SparkPNT GPSDO
About the SparkPNT GPSDO PCB
SparkPNT GPSDO is an open source ESP32 PCB design by sparkfun, published on GitHub under the MIT license. It is a 4-layer board measuring 151.9 × 101.6 mm, with 290 components from 75 distinct parts.
Its main chip is the ESP32-WROVER-IE-N16R8, from the ESP32 family. Other key parts include the mosaic-T, CH340C, KSZ8041NL/I, AP7361C-3.3V and REC15E-2405SZ. By type, the board carries 76 capacitors, 59 resistors, 50 test points, 22 jumpers, 19 ICs and 19 diodes.
It belongs with the rf & radio designs in this gallery.
From the project
The SparkFun GNSS Disciplined Oscillator (GNSSDO / GNSSDO+) is a precision time and frequency reference based on the Septentrio mosaic-T GNSS receiver. It features a disciplined 10MHz TCXO / OCXO oscillator, aluminum enclosure, Ethernet, PTP broadcast, data logging, multiple power options, and supports the Fugro AtomiChron timing service.
SparkPNT GNSSDO Design Files =====================================
The files here are the KiCad schematic and PCB design files from SparkFun Electronics.
Main components on the SparkPNT GPSDO
SparkPNT GPSDO bill of materials (BOM)
290 components, 75 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ESP32-WROVER-IE-N16R8 | ESP32-WROVER-E-IE | U1 |
| 1 | mosaic-T | MOSAIC_LGA | U2 |
| 1 | CH340C | SO-16 | U3 |
| 1 | KSZ8041NL/I | QFN-32 | U4 |
| 2 | AP7361C-3.3V | UDFN-8 | U5, U11 |
| 1 | REC15E-2405SZ | REC15E | U6 |
| 1 | Ag9905M | Ag9900M | U7 |
| 7 | 74LVC2T45DC | VSSOP8_SOT765-1 | U8, U9, U10, U12, U14, U15, U16 |
| 1 | SiT5358AI-FS033IT-10.000000 | Ceramic_QFN_5.0x3.2mm-10 | U13 |
| 1 | LMV7219M5 | SOT23-5 | U17 |
| 1 | PCA9306 | VSSOP8_SOT765-1 | U18 |
| 1 | ~ | Jumper_2_NC_Trace | U.1 |
| 2 | ~ | Jumper_2_NC_Trace | A.1, M.1 |
| 1 | MBT3904DW1 | SOT-323 | Q1 |
| 4 | SMA_Edge | SMA_Edge | J1, J3, J8, J12 |
| 2 | USB_C_Receptacle | USB-C_16 | J2, J4 |
| 1 | MagJack_PoE | MagJack_PoE_RJ45 | J5 |
| 1 | microSD | microSD_External_Pin | J6 |
| 1 | Qwiic_Vertical | JST_SMD_1.0mm-4_Vertical | J7 |
| 1 | Screw_Cage_3.5mm-10 | Screw_Cage_3.5mm-10 | J9 |
Show 55 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ~ | Jumper_2_NC_Trace | J.1 |
| 1 | ~ | Jumper_2_NO | P.1 |
| 2 | ~ | Jumper_2_NC_Trace | B.1, E.1 |
| 1 | 6V/2.0A/4.0A | 1210 | F1 |
| 1 | ~ | Jumper_2_NC_Trace | F.1 |
| 3 | ~ | Jumper_2_NO | G.1, N.1, V.1 |
| 1 | ~ | Jumper_2_NO | H.1 |
| 3 | ~ | Jumper_3_NC-2_Trace | JP1, JP14, JP22 |
| 5 | Measure | Jumper_2_PTH_SMD_Combo-NC | JP2, JP3, JP4, JP5, JP6 |
| 13 | ~ | Jumper_2_NC_Trace | JP7, JP8, JP9, JP10, JP11, JP12, JP13, JP16 +5 |
| 1 | ~ | Jumper_2_NO | JP15 |
| 1 | ~ | Jumper_2_NO | K.1 |
| 1 | ~ | Jumper_2_NO | S.1 |
| 8 | Standoff | Standoff | ST1, ST2, ST3, ST4, ST5, ST6, ST7, ST8 |
| 3 | PTH_RA_h7.5mm | Push_PTH_RA_8-020_h7.5mm | SW1, SW2, SW3 |
| 2 | DPDT_Slide_SMD_7.2x3.5mm | Slide_DPDT_SMD_7.2x3.5mm | SW4, SW5 |
