# Handicapped Salmon Lightcycle ## Description USB-C to SATA portable external hard drive enclosure controller. Architecture includes USB Type-C 5 V sink input with 5.1 kΩ CC pull-downs, VBUS ESD/TVS and overcurrent protection, USB 3.2 Gen1 SuperSpeed differential pairs into a USB-to-SATA bridge, SATA data and power output for a 2.5-inch drive, regulated 3.3 V logic rail with optional 1.8 V rail if required by the bridge, 25 MHz reference clock, power/activity LEDs, and test points. Design target is compact portable use with stable spin-up power delivery, low EMI, controlled-impedance high-speed routing, and production-grade BOM options. ## Project Details - **Owner:** jefferry - **Created:** 3/19/2026 - **Last Updated:** 3/19/2026 - **Visibility:** Public - **System Architecture:** ```mermaid flowchart TD USBC["USB-C Receptacle"] --> PROT["VBUS Protection and OCP"] PROT --> SYS5["Protected 5V Rail"] SYS5 --> REG33["3.3V Regulator"] REG33 --> BRIDGE["USB to SATA Bridge"] REG33 --> AUX18["Optional 1.8V Regulator"] AUX18 --> BRIDGE USBC --> USBHS["USB 3.x SuperSpeed Pairs"] USBHS --> BRIDGE BRIDGE --> SATA["SATA Data and Power Connector"] XTAL["25MHz Crystal"] --> BRIDGE LEDS["Power and Activity LEDs"] --> BRIDGE TPS["Debug Test Points"] --> SYS5 TPS --> REG33 TPS --> AUX18 TPS --> SATA ``` ## Key Components ### D1 — [SML-D13FWT86C](https://www.flux.ai/jecstronic/sml-d13fwt86c.md) - Role Details: Green power LED indicating 3.3V rail present - Datasheet URL: https://fscdn.rohm.com/en/products/databook/datasheet/opto/led/chip_mono/sml-d13fwt86(c)-e.pdf - Role: Indicator - Package: 0603 - Manufacturer Name: Rohm Semiconductor - Manufacturer Part Number: SML-D13FWT86C - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### D2 — [SML-D13FWT86C](https://www.flux.ai/jecstronic/sml-d13fwt86c.md) - Role Details: Green activity LED driven by bridge status output - Datasheet URL: https://fscdn.rohm.com/en/products/databook/datasheet/opto/led/chip_mono/sml-d13fwt86(c)-e.pdf - Manufacturer Part Number: SML-D13FWT86C - Package: 0603 - Manufacturer Name: Rohm Semiconductor - Part Type: LED - License: https://creativecommons.org/licenses/by/4.0/ - Role: Indicator **Pins:** - A [pin 2] - K [pin 1] ### J1 — [TYPE-C-31-M-12](https://www.flux.ai/vasy_skral/type-c-31-m-12.md) - Manufacturer Part Number: TYPE-C-31-M-12 - Datasheet URL: https://en.krhro.com/npublic/opdfjs/web/viewer.html?file=https%3A%2F%2Fomo-oss-file.thefastfile.com%2Fportal-saas%2Fnew2023011311465142457%2Fcms%2Ffile%2F95f41c83-14fa-41cb-9f86-8d6a717317e5.pdf - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector - Manufacturer Name: Korean Hroparts Elec - Role Details: USB-C input connector for USB 3.x sink device - Symbol Style: Parametric - Package: USB-C Receptacle **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND [pin B1A12] - GND [pin A1B12] - SBU1 [pin A8] - SBU2 [pin B8] - SHIELD [pin S3] - SHIELD [pin S1] - SHIELD [pin S4] - SHIELD [pin S2] - VBUS [pin B4A9] - VBUS [pin A4B9] ### J2 — [1735944-1](https://www.flux.ai/adrian95/1735944-1.md) - Role: Connector - Role Details: Combined SATA data and power connector for 2.5-inch HDD or SSD - Package or Case Code: 17359441 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1735944&DocType=Customer+Drawing&DocLang=English - Manufacturer Name: TE Connectivity - Package: SATA 22-pin SMT - Part Type: Connector - Manufacturer Part Number: 1735944-1 **Pins:** - MP1 [pin MP1] - MP2 [pin MP2] - P1 [pin P1] - P10 [pin P10] - P11 [pin P11] - P12 [pin P12] - P13 [pin P13] - P14 [pin P14] - P15 [pin P15] - P2 [pin P2] - P3 [pin P3] - P4 [pin P4] - P5 [pin P5] - P6 [pin P6] - P7 [pin P7] - P8 [pin P8] - P9 [pin P9] - S1 [pin S1] - S2 [pin S2] - S3 [pin S3] - S4 [pin S4] - S5 [pin S5] - S6 [pin S6] - S7 [pin S7] ### U2 — [TPS259531DSGT](https://www.flux.ai/lcsc/tps259531dsgt.md) - Role Details: USB VBUS e-fuse and inrush/current limiting for protected 5V rail - Manufacturer Name: TI(德州仪器) - Package: WSON-8 - Package or Case Code: WSON-8_L2.0-W2.0-P0.50-TL-EP - Manufacturer Part Number: TPS259531DSGT - JLCPCB Part Class: Extended Part - Role: Input Protection - LCSC Part Number: C1848342 **Pins:** - ~{FLT} [pin 6] - dVdt [pin 1] - EN/UVLO [pin 2] - EP [pin 9] - GND [pin 8] - ILM [pin 7] - IN [pin 3] - IN [pin 4] - OUT [pin 5] ### U3 — [TPD4EUSB30DQAR](https://www.flux.ai/vasy_skral/tpd4eusb30dqar.md) - Manufacturer Name: Texas Instruments - Part Type: Protection - Manufacturer Part Number: TPD4EUSB30DQAR - Role Details: Low-capacitance protection for USB 3.x SuperSpeed differential pairs - Package: USON-10 - Role: ESD Protection - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftpd4eusb30 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - D1- [pin 2] - D1+ [pin 1] - D2- [pin 5] - D2+ [pin 4] - GND [pin 8] - GND [pin 3] - NC [pin 10] - NC [pin 6] - NC [pin 7] - NC [pin 9] ### U4 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1.md) - Datasheet URL: Diodes Incorporated - Manufacturer Name: https://www.diodes.com/assets/Datasheets/AP2112.pdf - Package: SOT-25 - Role Details: Main 3.3V rail derived from protected USB 5V input - Part Type: Integrated Circuit - Manufacturer Part Number: AP2112K-3.3TRG1 - Role: Regulator - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] ### U5 — [AP2112K-1.8TRG1](https://www.flux.ai/adrian95/ap2112k-18trg1.md) - Manufacturer Name: Diodes Incorporated - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP2112.pdf - Role: Regulator - Manufacturer Part Number: AP2112K-1.8TRG1 - Part Type: Integrated Circuit - Package: SOT-25 - Role Details: Optional 1.8V auxiliary rail for bridge core or PHY supply variants **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] ### Y1 — [NX3225GA-25MHZ-STD-CRG-2](https://www.flux.ai/lcsc/nx3225ga-25mhz-std-crg-2.md) - Role: Timing - Package: 3225 - Manufacturer Part Number: NX3225GA-25MHZ-STD-CRG-2 - Part Type: Crystals - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_NDK-NX3225GA-25MHZ-STD-CRG-2_C438901.pdf - Package or Case Code: OSC-SMD_4P-L3.2-W2.5-BL - Product Info Url: https://lcsc.com/product-detail/SMD-Crystal-Resonators_NDK-NX3225GA-STD-CRG-2-25MHZ_C438901.html - Role Details: 25MHz reference clock for USB-to-SATA bridge - JLCPCB Part Class: Extended Part - LCSC Part Number: C438901 - Manufacturer Name: NDK **Pins:** - 1 [pin 1] - 3 [pin 3] - GND [pin 4] - GND [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/jefferry/handicapped-salmon-lightcycle](https://www.flux.ai/jefferry/handicapped-salmon-lightcycle).* --- *Generated from [https://www.flux.ai/jefferry/handicapped-salmon-lightcycle](https://www.flux.ai/jefferry/handicapped-salmon-lightcycle)*