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A KiCad 9.0 carrier board for the Teensy 4.x microcontroller, designed for real-time audio sensing with USB-C Power Delivery input, 4S Li-ion battery management, I2S MEMS microphone, and LED lighting outputs.
The design uses KiCad hierarchical sheets:
| Page | Sub-sheet | File |
|---|---|---|
| 1 | Top level | Sound Sensor Teensy Carrier.kicad_sch |
| 2 | USB-C Connector | usb-c-connector.kicad_sch |
| 3 | USB-PD Controller | usb-pd-controller.kicad_sch |
| 4 | Battery Charger | battery-charger.kicad_sch |
| 5 | DC Converters | dc-converters.kicad_sch |
| 6 | MCU | mcu.kicad_sch |
| 7 | Battery Protector | battery_protector.kicad_sch |
| 8 | Mic Boom | mic_boom.kicad_sch |
| 9 | WL-SUMW UV LED Board | wl-sumw_uv_led_board.kicad_sch |
| 10 | White LED Board | white_led_board.kicad_sch |
USB-C (5 V–20 V PD)
└─ TPS25751 USB-PD Controller
└─ VBUS / +5 V rail
├─ TPS54538 Buck → +3.3 V (MCU, logic, microphone)
└─ BQ25798 Charger → 4S Li-ion pack (14.8 V–16.8 V)
└─ BQ7791500 Protection
| Function | Part | Manufacturer |
|---|---|---|
| USB-PD Controller | TPS25751DREFR | Texas Instruments |
| PD Config EEPROM | 24LC256-I/SN | Microchip |
| Battery Charger | BQ25798RQMR | Texas Instruments |
| Battery Protector | BQ7791500PWR | Texas Instruments |
| Disconnect FET | IQDH35N03LM5ATMA1 | Infineon |
| NTC Thermistor | 103AT-2 (10 kΩ) | Semitec |
| Buck Converter | TPS54538RQFR | Texas Instruments |
| MEMS Microphone | ICS-43434 | TDK |
| White LED Driver | TPS923652DRRR | Texas Instruments |
| UV LED Driver | TPS92200D2DDCR | Texas Instruments |
| Signal | Teensy Interface | Description |
|---|---|---|
I2S.BCLK / SD / WS | I2S2 | ICS-43434 microphone |
MCU_I2C.SCL/SDA/IRQ | I2C | Charger + PD controller |
LED.ONSET_EN/ADIM | PWM | White LED onset channel |
LED.BEAT1_EN/ADIM | PWM | White LED beat channel 1 |
LED.BEAT2_EN/ADIM | PWM | White LED beat channel 2 |
Sound Sensor Teensy Carrier Kicad/
├── Sound Sensor Teensy Carrier.kicad_pro # Project file
├── Sound Sensor Teensy Carrier.kicad_pcb # PCB layout (panel)
├── Sound Sensor Teensy Carrier.kicad_sch # Top-level schematic
├── battery-charger.kicad_sch
├── battery_protector.kicad_sch
├── dc-converters.kicad_sch
├── mcu.kicad_sch
├── mic_boom.kicad_sch
├── usb-c-connector.kicad_sch
├── usb-pd-controller.kicad_sch
├── white_led_board.kicad_sch
├── wl-sumw_uv_led_board.kicad_sch
├── seperate.zsh # kikit panel extraction script
├── ibom.config.ini # Interactive BOM config
└── freerouting.dsn # Freerouting export
| Tool | Purpose | Install |
|---|---|---|
| KiCad 9.0 | EDA (schematic + layout) | kicad.org |
| kikit | Panel sub-board extraction | pip install kikit |
| InteractiveHtmlBom | BOM generation | KiCad plugin manager |
The PCB is laid out as a panel. seperate.zsh uses kikit separate to extract individual sub-boards by board-array reference designator into output/<name>/:
./seperate.zsh
Edit the script to enable/disable specific boards (B1–B6). Extracted boards are written to output/<board-name>/<board-name>.kicad_pcb.
Open the project in KiCad and run the Interactive HTML BOM plugin. Output lands in bom/ibom.html per ibom.config.ini. Key BOM fields: Value, Footprint, MPN, Manufacturer, Datasheet, Category.
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