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Romeo-Lorenzo
I decided to mìhave my own take at a quartz watch by using two Miyota 2035 watch movements and a custom made case and PCB.
| Reference | Value | Description |
|---|---|---|
| IC1 | PCF2003DUS | 32 kHz watch circuit with programmable adaptive motor pulse and pulse period |
| IC2 | BMM350 | Board Mount Hall Effect / Magnetic Sensors High-Performance Magnometer |
| IC3 | STM32L011E4Y6TR | MCU 32-bit ARM Cortex M0+ RISC 16KB Flash 1.8V/2.5V/3.3V 25-Pin WLCSP T/R |
| IC4 | TPS22991BRAAR | Power Switch ICs - Power Distribution 5V, 3A, 25mohm load switch with optional output discharge |
| Q3-Q6 | 2N7002KQBZ | N-Channel 60 V 720mA (Ta) 420mW (Ta), 4.2W (Tc) Surface Mount, Wettable Flank DFN1110D-3 |
| U1 |
| Pressure Sensor 4.35PSI ~ 18.13PSI (30kPa ~ 125kPa) Absolute 10-WFLGA |
| C1,C4,C5,C9-C11,C13 | 100n | Unpolarized capacitor |
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| C2,C3,C6,C7,CLPT1,CSPT1 | 1u | Unpolarized capacitor |
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| C8 | 200n | Unpolarized capacitor |
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| C12 | 220n | Unpolarized capacitor |
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| D1 | D | Diode |
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| L1 | 27n | Inductor |
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| L2,L3 | L | Inductor |
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| R1-R3 | 0 | Resistor |
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| R4,R5 | 2k | Resistor |
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| R10,R13-R16 | 100k | Resistor |
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| R17 | 1k | Resistor |
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| R18 | 47k | Resistor |
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| SW5 | SW_MEC_5E | MEC 5E single pole normally-open tactile switch |
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| TP1 | GND_PCF2003 | test point |
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| TP2 | VDD_PCF2003 | test point |
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| TP5 | SWDIO | test point |
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| TP6 | SWCLK | test point |
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| TP7 | NRST | test point |
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| TP14 | B+ | test point |
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| TP15 | B- | test point |
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| Y1 | ABS04W-32.768KHZ-4-D2-T5 | Crystal 0.032768MHz +/-20ppm (Tol) -200ppm/1ppm (Stability) 4pF Flexural 130000Ohm 4-Pin SMD T/R |
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