# Regional Salmon KITT ## Description USB-C VBUS Integration with Onboard Li-ion Charger and Power-Path for Dual Laser Drivers ## Project Details - **Owner:** golfsaber - **Created:** 12/20/2025 - **Last Updated:** 12/20/2025 - **Visibility:** Public - **PCB Layout Size:** 14.0 mm x 10.0 mm - **System Architecture:** flowchart TD MicroHeader --> PullDownResistors PullDownResistors --> ESDTVSDiodes ESDTVSDiodes --> RCNetwork RCNetwork --> LiIonCharger LiIonCharger --> PowerPathController PowerPathController --> LaserDrivers - **Power Requirements:** USB - **Part Type:** Power Management - **License:** https://www.gnu.org/licenses/gpl-3.0.html - **Domain:** Consumer Electronics - **Connectivity:** USB ## Key Components ### D1 — [ESD321DPYR](https://www.flux.ai/corvus96/esd321dpyr.md) - Package: SMD_0402_1005Metric - Manufacturer Name: Texas Instruments - Diode Type: ESD - Part Type: Diode - Max Reverse Voltage: 5V - Manufacturer Part Number: ESD321DPYR - Datasheet URL: https://www.ti.com/lit/ds/symlink/esd321.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1690491326127&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Fesd321 - Role Details: ESD protection for USB D+ data line - Role: Protection **Pins:** - GND [pin 2] - IO [pin 1] ### D2 — [ESD321DPYR](https://www.flux.ai/corvus96/esd321dpyr.md) - Max Reverse Voltage: 5V - Diode Type: ESD - Manufacturer Name: Texas Instruments - Part Type: Diode - Package: SMD_0402_1005Metric - Role Details: ESD protection for USB D- data line - Datasheet URL: https://www.ti.com/lit/ds/symlink/esd321.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1690491326127&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Fesd321 - Manufacturer Part Number: ESD321DPYR - Role: Protection **Pins:** - GND [pin 2] - IO [pin 1] ### J1 — [Pin Header 01x07 2.00mm Horizontal](https://www.flux.ai/adrian95/pin-header-01x07-200mm-horizontal.md) - Connector Pitch: 2mm - Connector Gender: Male - Part Type: Connector - Mount: Through Hole - Connector Positions: 7 - Package or Case Code: PinHeader_1x07_P2.00mm_Horizontal - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Micro header for USB-C harness interface (VBUS, GND, CC1, CC2, D+, D-, Shield) - Role: Connector - KiCAD Library Reference: PinHeader_1x07_P2.00mm_Horizontal - Connector Rows: 1 - Connector Type: Headers and Wire Housings **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] - Pin_7 [pin 7] ### U1 — [MCP73831T-5ACI/OT](https://www.flux.ai/adrian95/mcp73831t-5aciot.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role: Power Conversion - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP73831-Family-Data-Sheet-DS20001984H.pdf - Package: SOT-23-5 - Part Type: Integrated Circuit - Manufacturer Part Number: MCP73831T-5ACI/OT - Manufacturer Name: Microchip Technology - Role Details: Li-ion battery charger for USB VBUS input **Pins:** - PROG [pin 5] - STAT [pin 1] - VBAT [pin 3] - VIN [pin 4] - VSS [pin 2] ### U2 — [BQ24075TRGTR](https://www.flux.ai/adrian95/bq24075trgtr.md) - Datasheet URL: http://componentsearchengine.com/Datasheets/1/BQ24075TRGTR.pdf - Role Details: Power-path controller for SYS/BAT output - Role: Power Path Management - Package: QFN50P300X300X100-17N-D - License: https://creativecommons.org/licenses/by/4.0/ - Package or Case Code: QFN50P300X300X100-17N-D - Manufacturer Name: Texas Instruments - Manufacturer Part Number: BQ24075TRGTR - Part Type: Integrated Circuit **Pins:** - ~CE [pin 4] - ~CHG [pin 9] - ~PGOOD [pin 7] - BAT_1 [pin 2] - BAT_2 [pin 3] - EN1 [pin 6] - EN2 [pin 5] - EP [pin 17] - ILIM [pin 12] - IN [pin 13] - ISET [pin 16] - OUT_1 [pin 10] - OUT_2 [pin 11] - SYSOFF [pin 15] - TMR [pin 14] - TS [pin 1] - VSS [pin 8] ### U3 — [MAX3949ETE+T](https://www.flux.ai/lcsc/max3949eteplust.md) - Part Type: Laser Drivers - Manufacturer Part Number: MAX3949ETE+T - Package: QFN-16_L3.0-W3.0-P0.50-TL-EP1.1 - JLCPCB Part Class: Extended Part - Role Details: Dual laser diode driver for two laser diodes - Role: Laser Drivers - LCSC Part Number: C2988285 - Manufacturer Name: ADI(亚德诺)/MAXIM(美信) - Package or Case Code: QFN-16_L3.0-W3.0-P0.50-TL-EP1.1 **Pins:** - BIAS [pin 9] - BMON [pin 4] - CSEL [pin 10] - DISABLE [pin 1] - EP [pin 17] - FAULT [pin 3] - SCL [pin 12] - SDA [pin 11] - TIN- [pin 15] - TIN+ [pin 14] - TOUT- [pin 6] - TOUT+ [pin 7] - VCC [pin 13] - VCC [pin 16] - VCCT [pin 8] - VCCT [pin 5] - VSEL [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/golfsaber/regional-salmon-kitt](https://www.flux.ai/golfsaber/regional-salmon-kitt).* --- *Generated from [https://www.flux.ai/golfsaber/regional-salmon-kitt](https://www.flux.ai/golfsaber/regional-salmon-kitt)*