Importing SparkFun Schematic
Thought
I’ll match the SparkFun MAX-M10S breakout’s board size and overall placement: first source the official board dimensions, then resize, place the edge connectors/mounting features, arrange the GNSS/RF and support blocks, and verify overlaps/board-edge issues.
Worked
Resized the PCB to the SparkFun reference dimensions—38.1 × 30.48 mm (1.5 × 1.2 in)—and re-placed all 34 PCB footprints in a similar compact arrangement.
- U1 centered
- SMA connector on the right edge
- Signal header on the left
- Serial header along the bottom
- Qwiic connectors on the top/bottom-left
- Backup battery upper-left
- ANT1 upper-right
- RF components clustered near U1’s RF input
- Small passives moved to the bottom where necessary
- ✅ No component overlaps or pads outside the board
Open items:
- The layout is dense because ANT1 and several additional parts are not present on the original SparkFun board.
- J5’s body intentionally overhangs the left edge slightly.
- The four SparkFun-style mounting holes have not been added.
Suggested next steps:
- Add four 3.3 mm mounting holes at the SparkFun locations.
- Add ANT1’s copper/component keepout.
- Route the RF path first, followed by power and digital signals.
Add holes and keepout
Add mounting holes
Add antenna keepout
Review placement image
Check layout issues
Refine this doc
Ask about this doc
Import Notes — SparkFun u-blox GNSS MAX-M10S
Source schematic: https://cdn.sparkfun.com/assets/f/3/f/b/4/SparkFun_u-blox_GNSS_MAX-M10S_Schematic_v10.pdf
Related official source: https://github.com/sparkfun/SparkFun_u-blox_MAX-M10S
Imported scope
Recreated the SparkFun u-blox GNSS MAX-M10S rev V10 schematic netlist in Flux:
- U1: u-blox MAX-M10S GNSS module
- RF antenna path: SMA edge connector, RF ESD diode, bias tee bead/resistor/capacitor
- Qwiic/I²C connectors and optional pull-up jumper
- UART/control breakout headers
- Backup battery/charge path
- PWR and PPS LEDs with disable jumpers
- MEAS jumper in the FTDI/header 3.3 V feed path
U1 pin-map correction
U1 was remapped/replaced with a corrected local part,
MAX-M10S-00B SparkFun Pinmap, so the active U1 pin numbers now match the SparkFun/u-blox schematic:Table
| Pin | Active U1 signal | Connection |
|---|---|---|
| 1 | GND | GND |
| 2 | TXD | R3 → TXO |
| 3 | RXD | R6 → RXI |
| 4 | EXTINT | R18 → INT |
| 5 | TIMEPULSE | R21 → PPS |
| 6 | D_SEL | GND |
| 7 | V_BCKP | BACKUP |
| 8 | VCC | 3.3V |
| 9 | R19 → RESET | |
| 10 | GND | GND |
| 11 | RF_IN | RF_ANT |
| 12 | GND | GND |
| 13 | GND | GND |
| 14 | VCC_RF | R14 / RF bias filter |
| 15 | GND | GND |
| 16 | SDA | R2 → SDA |
| 17 | SCL | R4 → SCL |
| 18 | R20 → SAFE |
The old imported library MAX-M10S instance was renamed
U1_OLD, disconnected from signal nets, and excluded from BOM/PCB/Pick-and-Place because the remover tool hit a platform error. The active schematic component is U1.Values and source notes
- C1: 47 pF from the Eagle source extraction
- C3: 1.0 uF
- R14: 33 Ω from the Eagle source extraction
- FB2: imported as 2.56 Ω from Eagle source extraction; PDF OCR also reported 2.66 Ω
- D10: PESD0402-140 RF ESD diode; PDF OCR also referred to this as D1, while the Eagle source extraction identifies D10
- I²C address note from schematic: 7-bit unshifted address 0x42
- RF trace note from schematic: 2-layer, 1 oz copper, 1.6 mm board, Er 4.6, 6 mil polygon isolation, RF trace width 39.4 mil / 1.0 mm
Stand-ins / items to swap before exact PCB replication
- B1 uses a small 2-terminal coin-cell retainer stand-in. Original SparkFun package is
ML414H_IV01E/6.8MM_COIN_CELL; swap to an exact part/footprint before layout if board-level mechanical compatibility matters. - D2 uses B5819WS as a close SOD-323 40 V Schottky stand-in for SparkFun's generic
0.5A/40V/420mVdiode. - J1, J3, and J5 use equivalent pin headers rather than SparkFun Eagle library symbols/footprints.
Net mapping highlights
3.3V: U1 VCC, Qwiic/header VCC, D2 anode, PWR jumper, JP5 source, MEAS outputVCC: J1 pin 4 side of the MEAS jumperBACKUP: U1 V_BCKP, B1 positive, C3, R5 outputSDA/SCL: Qwiic and PTH I²C bus after 33 Ω series resistorsTXO/RXI: UART breakout and FTDI-style header side after 33 Ω series resistorsRF_ANT: U1 RF_IN, SMA signal, RF ESD diode, and bias tee bead
Intentional no-connects
- J1 pins 1 and 5 (DTR/CTS positions)
- J5 pin 2
Imported scope
U1 pin-map correction
Values and source notes
Stand-ins / items to swap before exact PCB replication
Net mapping highlights
Intentional no-connects
