BOM Component Verification
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Table
| Part Name | Manufacturer Part Number | Quantity | Footprint | Datasheet link | Manufacturer |
|---|---|---|---|---|---|
| NINA-B306-00B | NINA-B306-00B | 1 | Module 10×15 mm | U-blox | |
| BMI270 | BMI270 | 1 | LGA-14 2.5×3.0 mm | Bosch Sensortec | |
| BQ35100PW | BQ35100PW | 1 | TSSOP-14 | ___ | Texas Instruments |
padtonet.csv
| Reference | Pad | Net | Notes | Fit |
|---|---|---|---|---|
| U1 | Pin10_VCC | VBAT | Main supply | FIT |
| U1 | Pin9_VCC_IO | VBAT | I/O supply (use VCC_IO if split) | FIT |
| U1 | Pin6_GND | GND | FIT | |
| U1 | Pin12_GND | GND | FIT | |
| U1 | Pin14_GND | GND | FIT | |
| U1 | Pin26_GND | GND | FIT | |
| U1 | Pin30_GND | GND | FIT | |
| U1 | Pin33_GND | GND | FIT | |
| U1 | Pin39_GND | GND | FIT | |
| U1 | Pin53_GND | GND | FIT | |
| U1 | EGP/EAGP | GND | Exposed ground pads if present | FIT |
| U1 | Pin42_P0.26 | I2C_SCL | FIT | |
| U1 | Pin44_P0.27 | I2C_SDA | FIT | |
| U1 | Pin5_P0.24 | GAUGE_ALERT | FIT | |
| U1 | Pin7_P0.25 | GAUGE_GE | FIT | |
| U1 | Pin8_P0.16 | BMI270_INT1 | FIT | |
| U1 | Pin1_P0.13 | BTN1 | FIT | |
| U1 | Pin2_P0.14 | BTN2 | FIT | |
| U1 | Pin3_P0.15 | LED_STATUS | FIT | |
| U1 | Pin17_P0.28 | BUZZ_PWM | FIT | |
| U1 | Pin11_SWDCLK | SWCLK | FIT | |
| U1 | Pin15_SWDIO | SWDIO | FIT | |
| U1 | Pin19_RESETn | nRESET | FIT | |
| U1 | Pin31_VBUS | VBUS_PAD | Optional factory pad | FIT |
| U1 | Pin54_USB_DP | USB_DP_PAD | Optional factory pad | FIT |
| U1 | Pin55_USB_DM | USB_DM_PAD | Optional factory pad | FIT |
| U2 | Pin_VDD | VBAT | FIT | |
| U2 | Pin_VDDIO | VBAT | FIT | |
| U2 | Pin_GND | GND | FIT | |
| U2 | Pin_GNDIO | GND | FIT | |
| U2 | Pin_SCL | I2C_SCL | FIT | |
| U2 | Pin_SDA | I2C_SDA | FIT | |
| U2 | Pin_CSB | VBAT | Tie high selects I²C mode | FIT |
| U2 | Pin_SDO | GND | 0Ω to GND for addr 0x68 (move to VDDIO for 0x69) | FIT |
| U2 | Pin_INT1 | BMI270_INT1 | FIT | |
| U2 | Pin_INT2 | NC | Leave unconnected | DNP |
| U3 | Pin_BAT | VBAT | FIT | |
| U3 | Pin_REGIN | VBAT | 0.1µF (C6) to GND | FIT |
| U3 | Pin_VSS | GND | FIT | |
| U3 | Pin_SCL | I2C_SCL | FIT | |
| U3 | Pin_SDA | I2C_SDA | FIT | |
| U3 | Pin_ALERT | GAUGE_ALERT | FIT | |
| U3 | Pin_GE | GAUGE_GE | FIT | |
| U3 | Pin_TS | TS_SENSE | FIT | |
| U3 | Pin_REG25 | REG25 | 1µF (C7) to GND | FIT |
| U3 | Pin_SRP | BAT_SENSE | EOS-only: SRP=SRN; tie node to VBAT | FIT |
| U3 | Pin_SRN | BAT_SENSE | EOS-only: SRP=SRN; tie node to VBAT | FIT |
| BH1 | + | VBAT | CR2477 holder positive | FIT |
| BH1 | - | GND | CR2477 holder negative | FIT |
| BAT1 | N/A | N/A | User-replaceable cell; not soldered | SHIP_SEPARATE |
| C3a | 1 | VBAT | 22µF bulk | FIT |
| C3a | 2 | GND | FIT | |
| C3b | 1 | VBAT | 22µF bulk | FIT |
| C3b | 2 | GND | FIT | |
| C3c | 1 | VBAT | 22µF bulk | FIT |
| C3c | 2 | GND | FIT | |
| C3d | 1 | VBAT | 22µF bulk | FIT |
| C3d | 2 | GND | FIT | |
| C3e | 1 | VBAT | 22µF bulk | FIT |
