Cryptick token pcb

Cryptick Token Hardware PCB

Hardware schematics, 2-layer PCB layout, and manufacturing files for Cryptick Token — the 100% open-source biometric hardware security key and cryptographic hardware enclave.

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Hardware Highlights

• Main Processing Unit: Espressif ESP32-S3-WROOM-1 (N16R8) Dual-Core Xtensa LX7 @ 240 MHz with hardware cryptography accelerators (AES-256, SHA-256, RSA-3072, ECC point multiplication, TRNG) and 16 MB encrypted SPI Flash.
• Biometric Security Enclave: R558S optical/capacitive fingerprint sensor connector (J4, 6-pin JST SH) wired for UART (TX GPIO 17, RX GPIO 18) plus a hardware wake-on-touch interrupt on GPIO 16. (Sensor-internal specs such as DPI and template capacity come from the module's own datasheet, not this schematic, and are not re-verified here.)
• Physical WYSIWYS Display: Driven primarily through a 20-pin FPC connector (FPC1) — SPI (CS0 GPIO 10, SCK GPIO 12, SDO GPIO 11), RS/RESET on GPIO 47/48, and a GPIO 42-switched NMOS LED backlight (Q1) — with a touch-controller interrupt/reset pair on GPIO 1/2. A secondary 4-pin I2C header (J3, labeled "OLED Display" in the schematic) taps the same I2C bus (SDA GPIO 8, SCL GPIO 9). See docs/ARCHITECTURE.md for the full netlist-verified wiring — the specific panel controller IC and pixel resolution are not encoded anywhere in the KiCad source, so they are not asserted here.
• Real-Time Clock: Maxim DS3231M I2C RTC (±5ppm, U1) on the shared I2C bus, with its own coin-cell backup supply (BT1) so it keeps time through power loss — the time source behind this device's TOTP codes.
• Physical Navigation: 5-Way Tactile Navigation Switch (SW1, net labels /UP→GPIO6, /DOWN→GPIO5, /LEFT→GPIO7, /RIGHT→GPIO4, /CENTER→GPIO15 per the schematic's own net names) for tactile PIN entry, menu navigation, and physical user presence (UP) confirmation, plus an ALPS EC05E1220401 quadrature rotary encoder (SW2, channel A/CW on GPIO 40, channel B/CCW on GPIO 41) for scroll navigation. The encoder's integrated pushbutton is wired straight to GND on this revision, not to a GPIO — there is no separate "encoder click" signal.

  Known conflict, not yet resolved — do not treat either source as settled: the firmware's include/board_config.h assigns UP_BUTTON_PIN=7, LEFT_BUTTON_PIN=6 (GPIO4/5 for RIGHT/DOWN match), the opposite of this schematic's /UP//LEFT net labels, with a comment dated 2026-08-08 citing an actual flashed-hardware bring-up log as the source ("pairs were swapped vs first silk guess — UP↔LEFT... corrected here"). That firmware pin map predates this schematic re-read and was reportedly verified against a real, physically assembled board — a schematic net name only records what the designer called a pad, not which way the switch's internal actuator physically moves it, so a live bring-up test is the stronger of the two sources in general. But this schematic's current net names weren't re-verified against actual silkscreen/part orientation either. Do not change board_config.h to match the net names above without confirming on real hardware first — if the firmware mapping is the one that's actually correct, "fixing" it to match this schematic would swap UP/LEFT and DOWN/RIGHT on a real device.

• Wireless & Wired Interfaces:
  • Bluetooth Low Energy (BLE 5.0) via onboard 2.4 GHz PCB antenna.
  • Native USB Type-C Receptacle (USB 2.0 Full-Speed OTG) with bidirectional TVS diode ESD protection (USBLC6-2SC6).
• Power Management:
  • TI BQ25185DLHR LiPo/Li-Ion linear battery charge management with dual status monitoring (STAT1 GPIO 38, STAT2 GPIO 39).
  • High-efficiency 3.3V LDO regulator with low quiescent current for ultra-deep sleep.
  • Single fixed (non-addressable) power-present LED (D1, 0603). GPIO48/PIN_NEOPIXEL is generic ESP32-S3 Arduino-variant boilerplate inherited from a reference dev-board file — there is no WS2812B or any addressable RGB LED on this board.

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PCB Specifications

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Schematic & Manufacturing Files

• Schematic source: cryptick-token-pcb.kicad_sch
• Board layout: cryptick-token-pcb.kicad_pcb
• KiCad project: cryptick-token-pcb.kicad_pro
• Hardware architecture overview & block diagram: docs/ARCHITECTURE.md
• Automated releases produce:
  • Gerber RS-274X drill and layer files (gerbers.zip)
  • Bill of Materials (BOM) in JLCPCB SMT format (bom.csv)
  • Pick and Place Component Centroid coordinates (pos.csv)

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Automated Tag Release

Pushing any semantic version tag (e.g. v0.1.0) triggers .github/workflows/release.yml, executing KiForge in CI to automatically generate and attach production fabrication assets to GitHub Releases.

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License

Hardware schematics and PCB designs are licensed under the MIT License / CERN Open Hardware Licence.