| 1 | ~ | Jumper_2_NO | T.1 |
| 50 | PTH | 1x01 | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +42 |
| 1 | RFCMF1220100M4T | RFCMF1220100M4T | TR1 |
| 3 | PESD0402 | C_0402_1005Metric | D1, D15, D17 |
| 3 | DT1042-04SO | SOT23-6 | D2, D3, D6 |
| 4 | BAT60A | SOD-323 | D4, D5, D9, D10 |
| 3 | DF5A5.6LFU | SOT-353 | D7, D13, D14 |
| 1 | SK34A | SMA | D8 |
| 2 | CBI_LED_3mm_YGR | CBI_LED_Triple_3mm_PTH | D11, D12 |
| 2 | BAS16J | SOD-323 | D16, D18 |
| 1 | ~ | Jumper_2_NO | D.1 |
| 2 | 470Ohm | C_0603_1608Metric | L1, L2 |
| 2 | 4.7uH | 1008_2520Metric | L3, L4 |
| 1 | ~ | Jumper_2_NO | L.1 |
| 10 | 10uF | C_0603_1608Metric | C1, C25, C27, C30, C33, C34, C37, C38 +2 |
| 29 | 0.1uF | C_0603_1608Metric | C2, C3, C5, C10, C11, C12, C14, C17 +21 |
| 21 | 2.2uF | C_0603_1608Metric | C4, C13, C16, C18, C24, C31, C39, C41 +13 |
| 3 | 100uF | Panasonic_D | C6, C32, C36 |
| 5 | 1.0uF | C_0603_1608Metric | C7, C8, C20, C21, C22 |
| 1 | 1nF | C_1206_3216Metric | C9 |
| 1 | 100pF | C_0603_1608Metric | C15 |
| 1 | 22uF | C_0603_1608Metric | C29 |
| 1 | 47uF | Panasonic_D | C35 |
| 1 | 33pF | C_0603_1608Metric | C55 |
| 2 | 1.0nF | C_0603_1608Metric | C75, C76 |
| 1 | ~ | Jumper_2_NO | C.1 |
| 10 | 10k | R_0603_1608Metric | R1, R2, R3, R5, R11, R23, R24, R27 +2 |
| 6 | 2.2k | R_0603_1608Metric | R4, R6, R31, R32, R54, R55 |
| 9 | 1k | R_0603_1608Metric | R7, R8, R17, R18, R37, R56, R57, R58 +1 |
| 4 | 5.1k | R_0603_1608Metric | R9, R10, R14, R15 |
| 6 | 470 | R_0603_1608Metric | R12, R13, R38, R39, R40, R42 |
| 5 | 100k | R_0603_1608Metric | R16, R41, R43, R44, R52 |
| 10 | 49.9 | R_0603_1608Metric | R19, R20, R21, R22, R45, R46, R47, R48 +2 |
| 2 | 13k | R_0603_1608Metric | R25, R26 |
| 1 | 33 | R_0603_1608Metric | R30 |
| 3 | 4.7k | R_0603_1608Metric | R33, R34, R35 |
| 1 | 49.9 | R_1206_3216Metric | R36 |
| 1 | 200k | R_0603_1608Metric | R53 |
| 1 | ~ | Jumper_2_NC_Trace | R.1 |
SparkPNT GPSDO design files
The KiCad project lives in the sparkfun/SparkFun_GNSSDO repository on GitHub; these links point at the commit this page was built from.
SparkPNT GPSDO: common questions
What microcontroller does the SparkPNT GPSDO use?
The SparkPNT GPSDO is built around the ESP32-WROVER-IE-N16R8, from the ESP32 family.
How big is the SparkPNT GPSDO PCB?
The SparkPNT GPSDO measures 151.9 × 101.6 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the SparkPNT GPSDO?
290 components, from 75 distinct parts. The full bill of materials is listed on this page.
Where can I download the SparkPNT GPSDO design files?
From the sparkfun/SparkFun_GNSSDO repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the SparkPNT GPSDO design in my own project?
Yes, under the terms of its MIT license, which sparkfun chose for the repository.
Can I test firmware for the SparkPNT GPSDO without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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