| C3e | 2 | GND | FIT | |
| C3f | 1 | VBAT | 22µF bulk | FIT |
| C3f | 2 | GND | FIT | |
| C2 | 1 | VBAT | 10µF near U1 | FIT |
| C2 | 2 | GND | FIT | |
| C8 | 1 | VBAT | 100nF at BH1 | FIT |
| C8 | 2 | GND | FIT | |
| C1 | 1 | VBAT | 100nF at U1 VCC | FIT |
| C1 | 2 | GND | FIT | |
| C9 | 1 | VBAT | 100nF at U1 VCC_IO (use VCC_IO if split) | FIT |
| C9 | 2 | GND | FIT | |
| C4 | 1 | VBAT | 100nF at U2 VDD | FIT |
| C4 | 2 | GND | FIT | |
| C13 | 1 | VBAT | 1µF at U2 VDD | FIT |
| C13 | 2 | GND | FIT | |
| C5 | 1 | VBAT | 100nF at U2 VDDIO | FIT |
| C5 | 2 | GND | FIT | |
| C14 | 1 | VBAT | 1µF at U2 VDDIO | FIT |
| C14 | 2 | GND | FIT | |
| C6 | 1 | VBAT | 0.1µF at U3 REGIN | FIT |
| C6 | 2 | GND | FIT | |
| C7 | 1 | REG25 | 1µF at U3 REG25 | FIT |
| C7 | 2 | GND | FIT | |
| R3 | 1 | I2C_SCL | SCL pull-up 4.7k | FIT |
| R3 | 2 | VBAT | FIT | |
| R4 | 1 | I2C_SDA | SDA pull-up 4.7k | FIT |
| R4 | 2 | VBAT | FIT | |
| R5 | 1 | BTN1 | BTN1 pull-up 10k | FIT |
| R5 | 2 | VBAT | FIT | |
| R6 | 1 | BTN2 | BTN2 pull-up 10k | FIT |
| R6 | 2 | VBAT | FIT | |
| R1 | 1 | VBAT | LED current limit 470Ω | FIT |
| R1 | 2 | LED_ANODE | FIT | |
| R2 | 1 | BUZZ_PWM | Piezo series 150Ω | FIT |
| R2 | 2 | PIEZO_PLUS | FIT | |
| R7 | 1 | REG25 | TS pull-up 10k | FIT |
| R7 | 2 | TS_SENSE | FIT | |
| R8 | 1 | U2_SDO | 0Ω strap | FIT |
| R8 | 2 | GND | Addr 0x68; move to VDDIO for 0x69 | FIT |
| TH1 | 1 | TS_SENSE | 10k NTC | FIT |
| TH1 | 2 | GND | FIT | |
| D1 | Anode | LED_ANODE | Status LED | FIT |
| D1 | Cathode | LED_STATUS | FIT | |
| SPK1 | + | PIEZO_PLUS | Piezo buzzer + | FIT |
| SPK1 | - | GND | Piezo buzzer - | FIT |
| ESD1 | 1 | BTN1 | TVS at BTN1 entry | FIT |
| ESD1 | 2 | GND | FIT | |
| ESD2 | 1 | BTN2 | TVS at BTN2 entry | FIT |
| ESD2 | 2 | GND | FIT | |
| D4 | 1 | VBAT | Battery TVS | FIT |
| D4 | 2 | GND | FIT | |
| P1 | Pad | VBUS_PAD | Factory VBUS pad | DNP |
| C10 | 1 | VBUS_PAD | 100nF HF bypass for P1 | DNP |
| C10 | 2 | GND | DNP | |
| P2 | Pad | USB_DP_PAD | Factory USB DP pad | DNP |
| D2 | 1 | USB_DP_PAD | USB DP ESD | DNP |
| D2 | 2 | GND | DNP | |
| P3 | Pad | USB_DM_PAD | Factory USB DM pad | DNP |
| D3 | 1 | USB_DM_PAD | USB DM ESD | DNP |
| D3 | 2 | GND | DNP | |
| J1 | Pad1_SWCLK | SWCLK | 2x3 pogo block, row1 col1 | FIT |
| J1 | Pad2_GND | GND | row1 col2 | FIT |
| J1 | Pad3_SWDIO | SWDIO | row2 col1 | FIT |
| J1 | Pad4_VTREF | VTREF | row2 col2 (tie to VBAT near U1) | FIT |
| J1 | Pad5_nRESET | nRESET | row3 col1 | FIT |
| J1 | Pad6_GND | GND | row3 col2 | FIT |
| C11 | 1 | BTN1 | BTN1 debounce 100nF | FIT |
| C11 | 2 | GND | FIT | |
| C12 | 1 | BTN2 | BTN2 debounce 100nF | FIT |
| C12 | 2 | GND | FIT | |
| C15 | 1 | I2C_SCL | Snubber 33–100pF (if needed) | DNP |
| C15 | 2 | GND | DNP | |
| C16 | 1 | I2C_SDA | Snubber 33–100pF (if needed) | DNP |
| C16 | 2 | GND | DNP | |
| C17 | 1 | BMI270_INT1 | Snubber 33–100pF (if needed) | DNP |
| C17 | 2 | GND | DNP |
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