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================================================== PROIECT TSC 2026 - InkTime Smartwatch

DINU ALEXANDRA - IOANA 332CC

  1. DIAGRAMA BLOC

se afla in Diagrama-bloc.png


  1. BILL OF MATERIALS (BOM)

Componenta : MCU Model : Nordic nRF52840 Cod JLC : C227306 Datasheet : https://infocenter.nordicsemi.com/pdf/nRF52840_PS_v1.7.pdf

Componenta : Charger Model : TI BQ25180 Cod JLC : C5162464 Datasheet : https://www.ti.com/lit/ds/symlink/bq25180.pdf

Componenta : Fuel Gauge Model : Maxim MAX17048 Cod JLC : C224357 Datasheet : https://datasheets.maximintegrated.com/en/ds/MAX17048-MAX17049.pdf

Componenta : Accelerometer Model : Bosch BMA421 Cod JLC : C281864 Datasheet : https://www.mouser.com/datasheet/2/783/bst-bma421-ds000-1509549.pdf

Componenta : Haptic Driver Model : TI DRV2605L Cod JLC : C137152 Datasheet : https://www.ti.com/lit/ds/symlink/drv2605l.pdf

Componenta : Regulator Model : Richtek RT6160 Cod JLC : C2892336 Datasheet : https://www.richtek.com/assets/product_pdf/RT6160A/DS6160A-02.pdf


  1. DESCRIERE FUNCTIONALITATE HARDWARE

[Sistemul de Putere]

  • Incarcarea bateriei Li-Po se face prin BQ25180
  • Monitorizare curent si temperatura integrata
  • RT6160 stabilizeaza tensiunea la 3.3V
  • Functionare posibila pana la ~2.8V baterie

[Senzori si Interfete]

  • MAX17048:

    • Citire procent baterie prin I2C
    • Fara rezistenta externa de masura
  • BMA421:

    • Detectie miscare
    • Step counting
    • Tilt-to-wake
  • DRV2605L:

    • Control motor vibratii (ERM/LRA)
    • Efecte haptice integrate
  • E-Paper Display:

    • Consum zero in stare statica
    • Control prin SPI

  1. ALOCARE PINI nRF52840

USB D+ / D- | USB Data | USB-C (J5) | | Pini dedicati pentru comunicatia USB nativa

P0.06 | I2C SDA | Senzori / PMIC | | Magistrala date (BMA421, MAX17048, BQ25180)

P0.07 | I2C SCL | Senzori / PMIC | | Magistrala clock pentru comunicatia I2C

P0.02 | SPI SCK | E-Paper Display | | Semnal de ceas pentru magistrala SPI

P0.03 | SPI MOSI | E-Paper Display | | Transmisie date imagine catre ecran

P0.05 | SPI CS | E-Paper Display | | Chip Select - activeaza comunicarea cu ecranul

P0.15 | EPD DC | E-Paper Display | | Data/Command control pentru driverul de ecran

P0.16 | EPD RST | E-Paper Display | | Reset hardware pentru panoul E-Paper

P0.17 | EPD BUSY | E-Paper Display | | Feedback de la ecran (procesare imagine)

P0.12 | HAPTIC EN | DRV2605L | | Activare / Trigger pentru driverul haptic

P0.11 | PMIC INT | BQ25180 | | Intrerupere de la charger

P0.10 | ALERT | MAX17048 | | Alerta baterie (ex: nivel critic)

P0.08 | IMU INT1 | BMA421 | | Intrerupere accelerometru (tap/tilt)

P1.08 | IMU INT2 | BMA421 | | Intrerupere secundara (low power)

P1.06 | BUTTON | SW_UP | | Buton navigare sus

P1.04 | BUTTON | SW_DN | | Buton navigare jos

P0.18 | RESET | Debug Port | | Reset hardware extern

SWDIO | Debug Data | TC2030 (J2) | | Linie date programare

SWDCLK | Debug Clock | TC2030 (J2) | | Linie ceas programare

P0.00 / 0.01 | XL1 / XL2 | Cristal 32kHz | | Oscilator low power / RTC

XC1 / XC2 | HF Crystal | Cristal 32MHz | | Frecventa principala + BLE

VBUS | Power Sense | USB VBUS | | Detectie 5V USB

VDDH | High Voltage | 3.3V VCC | | Alimentare principala


  1. DESIGN LOG SI DECIZII

[Status: Finalizare Partiala]

  • Overlap Errors (#16):

    • 65 erori acceptate
    • Cauza: densitate mare aQFN + PCB 2 straturi
    • Solutie viitoare: PCB 4 straturi
  • Airwires (#15):

    • 16 conexiuni ramase
    • Nu afecteaza functionarea de baza
    • Evitare scurtcircuite in zone critice
  • Antena RF:

    • Ground stitching aplicat
    • Keep-out respectat sub antena
  • Vizualizare 3D:

    • PCB validat mecanic (1.0mm grosime)
    • Fara modele 3D componente

  1. FISIERE DE FABRICATIE

Folder: /Manufacturing

Contine:

  • Gerber Files (pentru productie PCB)
  • BOM (lista componente)
  • Pick and Place (asamblare SMT)

==================================================

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