COMP [pin 11] - EN [pin 7] - FB [pin 10] - FS [pin 12] - GND [pin 13] - PG [pin 8] - PGND [pin 6] - PHASE [pin 5] - SS [pin 1] - SYNC [pin 2] - VCC [pin 9] - VIN [pin 4] ### U2 — [ISL854102FRZ-T](https://www.flux.ai/adrian95/isl854102frz-t.md) - Manufacturer Name: Renesas Electronics Corporation - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.mouser.com/datasheet/2/698/REN_isl854102_DST_20131109-1998537.pdf - Part Type: Integrated Circuit - Voltage: 5V - Role Details: 5V to 3.3V regulator for STM32H743, sensors, and logic loads - Manufacturer Part Number: ISL854102FRZ-T - Package: VFDFN-12 EP - Role: Secondary Buck **Pins:** - BOOT [pin 3] - COMP [pin 11] - EN [pin 7] - FB [pin 10] - FS [pin 12] - GND [pin 13] - PG [pin 8] - PGND [pin 6] - PHASE [pin 5] - SS [pin 1] - SYNC [pin 2] - VCC [pin 9] - VIN [pin 4] ### U3 — [STM32H743ZIT6](https://www.flux.ai/vasy_skral/stm32h743zit6.md) - Part Type: Microcontroller - Role: Main MCU - Role Details: STM32H743 minimum system controller for gateway supervision and sensor/logic handling - Datasheet URL: https://www.st.com/resource/en/datasheet/stm32h743bi.pdf - Manufacturer Name: STMicroelectronics - Package: LQFP-144 - Manufacturer Part Number: STM32H743ZIT6 **Pins:** - BOOT0 [pin 138] - NRST [pin 25] - PA0 [pin 34] - PA1 [pin 35] - PA10 [pin 102] - PA11 [pin 103] - PA12 [pin 104] - PA13 [pin 105] - PA14 [pin 109] - PA15 [pin 110] - PA2 [pin 36] - PA3 [pin 37] - PA4 [pin 40] - PA5 [pin 41] - PA6 [pin 42] - PA7 [pin 43] - PA8 [pin 100] - PA9 [pin 101] - PB0 [pin 46] - PB1 [pin 47] - PB10 [pin 69] - PB11 [pin 70] - PB12 [pin 73] - PB13 [pin 74] - PB14 [pin 75] - PB15 [pin 76] - PB2 [pin 48] - PB3 [pin 133] - PB4 [pin 134] - PB5 [pin 135] - PB6 [pin 136] - PB7 [pin 137] - PB8 [pin 139] - PB9 [pin 140] - PC0 [pin 26] - PC1 [pin 27] - PC10 [pin 111] - PC11 [pin 112] - PC12 [pin 113] - PC13 [pin 7] - PC14 [pin 8] - PC15 [pin 9] - PC2_C [pin 28] - PC3_C [pin 29] - PC4 [pin 44] - PC5 [pin 45] - PC6 [pin 96] - PC7 [pin 97] - PC8 [pin 98] - PC9 [pin 99] - PD0 [pin 114] - PD1 [pin 115] - PD10 [pin 79] - PD11 [pin 80] - PD12 [pin 81] - PD13 [pin 82] - PD14 [pin 85] - PD15 [pin 86] - PD2 [pin 116] - PD3 [pin 117] - PD4 [pin 118] - PD5 [pin 119] - PD6 [pin 122] - PD7 [pin 123] - PD8 [pin 77] - PD9 [pin 78] - PDR_ON [pin 143] - PE0 [pin 141] - PE1 [pin 142] - PE10 [pin 63] - PE11 [pin 64] - PE12 [pin 65] - PE13 [pin 66] - PE14 [pin 67] - PE15 [pin 68] - PE2 [pin 1] - PE3 [pin 2] - PE4 [pin 3] - PE5 [pin 4] - PE6 [pin 5] - PE7 [pin 58] - PE8 [pin 59] - PE9 [pin 60] - PF0 [pin 10] - PF1 [pin 11] - PF10 [pin 22] - PF11 [pin 49] - PF12 [pin 50] - PF13 [pin 53] - PF14 [pin 54] - PF15 [pin 55] - PF2 [pin 12] - PF3 [pin 13] - PF4 [pin 14] - PF5 [pin 15] - PF6 [pin 18] - PF7 [pin 19] - PF8 [pin 20] - PF9 [pin 21] - PG0 [pin 56] - PG1 [pin 57] - PG10 [pin 125] - PG11 [pin 126] - PG12 [pin 127] - PG13 [pin 128] - PG14 [pin 129] - PG15 [pin 132] - PG2 [pin 87] - PG3 [pin 88] - PG4 [pin 89] - PG5 [pin 90] - PG6 [pin 91] - PG7 [pin 92] - PG8 [pin 93] - PG9 [pin 124] - PH0 [pin 23] - PH1 [pin 24] - VBAT [pin 6] - VCAP1 [pin 71] - VCAP2 [pin 106] - VDD [pin 62] - VDD [pin 84] - VDD [pin 39] - VDD [pin 30] - VDD [pin 17] - VDD [pin 121] - VDD [pin 72] - VDD [pin 131] - VDD [pin 108] - VDD [pin 144] - VDD [pin 52] - VDD33_USB [pin 95] - VDDA [pin 33] - VREF+ [pin 32] - VSS [pin 107] - VSS [pin 16] - VSS [pin 130] - VSS [pin 83] - VSS [pin 61] - VSS [pin 51] - VSS [pin 120] - VSS [pin 94] - VSS [pin 38] - VSSA [pin 31] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/aysenuur23/chargeguard-gateway](https://www.flux.ai/aysenuur23/chargeguard-gateway).* --- *Generated from [https://www.flux.ai/aysenuur23/chargeguard-gateway](https://www.flux.ai/aysenuur23/chargeguard-gateway)*